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Text Tools
大文字小文字変換Switch text between uppercase, lowercase, title case, sentence case and more.camelCase 変換Convert any text or identifier into camelCase.snake_case 変換Convert text into snake_case identifiers.kebab-case 変換Convert text into kebab-case for URLs, CSS classes and CLIs.PascalCase 変換Convert text into PascalCase for class and type names.CONSTANT_CASE 変換Convert text into CONSTANT_CASE for macros and enum members.逆順テキストReverse characters, words or lines of any text.単語カウントCount words, characters, sentences and paragraphs live.文字カウントCount characters with and without spaces, including byte length.行カウントCount lines, empty lines and longest line of pasted text.削除重複行Delete repeated lines while keeping order.並べ替え行Sort lines alphabetically, numerically, by length, ascending or descending.シャッフル行Randomize the order of lines using a cryptographic RNG.空白除去空白文字Remove leading/trailing spaces and tabs from every line.AddPrefix&Suffixto 行Wrap every line with a custom prefix and suffix.行番号付けAdd or remove line numbers on any text block.結合行Join all lines with a custom separator.検索&置換 in テキストSearch and replace text with plain or regular-expression matching.Palindrome チェックCheck if text or numbers read the same backwards.テキスト差分チェックCompare two texts line by line and highlight additions and deletions.ダミー文 Ipsum 生成Generate placeholder paragraphs, sentences or words.ZeroPad 数値Pad numbers with leading zeros to a fixed width.文字列繰り返しRepeat any string or character a given number of times.空白文字クリーンアップCollapse spaces, strip blank lines and normalize line endings.スラッグ生成Turn titles into clean, SEO-friendly URL slugs.Zero-Width 文字 RemoverDetect and strip invisible characters and bidi controls used in Trojan Source attacks.テキストパターン抽出Pull every email, URL, IP, MAC, UUID, hashtag, mention, date or hash out of unstructured text.Levenshtein 距離Edit distance and similarity between two strings, with Damerau and Hamming variants.文字頻度分析Count characters, words, line lengths or n-grams and compute Shannon entropy.単語頻度カウントRank words by frequency with the type/token ratio — useful for keyword density checks.行改行変換Convert between LF, CRLF, CR, NEL and LS, and report the mix currently in the file.AddlinenumbersAdds line numbers to the output.AlternatingCapsAlternating caps, also known as studly caps, sticky caps, or spongecase is a form of text notation in which the capitalization of letters varies by some pattern, or arbitrarily. An example of this would be spelling 'alternative caps' as 'aLConverttoNATOalphabetConverts characters to their representation in the NATO phonetic alphabet.ExpandalphabetrangeExpand an alphabet range string into a list of the characters in that range. e.g. a-z becomes abcdefghijklmnopqrstuvwxyz .From 大文字小文字 Insensitive 正規表現Converts a case-insensitive regex string to a case sensitive regex string (no guarantee on it being the proper original casing) in case the i flag wasn't available at the time but now is, or you need it to be case-sensitive again. e.g. [mM]FromQuotedPrintableConverts QP-encoded text back to standard text. This format is a content transfer encoding common in email messages. e.g. The quoted-printable encoded string hello=20world becomes hello worldGenerate ダミー文 IpsumGenerate varying length lorem ipsum placeholder text.GetAllCasingsOutputs all possible casing variations of a string.IndexofCoincidenceIndex of Coincidence (IC) is the probability of two randomly selected characters being the same. This can be used to determine whether text is readable or random, with English text having an IC of around 0.066. IC can therefore be a sound mLZStringCompressCompress the input with lz-string.MurmurHash3Generates a MurmurHash v3 for a string input and an optional seed inputROT13BruteForceTry all meaningful amounts for ROT13. Optionally you can enter your known plaintext (crib) to filter the result.削除 DiacriticsReplaces accented characters with their latin character equivalent. Accented characters are made up of Unicode combining characters, so unicode text formatting such as strikethroughs and underlines will also be removed.削除 linenumbersRemoves line numbers from the output if they can be trivially detected.削除 whitespaceOptionally removes all spaces, carriage returns, line feeds, tabs and form feeds from the input data. This operation also supports the removal of full stops which are sometimes used to represent non-printable bytes in ASCII output.
Encoding Tools
Base64 エンコードEncode text, JSON, URLs or files to Base64, standard or URL-safe.Base32 エンコードEncode binary-safe text into RFC 4648 Base32.Base58 エンコードEncode numbers and text with Bitcoin-style Base58 alphabet.16 進エンコード(TexttoHex)Convert text into hexadecimal byte representation.Morse Code エンコードTranslate text into Morse code dots and dashes.ROT13 エンコードデコードApply the classic ROT13 letter rotation.ROT47 エンコードScramble printable ASCII with the ROT47 cipher.Caesar 暗号Encrypt or decrypt with a classic shift cipher.Atbash 暗号Apply the Hebrew-alphabet mirror cipher Atbash.NATO Phonetic Alphabet 変換Spell text with Alpha, Bravo, Charlie…Unicode Escape 変換Convert characters to \uXXXX escapes and back.HTML Entity エンコードEscape <, >, &, quotes and non-ASCII into HTML entities.CSS Escape 変換Escape special characters for CSS identifiers and strings.JavaScript 文字列エスケープEscape a string so it is safe inside JavaScript literals.URL エンコードPercent-encode URLs or single query components.データ URI 変換Turn files or text into data: URIs for inline embedding.Base64url エンコードEncode text to URL-safe Base64 using - and _ instead of + and /, with optional padding.Ascii85 エンコードEncode binary data as Ascii85 (Adobe) or Z85 (ZeroMQ), the 25%-overhead alternative to Base64.Punycode IDN 変換Convert internationalised domain names to and from their xn-- ASCII form per RFC 3492.DefangURLTakes a Universal Resource Locator (URL) and 'Defangs' it; meaning the URL becomes invalid, neutralising the risk of accidentally clicking on a malicious link. This is often used when dealing with malicious links or IOCs. Works well when coEscapeSmartCharactersConverts smart (typographic) Unicode characters — e.g. smart quotes, em/en dashes, ellipses, ©, ®, ™, arrows — into their plain ASCII equivalents. Characters with no ASCII mapping (e.g. ☣ ) are handled according to the 'Unmappable characterEscapeUnicodeCharactersConverts characters to their unicode-escaped notations. Supports the prefixes: \u %u U+ e.g. σου becomes \u03C3\u03BF\u03C5FromBase62Base62 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. The high number base results in shorter strings than with the decimal or hexadecimalNormaliseUnicodeTransform Unicode characters to one of the Normalisation FormsParseASN.1hexstringAbstract Syntax Notation One (ASN.1) is a standard and notation that describes rules and structures for representing, encoding, transmitting, and decoding data in telecommunications and computer networking. This operation parses arbitrary A削除 ANSIEscape コードRemoves ANSI Escape Codes.StringsExtracts all strings from the input.ToBase92Base92 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers.ToPunycodePunycode is a way to represent Unicode with the limited character subset of ASCII supported by the Domain Name System. e.g. münchen encodes to mnchen-3yaUnescapestringUnescapes characters in a string that have been escaped. For example, Don\'t stop me now becomes Don't stop me now . Supports the following escape sequences: \n (Line feed/newline) \r (Carriage return) \t (Horizontal tab) \b (Backspace) \f VarIntDecodeDecodes a VarInt encoded integer. VarInt is an efficient way of encoding variable length integers and is commonly used with Protobuf.
Decoding Tools
Base64 デコードDecode Base64 (standard or URL-safe) back to text or bytes.Base32 デコードDecode RFC 4648 Base32 back to text.Base58 デコードDecode Bitcoin-style Base58 strings.16 進デコード(HextoText)Convert hexadecimal bytes back into text.Morse Code デコードTranslate dots and dashes back into readable text.HTML Entity デコードConvert &, ' and named entities back to characters.JavaScript 文字列アンエスケープResolve escape sequences inside JavaScript string literals.URL デコードPercent-decode URLs and query values.Unicode Unescape 変換Turn \uXXXX and \xNN sequences into real characters.Base64url デコードDecode URL-safe Base64 back to text, tolerating missing padding.Ascii85 デコードDecode Ascii85 (Adobe) or Z85 back to the original bytes, handling the z shorthand and padding.Punycode デコードDecode an xn-- internationalised domain name back to Unicode per RFC 3492.
Hash Tools
MD5 ハッシュ生成Compute the MD5 digest of any string.SHA-1 ハッシュ生成Compute the SHA-1 digest of any string.SHA-256 ハッシュ生成Compute the SHA-256 digest — the standard for modern integrity checks.SHA-384 ハッシュ生成Compute the SHA-384 digest of any string.SHA-512 ハッシュ生成Compute the SHA-512 digest of any string.HMAC 生成Create keyed HMAC signatures with SHA-256/384/512.CRC32 チェックサムCalculate the CRC32 checksum of text or files.Adler-32 チェックサムCompute the fast Adler-32 checksum used by zlib.ハッシュ Type 識別Guess which algorithm produced a hash from its length, encoding and character set.CRC-16 計算Compute CRC-16 in six variants: CCITT-FALSE, XMODEM, KERMIT, MODBUS, X.25 and DNP.FNV-1a ハッシュCompute the Fowler-Noll-Vo non-cryptographic hash in 32, 64 or 128 bits.MurmurHash3 計算Compute MurmurHash3 x86_32 or x86_128 with a configurable seed.CRC-16 MODBUS 計算Compute the CRC-16/MODBUS checksum used by RS-485 and industrial PLC protocols.Argon2 ハッシュ生成Hash passwords with Argon2id (or argon2i/argon2d) using the reference wasm implementation — OWASP-grade defaults, adjustable memory/iterations/parallelism, PHC-encoded output that is round-trip verified before it is shown, plus a built-in verifier.Ascon ハッシュAscon-Hash256 produces a fixed 256-bit (32-byte) cryptographic hash as standardised in NIST SP 800-232. Ascon is a family of lightweight authenticated encryption and hashing algorithms designed for constrained devices such as IoT sensors anHAS-160HAS-160 is a cryptographic hash function designed for use with the Korean KCDSA digital signature algorithm. It is derived from SHA-1, with assorted changes intended to increase its security. It produces a 160-bit output. HAS-160 is used inMD4The MD4 (Message-Digest 4) algorithm is a cryptographic hash function developed by Ronald Rivest in 1990. The digest length is 128 bits. The algorithm has influenced later designs, such as the MD5, SHA-1 and RIPEMD algorithms. The security NT ハッシュAn NT Hash, sometimes referred to as an NTLM hash, is a method of storing passwords on Windows systems. It works by running MD4 on UTF-16LE encoded input. NTLM hashes are considered weak because they can be brute-forced very easily with modRIPEMDRIPEMD (RACE Integrity Primitives Evaluation Message Digest) is a family of cryptographic hash functions developed in Leuven, Belgium, by Hans Dobbertin, Antoon Bosselaers and Bart Preneel at the COSIC research group at the Katholieke UniveROR13Computes a ROR13 hash used in API hashing techniques.SHA1The SHA (Secure Hash Algorithm) hash functions were designed by the NSA. SHA-1 is the most established of the existing SHA hash functions and it is used in a variety of security applications and protocols. However, SHA-1's collision resistaSHA2The SHA-2 (Secure Hash Algorithm 2) hash functions were designed by the NSA. SHA-2 includes significant changes from its predecessor, SHA-1. The SHA-2 family consists of hash functions with digests (hash values) that are 224, 256, 384 or 51SHA3The SHA-3 (Secure Hash Algorithm 3) hash functions were released by NIST on August 5, 2015. Although part of the same series of standards, SHA-3 is internally quite different from the MD5-like structure of SHA-1 and SHA-2. SHA-3 is a subsetShakeShake is an Extendable Output Function (XOF) of the SHA-3 hash algorithm, part of the Keccak family, allowing for variable output length/size.SnefruSnefru is a cryptographic hash function invented by Ralph Merkle in 1990 while working at Xerox PARC. The function supports 128-bit and 256-bit output. It was named after the Egyptian Pharaoh Sneferu, continuing the tradition of the Khufu a
Cryptography Tools
AES 暗号化Password-based AES-GCM/CBC encryption using the Web Crypto API.AES 復号Decrypt AES-GCM/CBC payloads produced by the AES Encrypt tool.RSA Key Pair 生成Generate 2048/4096-bit RSA keys and export them as JWK.XOR 暗号Encrypt or decrypt bytes with a repeating XOR key.RC4 暗号化Classic RC4 stream cipher — for study and legacy interop.Vigenere 暗号Polyalphabetic keyword cipher, encrypt and decrypt.Affine 暗号 EncodeThe Affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using simple mathematical function, (ax + b) % 26 , and converted back to a letter.Bcryptbcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher, and presented at USENIX in 1999. Besides incorporating a salt to protect against rainbow table attacks, bcrypt is an adaptive fBifid 暗号 DecodeThe Bifid cipher is a cipher which uses a Polybius square in conjunction with transposition, which can be fairly difficult to decipher without knowing the alphabet keyword.Bifid 暗号 EncodeThe Bifid cipher is a cipher which uses a Polybius square in conjunction with transposition, which can be fairly difficult to decipher without knowing the alphabet keyword.Cetacean 暗号 DecodeDecode Cetacean Cipher input. e.g. EEEEEEEEEeeEeEEEEEEEEEEEEeeEeEEe becomes hiCetacean 暗号 EncodeConverts any input into Cetacean Cipher. e.g. hi becomes EEEEEEEEEeeEeEEEEEEEEEEEEeeEeEEeCipherSaber2 復号CipherSaber is a simple symmetric encryption protocol based on the RC4 stream cipher. It gives reasonably strong protection of message confidentiality, yet it's designed to be simple enough that even novice programmers can memorize the algoCipherSaber2 暗号化CipherSaber is a simple symmetric encryption protocol based on the RC4 stream cipher. It gives reasonably strong protection of message confidentiality, yet it's designed to be simple enough that even novice programmers can memorize the algoDeriveEVPkeyThis operation performs a password-based key derivation function (PBKDF) used extensively in OpenSSL. In many applications of cryptography, user security is ultimately dependent on a password, and because a password usually can't be used diDeriveHKDFkeyA simple Hashed Message Authenticaton Code (HMAC)-based key derivation function (HKDF), defined in RFC5869.DerivePBKDF2keyPBKDF2 is a password-based key derivation function. It is part of RSA Laboratories' Public-Key Cryptography Standards (PKCS) series, specifically PKCS #5 v2.0, also published as Internet Engineering Task Force's RFC 2898. In many applicatioEnigmaEncipher/decipher with the WW2 Enigma machine. Enigma was used by the German military, among others, around the WW2 era as a portable cipher machine to protect sensitive military, diplomatic and commercial communications. The standard set oGenerateDeBruijnSequenceGenerates rolling keycode combinations given a certain alphabet size and key length.16 進 toPEMConverts a hexadecimal DER (Distinguished Encoding Rules) string into PEM (Privacy Enhanced Mail) format.MD2The MD2 (Message-Digest 2) algorithm is a cryptographic hash function developed by Ronald Rivest in 1989. The algorithm is optimized for 8-bit computers. Although MD2 is no longer considered secure, even as of 2014, it remains in use in pubRC2 復号RC2 (also known as ARC2) is a symmetric-key block cipher designed by Ron Rivest in 1987. 'RC' stands for 'Rivest Cipher'. Key: RC2 uses a variable size key. IV: To run the cipher in CBC mode, the Initialization Vector should be 8 bytes longRC2 暗号化RC2 (also known as ARC2) is a symmetric-key block cipher designed by Ron Rivest in 1987. 'RC' stands for 'Rivest Cipher'. Key: RC2 uses a variable size key. You can generate a password-based key using one of the KDF operations. IV: To run tRailFence 暗号 DecodeDecodes Strings that were created using the Rail fence Cipher provided a key and an offsetRailFence 暗号 EncodeEncodes Strings using the Rail fence Cipher provided a key and an offsetSIGABAEncipher/decipher with the WW2 SIGABA machine. SIGABA, otherwise known as ECM Mark II, was used by the United States for message encryption during WW2 up to the 1950s. It was developed in the 1930s by the US Army and Navy, and has up to thiTypexEncipher/decipher with the WW2 Typex machine. Typex was originally built by the British Royal Air Force prior to WW2, and is based on the Enigma machine with some improvements made, including using five rotors with more stepping points and WhirlpoolWhirlpool is a cryptographic hash function designed by Vincent Rijmen (co-creator of AES) and Paulo S. L. M. Barreto, who first described it in 2000. Several variants exist: Whirlpool-0 is the original version released in 2000. Whirlpool-T
JSON Tools
JSON 整形&整形Pretty-print JSON with configurable indentation.JSON 圧縮Strip whitespace to compress JSON payloads.JSON 検証Check JSON syntax and pinpoint the exact error position.JSON 文字列エスケープEscape a string for embedding inside a JSON document.JSON 文字列アンエスケープUnescape a JSON-encoded string value.JSON to CSV 変換Flatten JSON arrays of objects into CSV.JSON to XML 変換Transform JSON structures into XML documents.JSON to YAML 変換Convert JSON into clean, readable YAML.JSON パスクエリExtract values from JSON with dot/bracket path expressions.JSON 差分Compare two JSON documents deep-equal and list every added, removed and changed path.JSONFlattenCollapse a nested JSON object into dotted keys with array indices.JSONUnflattenExpand dotted-key JSON back into nested objects and arrays.JSON Schema 生成Infer a JSON Schema 2020-12 document from a sample, detecting dates, emails, URIs and UUIDs.ExtractAudioMetadataExtract common audio metadata across MP3 (ID3v2/ID3v1/GEOB), WAV/BWF/BW64 (INFO/bext/iXML/axml), FLAC (Vorbis Comment/Picture), OGG (Vorbis/OpusTags), AAC (ADTS), AC3 (Dolby Digital), WMA (ASF), plus best-effort MP4/M4A and AIFF scanning. OParseTLVConverts a Type-Length-Value (TLV) encoded string into a JSON object. Can optionally include a Key / Type entry. Tags: Key-Length-Value, KLV, Length-Value, LV
XML Tools
HTML Tools
CSS Tools
CSS 整形Indent and tidy CSS stylesheets.CSS 圧縮Compress CSS for production.CSSUnit 変換(px,rem,em,%)Convert between px, rem, em, pt and % with a configurable root size.CSS グラデーション生成Build linear and radial gradients visually and copy the CSS.Box 影生成Design box shadows with live preview and copy-ready CSS.CSSBeautifyIndents and prettifies Cascading Style Sheets (CSS) code.
JavaScript Tools
Developer Tools
Cron 数式解析Explain cron syntax and compute the next 10 run times.HTTP ステータス Code 一覧Search all HTTP status codes with meanings and usage notes.User-Agent 解析Break a User-Agent string into browser, engine and OS.ASCII 文字テーブルInteractive reference of all 128 ASCII codes.Unicode 文字一覧Inspect code points, blocks and UTF encodings of any character..gitignore 生成Assemble a .gitignore from curated stack templates.Semver 解析Break a semantic version into major, minor, patch, prerelease and build metadata.SemverCompareCompare two semantic versions by precedence and tell you whether the change is breaking.Semver Range チェックTest whether a version satisfies a ^, ~, >=, < or x-range expression.Snowflake ID デコードDecode a Twitter or Discord snowflake into its timestamp, worker and sequence bits.MongoDB ObjectId デコードExtract the creation timestamp, random bytes and counter from a 24-character ObjectId.MIME Type 一覧Look up the MIME type for a file extension or the extensions for a MIME type, with server config snippets.SemverBumpBump major, minor, patch or any prerelease component with the reset rules applied.Semver 並べ替えSort a list of versions by semver precedence, so 1.10.0 correctly follows 1.9.0.Snowflake ID 生成Generate time-ordered 64-bit snowflake IDs with a configurable worker id and epoch.MongoDB ObjectId 生成Generate valid 24-character ObjectIds with the current timestamp, random bytes and counter.SQL 整形Beautify SQL queries: keywords on new lines with indent, SELECT lists one column per line, subqueries nested, string literals and comments untouched.cURL to Code 変換Paste a curl command and get a ready-to-run JavaScript fetch or Python requests snippet with method, headers and body preserved.GenericCodeBeautifyAttempts to pretty print C-style languages such as C, C++, C#, Java, PHP, JavaScript etc. This will not do a perfect job, and the resulting code may not work any more. This operation is designed purely to make obfuscated or minified code moSQLMinifyCompresses Structured Query Language (SQL) code.SSDEEPSSDEEP is a program for computing context triggered piecewise hashes (CTPH). Also called fuzzy hashes, CTPH can match inputs that have homologies. Such inputs have sequences of identical bytes in the same order, although bytes in between th
Network Tools
DNS 一覧Query A, AAAA, MX, TXT, NS, CNAME and SOA records over DNS-over-HTTPS.ドメイン RDAP WHOIS 一覧Fetch registrar, status and expiry data via RDAP.HTTP Request ヘッダー検査See exactly which headers your client sends.ポート数値一覧Find the service behind a port number, or the port behind a service name, with the IANA class.IP Address 抽出Pull every IPv4 address out of a log file, packet capture summary or config dump, deduplicated.URL 抽出Find and list every http/https URL in unstructured text, one per line, deduplicated.ParseEthernetframeParses an Ethernet frame and either shows the deduced values (Source and destination MAC, VLANs) or returns the packet data. Good for use in conjunction with the Parse IPv4, and Parse TCP/UDP recipes.ParseUDPParses a UDP header and payload (if present).
IP Tools
IPv4 サブネット CIDR 計算Network address, broadcast, wildcard, mask and host range from any CIDR.IPv6 Address 展開Expand abbreviated IPv6 to the full 8-group form.IPv6 Address 圧縮Compress IPv6 to its shortest RFC 5952 form.IP to 10 進変換Convert IPv4 addresses to 32-bit integers and back.10 進 to IP 変換Turn a packed integer back into dotted-quad IPv4.MAC Address 検証Validate MAC formats and inspect unicast/multicast and admin bits.DefangIPAddressesTakes a IPv4 or IPv6 address and 'Defangs' it, meaning the IP becomes invalid, removing the risk of accidentally utilising it as an IP address.FormatMACaddressesDisplays given MAC addresses in multiple different formats. Expects addresses in a list separated by newlines, spaces or commas. WARNING: There are no validity checks.IPv6TransitionAddressesConverts IPv4 addresses to their IPv6 Transition addresses. IPv6 Transition addresses can also be converted back into their original IPv4 address. MAC addresses can also be converted into the EUI-64 format, this can them be appended to your
URL Tools
URL 解析Split any URL into protocol, host, port, path, query and hash.クエリ文字列解析Decode query strings into a readable parameter table.UTM Link 生成Append UTM campaign parameters to any URL.Relative URL 解決Resolve relative links against a base URL.ParseURIPretty prints complicated Uniform Resource Identifier (URI) strings for ease of reading. Particularly useful for Uniform Resource Locators (URLs) with a lot of arguments.
Timestamp Tools
Unix タイムスタンプ変換Convert Unix time to human dates and back, in any timezone.CurrentUnix 時刻Live clock showing Unix time in seconds and milliseconds.タイムスタンプ to 日付変換Turn a timestamp (s/ms/µs) into a formatted date instantly.日付 to タイムスタンプ変換Convert a calendar date & time into Unix epoch seconds.Milliseconds 変換Convert milliseconds to seconds, minutes, hours and days.時刻 Difference 計算Distance between two timestamps or dates in every unit.FromUNIX タイムスタンプConverts a UNIX timestamp to a datetime string. e.g. 978346800 becomes Mon 1 January 2001 11:00:00 UTC A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).
Date & Time Tools
日付 Format 変換Render any date in ISO, RFC, locale and custom formats.DaysBetween 日付Count days (and weeks/months) between two calendar dates.日付 Add Subtract 計算Add or subtract days, weeks, months from a date.タイムゾーン変換Compare times across world timezones instantly.うるう年 Year チェックCheck whether a year is a leap year and why.年齢計算Exact age in years, months, days, hours and total days.ISO 週数値計算Find the ISO-8601 week and weekday of any date.Get 時刻Generates a timestamp showing the amount of time since the UNIX epoch (1970-01-01 00:00:00 UTC). Uses the W3C High Resolution Time API.ParseDateTimeParses a DateTime string in your specified format and displays it in whichever timezone you choose with the following information: Date Time Period (AM/PM) Timezone UTC offset Daylight Saving Time Leap year Days in this month Day of year We
Number Tools
数値 Base 変換Convert integers between bases 2–36.16 進 10 進バイナリ Live 変換Edit hex, dec, oct and bin simultaneously — all stay in sync.Roman Numeral 変換Convert between Roman numerals and Arabic numbers.数値 to Words 変換Spell out numbers in English words (cheques, captions).パーセント計算Percent of, increase/decrease and ratio problems.乱数数値生成Cryptographically random integers in any range.数値整形Thousands separators and fixed decimals for any locale.階乗計算Exact big-integer factorials.GCD&LCM 計算Greatest common divisor and least common multiple of a list.素数数値チェックTest primality and show the smallest factor.ConvertdataunitsConverts a unit of data to another format.ConvertdistanceConverts a unit of distance to another format.Unicode テキスト FormatAdds Unicode combining characters to change formatting of plaintext.
Binary Tools
Hex Tools
Regex Tools
Image Tools
画像 ResizerResize images locally without uploading them.画像 Format 変換Convert PNG ↔ JPEG ↔ WebP in the browser.画像圧縮Re-encode JPEG/WebP with a quality slider and size preview.画像 to Base64 変換Embed images as Base64 data URIs.Base64 to 画像変換Preview and download an image from Base64 data.画像色選択Pick pixel colors from any uploaded image.SVG to PNG 変換Convert SVG to PNG with a transparent or custom background, exact pixel width and up to 8× quality — every file is rasterised by your own browser in seconds, never uploaded, no sign-up and no watermark.SVG to JPG 変換Convert SVG to JPG right in the browser — the background is flattened to white (or any colour you pick), the size follows your request, and the vector file is only ever opened inside your own tab.ScanforEmbedded ファイルScans the data for potential embedded files by looking for magic bytes at all offsets. This operation is prone to false positives. WARNING: Files over about 100KB in size will take a VERY long time to process.
File Tools
ファイル to Base64 変換Encode any local file to Base64 — nothing is uploaded.Base64to ファイル DownloaderDecode Base64 back into the original file.ファイルハッシュチェックMD5/SHA-1/SHA-256/SHA-512 of any file, computed locally.ファイル MetadataViewerInspect name, MIME type, size and modification time.ファイル to ZIP パッケージャBundle multiple files into a ZIP archive locally.Magic バイト識別Identify a file type from its signature bytes rather than its extension — the safe way to validate uploads.ZIP 抽出Preview and unpack any ZIP file right in your browser — list every entry, view text and images inline, download files one by one, and the archive is never uploaded.テキスト to DOCX 変換Paste plain text and download a real Word .docx — paragraphs, UTF-8 and escapes are assembled into minimal OOXML in your browser and verified by reading the file back before download. Nothing is uploaded.TXT to DOCX 変換Drop or paste a .txt file and get a .docx Word, WPS or Pages can open — plain-text paragraphs preserved exactly, emoji and & < > included, built and read back locally in this tab.Markdown to DOCX 変換Turn a Markdown note into a .docx — headings and bullets cross over as literal text on purpose: this builds an honest minimal Word document locally, not a styled clone, and your note is never uploaded.DOCX to テキスト変換Drop a .docx Word file and get its plain text out — copied to the clipboard or downloaded as .txt — extracted and verified entirely in your browser, never uploaded. Macro documents, password-protected files and legacy .doc are refused, not converted.Detect ファイル TypeAttempts to guess the MIME (Multipurpose Internet Mail Extensions) type of the data based on 'magic bytes'. Currently supports the following file types:ファイル TreeCreates a file tree from a list of file paths (similar to the tree command in Linux)
Compression Tools
Gzip 圧縮Gzip text and download the .gz or inspect Base64.Gzip 解凍Inflate gzip payloads from files or Base64.Deflate 圧縮Raw DEFLATE compression in the browser.Deflate 解凍Inflate raw DEFLATE data.Brotli 圧縮Compress text with Brotli (RFC 7932) directly in your browser — the same codec Google ships, compiled to WebAssembly, quality 0–11, Base64 or Hex output with exact size statistics.Brotli 解凍Paste Base64 or Hex brotli data and get the original text back — real RFC 7932 decompression in WebAssembly, binary payloads detected and re-encoded, nothing uploaded.Bzip2CompressBzip2 is a compression library developed by Julian Seward (of GHC fame) that uses the Burrows-Wheeler algorithm. It only supports compressing single files and its compression is slow, however is more effective than Deflate (.gz & .zip).
Data Conversion Tools
CSV to JSON 変換Turn CSV (or any delimited file) into a JSON array.YAML to JSON 変換Parse YAML configuration into JSON.HTML to Markdown 変換Convert HTML fragments into Markdown.JSON to TOML 変換Convert JSON config into TOML format.Markdown to HTML 変換Render Markdown to clean HTML.Delimiter 変換Switch CSV between comma, tab, semicolon and pipe.JSONtoJSON 行Turn a JSON array into newline-delimited NDJSON, one standalone object per line.JSON 行 toJSONMerge newline-delimited JSON records back into one array and report any malformed line by number.JSONtoTypeScriptGenerate TypeScript interfaces from a JSON sample, including nested objects and arrays.JSONtoGoStructGenerate a Go struct with json tags from a JSON sample.JSONtoPythonDataclassGenerate a typed Python dataclass from a JSON sample.JSONtoSQLCREATETABLEInfer column types from JSON and emit a CREATE TABLE statement.CSVtoMarkdown テーブルConvert CSV into a GitHub-flavoured Markdown table, handling quoted fields and pipes.Markdown テーブル toCSVTurn a Markdown table back into clean CSV with proper quoting.CSVPrettyPrinterAlign CSV columns into a readable fixed-width table for terminals and docs.CSVtoHTML テーブルGenerate an accessible HTML table from CSV with escaped cells.CSVtoSQLINSERTProduce INSERT statements from CSV or JSON, with NULLs and quoted literals handled.CSVtoCREATETABLEInfer column types from CSV data and emit a CREATE TABLE for PostgreSQL, MySQL or SQLite.INItoJSONParse INI sections and key/value pairs into a structured JSON object.JSONtoINISerialise a JSON object into an INI file with sections for nested objects..envtoJSONParse dotenv files — comments, export prefixes, quoting and inline hashes — into JSON.JSONto.envFlatten JSON into UPPER_SNAKE dotenv variables with correct quoting.JavaPropertiestoJSONConvert .properties files into JSON, splitting dotted keys into nested objects.JSONtoJavaPropertiesFlatten JSON into dotted Java .properties keys.JSONtoJavaRecordGenerate a Java record with boxed types and snake_case field names from a JSON sample.JSONtoRustStructGenerate a serde-derived Rust struct with rename attributes from a JSON sample.JSONtoKotlin データ ClassGenerate a Kotlin data class with nullable-aware types from a JSON sample.
Security Tools
Strong パスワード生成Crypto-random passwords with full policy control.パスフレーズ生成Diceware-style memorable passphrases.パスワード Strength テストEstimate entropy and crack-time of a password.API Key 生成Random hex / Base64 secrets of any length.基本 Auth Header 生成Build and decode Authorization: Basic headers.JWT デコードInspect JWT header, payload and signature metadata.チェックサム検証Compare a file hash against the published digest.Secret スキャンFind leaked API keys, tokens, private keys, JWTs and connection strings in config files, logs or code.PII 秘匿化Mask emails, phone numbers, SSNs, card numbers, IPs, IBANs, MACs and JWTs in logs before sharing them.TOTP Code 生成Generate RFC 6238 time-based one-time passwords from a Base32 secret, with the otpauth URI.JWT 署名検証Decode a JWT and verify its HS256 signature locally, with exp/nbf/iat claim checks.EXIFRemoverRemove EXIF, GPS location, camera info, IPTC and comments from JPG, PNG and WebP photos in one batch — every cleaned file is re-parsed in your browser to prove zero metadata remains, and your photos are never uploaded.JWT 生成Sign and verify JSON Web Tokens entirely in your browser — HS256, HS384, HS512, RS256 and ES256 run on your own WebCrypto, fresh RSA-2048/EC P-256 pairs export as PKCS#8 and SPKI PEM, exp/iat come back as human dates, and the unsigned "none" algorithm is refused by design. Nothing is uploaded.JWTSignerSeal a payload with RS256 (or HS256/HS384/HS512 and ES256) right in the browser: paste claims and a PKCS#8 private key — or generate an RSA/EC pair on the spot — then verify the result on the same page. "none" is never accepted, and your keys never leave this machine.ToBech32Bech32 is an encoding scheme primarily used for Bitcoin SegWit addresses (BIP-0173). It uses a 32-character alphabet that excludes easily confused characters (1, b, i, o) and includes a checksum for error detection. Bech32m (BIP-0350) is an
UUID Tools
UUID 生成Random RFC 4122 v4 UUIDs, bulk generation included.UUID v7 生成Time-ordered sortable UUIDs for databases.ULID 生成26-character lexicographically sortable unique IDs.GUID 生成Microsoft-style bracketed GUIDs.UUID 検証Validate a UUID/GUID and detect its version & variant.GenerateallchecksumsGenerates all available checksums for the input.GenerateUUIDGenerates an RFC 9562 (formerly RFC 4122) compliant Universally Unique Identifier (UUID),
Color Tools
16 進色選択Interactive picker with HEX, RGB and HSL output.色 Code 変換Convert between HEX, RGB, HSL and named colors.色コントラストチェック(WCAG)Verify text contrast ratios against WCAG AA/AAA.色パレット生成Shades, tints and complementary schemes from one color.乱数色生成Batch random colors with copyable codes.CSS 名前付き色リファレンスAll 148 CSS color names with codes and previews.色混色Blend two colours in sRGB, HSL or perceptual CIE Lab and generate a ramp with contrast ratios.CMYK 変換Convert between HEX/RGB/HSL and CMYK for print, in both directions.CMYKtoRGBConvert print CMYK percentages back to screen HEX, RGB and HSL.ParsecolourcodeConverts a colour code in a standard format to other standard formats and displays the colour itself. Example inputs #d9edf7 rgba(217,237,247,1) hsla(200,65%,91%,1) cmyk(0.12, 0.04, 0.00, 0.03)
Web Tools
HTML メタ Tag 生成Build title, description, OG and Twitter card tags.robots.txt 生成Compose a correct robots.txt with sitemaps and rules..htaccess Redirect 生成301/302 redirect and HTTPS-force snippets.JSON-LD Structured データ生成Create schema.org JSON-LD for articles, products and FAQs.メール AddressObfuscatorEncode emails to defeat scrapers.ファビコン生成Render text or color into a real .ico file locally.Content-Security-Policy 生成Build a CSP header for nginx, Apache or HTML, with warnings about unsafe-inline and unsafe-eval.CORS Header 生成Generate correct CORS headers and preflight handling for nginx, Express, Apache, PHP or a Cloudflare Worker.CORS ヘッダー forExpressGenerate correct Express CORS middleware with an explicit origin allow-list and preflight handling.CORS ヘッダー forApacheGenerate Apache mod_headers CORS configuration with OPTIONS preflight rewriting.
Unit Converters
長さ変換Convert metres, kilometres, centimetres, inches, feet, yards, miles and nautical miles.重さ変換Convert kilograms, grams, tonnes, pounds, ounces, stones and carats.温度変換Convert Celsius, Fahrenheit, Kelvin and Rankine with the formulas shown.体積変換Convert litres, millilitres, US and imperial gallons, cups, pints, quarts and fluid ounces.速度変換Convert km/h, mph, metres per second, knots, feet per second and Mach number.面積変換Convert square metres, hectares, acres, square feet, square inches and square miles.圧力変換Convert pascbar, psi, atm, torr, mmHg, kgf/cm² and inches of mercury.エネルギー変換Convert joules, kilowatt-hours, calories, kilocalories, BTU, electronvolts and tonnes of oil equivalent.電力変換Convert watts, kilowatts, mechanical and metric horsepower, BTU/h and kcal/h.角度変換Convert degrees, radians, gradians, arcminutes, arcseconds and turns.時刻期間変換Convert nanoseconds to centuries: seconds, minutes, hours, days, weeks, months and years.データストレージ変換Convert bits, bytes and SI versus IEC multiples — kB, MB, GB, KiB, MiB, GiB, TiB.Typography Unit 変換Convert CSS px, pt, pc, mm, cm, in, Q and didot/cicero at the standard 96 dpi reference.頻度変換Convert hertz, kilohertz, megahertz, gigahertz, RPM and radians per second.データ Rate 変換Convert bandwidth between bit/s, kbit/s, Mbit/s, Gbit/s and byte-per-second units including IEC multiples.Force 変換Convert newtons, kilonewtons, dynes, kilogram-force, pound-force, ounce-force, poundals and kips.Torque 変換Convert newton-metres, kgf·m, kgf·cm, lbf·ft, lbf·in, ozf·in and dyne-centimetres.Density 変換Convert kg/m³, g/cm³, g/mL, lb/ft³, lb/in³ and tonnes per cubic metre.Radiation Dose 変換Convert gray, rad, sievert and rem including milli and micro prefixes.Viscosity 変換Convert dynamic viscosity between Pa·s, mPa·s, centipoise, poise and lbf·s/ft².Luminance 変換Convert cd/m², nits, lamberts, foot-lamberts, stilbs and cd/cm².Illuminance 変換Convert lux, kilolux, phot, foot-candles and lumens per square foot.ConvertareaConverts a unit of area to another format.ConvertmassConverts a unit of mass to another format.ConvertspeedConverts a unit of speed to another format.
Math & Statistics
統計計算Mean, median, mode, range, variance, standard deviation, standard error, quartiles and IQR from a list of numbers.パーセンタイル計算Compute any percentile of a data set with linear interpolation, plus all deciles.相関計算Pearson and Spearman correlation, r², and the least-squares regression line for paired data.組合せ計算C(n,r) with exact BigInt arithmetic and a list of the actual combinations for small inputs.順列計算P(n,r) ordered arrangements computed exactly with BigInt — no floating point rounding.素数 Factorization 計算Break any integer into prime factors and list every divisor with the divisor count.素数数値チェックTest whether a number is prime and, if not, show its smallest divisors and divisor count.PrimesUpToNList every prime number up to a limit, with the count.Math 数式計算Evaluate arithmetic expressions with correct precedence, powers, factorials, functions and constants.分数計算Simplify fractions, convert decimals to exact fractions and add, subtract, multiply or divide them.10 進 to 分数Convert any decimal to its exact simplest fraction using continued-fraction search with a tolerance.AddandSubtractFractionsAdd, subtract, multiply or divide fractions with the common denominator and GCD reduction shown.DropbytesCuts a slice of the specified number of bytes out of the data. Negative values are allowed.MeanComputes the mean (average) of a number list. If an item in the string is not a number it is excluded from the list. e.g. 0x0a 8 .5 .5 becomes 4.75RotateleftRotates each byte to the left by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.RotaterightRotates each byte to the right by the number of bits specified, optionally carrying the excess bits over to the next byte. Currently only supports 8-bit values.
Validators & Checksums
Card 数値検証Validate a card or IMEI with the Luhn algorithm, detect the brand and derive the missing check digit.ISBN 検証Check ISBN-10 and ISBN-13 check digits and compute the correct one for a truncated ISBN.Barcode Check Digit 検証Validate EAN-8, EAN-13, UPC-A and ITF-14 barcodes and see the weighted sum step by step.IBAN 検証Validate an IBAN with MOD-97, check the national length and show the rearranged calculation.SWIFT BIC 検証Check an ISO 9362 BIC and split it into institution, country, location and branch codes.VIN チェックValidate a 17-character vehicle VIN check digit and decode region, year and plant positions.Mod-11 Check Digit 検証Validate ISSN, ISMN, ORCID and other mod-11 identifiers, with the weighted sum shown.LEI 検証Validate an ISO 17442 Legal Entity Identifier with the ISO 7064 MOD 97-10 scheme.Verhoeff Check 検証Apply the Verhoeff dihedral-group checksum that catches all single-digit and all transposition errors.Damm Check 検証Run the Damm quasigroup checksum, which detects every single-digit error and adjacent transposition.Latitude Longitude 変換Convert between decimal degrees and degrees-minutes-seconds, with hemisphere and UTM zone hints.CaretM-decodeDecodes caret or M-encoded strings, i.e. ^M turns into a newline, M-^] turns into 0x9d. Sources such as `cat -v`. Please be aware that when using `cat -v` ^_ (caret-underscore) will not be encoded, but represents a valid encoding (namely thFletcher-16 チェックサムThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties Fletcher-32 チェックサムThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties Fletcher-64 チェックサムThe Fletcher checksum is an algorithm for computing a position-dependent checksum devised by John Gould Fletcher at Lawrence Livermore Labs in the late 1970s. The objective of the Fletcher checksum was to provide error-detection properties
QR Code Tools
QR コード生成Create QR codes for text, URLs, Wi-Fi, vCard, email, phone, SMS, geo, calendar, WhatsApp, Telegram, Bitcoin, Ethereum, UPI and JSON, with error correction, quiet zone, colours and PNG/SVG export.URL QR コード生成Turn any link into a scannable QR code, adding https:// when the scheme is missing and warning about unsafe schemes.Wi-Fi QR コード生成Build a standards-compliant WIFI: payload with SSID, password, WPA/WEP/open encryption and hidden-network flag so phones join the network on scan.vCard QR コード生成Generate a vCard 3.0 contact QR code with name, organisation, title, phone, email, website, address and note.MECARD QR コード生成Build a MECARD contact payload — the compact alternative to vCard that fits in a smaller, lower-version QR symbol.メール QR コード生成Create a mailto: QR code with prefilled recipient, subject and body.Phone 数値 QR コード生成Generate a tel: URI QR code that opens the dialler with the number already filled in.SMS QR コード生成Build an sms: URI QR code with a prefilled message body, encoded for both iOS and Android.Geo Location QR コード生成Create a geo: URI QR code from latitude and longitude, validating the coordinate ranges before encoding.Calendar Event QR コード生成Generate an iCalendar VEVENT QR code with start, end, title, location and description that phones add straight to the calendar.WhatsApp QR コード生成Build a wa.me link QR code with an optional prefilled message, normalising the phone number to digits with country code.Telegram QR コード生成Create a t.me link QR code that opens a Telegram chat or channel.Bitcoin Payment QR コード生成Build a BIP-21 bitcoin: URI QR code with address, amount, label and message, and check the address shape.Ethereum Payment QR コード生成Generate an EIP-681 ethereum: URI QR code with address, value and gas limit, validating the 0x + 40 hex format.UPI Payment QR コード生成Build a upi://pay QR code with payee VPA, name, amount, note and currency, validating the VPA and amount formats.JSON QR コード生成Validate and minify JSON before encoding it, so the payload fits in the smallest possible QR version.QR コードデコードUpload a PNG, JPG, WebP or GIF and decode the QR code locally with jsQR, then identify the payload type and parse its fields.QRPayloadTypeDetectorIdentify what a decoded QR payload actually is — URL, Wi-Fi, vCard, MECARD, geo, calendar, email, phone, SMS, Bitcoin, Ethereum, UPI, WhatsApp, Telegram, JSON, XML or plain text — and split it into fields.QR コード検証Check a payload before you print it: capacity at the chosen error correction level, URL/email/Wi-Fi/vCard/geo/Bitcoin/Ethereum/UPI/JSON format, unsafe schemes and scannability risks.QR Payload 解析Split a raw QR payload into its component fields — Wi-Fi SSID and encryption, vCard name and phone, geo coordinates, URI query parameters.QR Payload 整形Build a correct standard payload string from JSON fields, applying the escaping rules each format requires.QR コード ScanTestRender your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict.GenerateQR コードGenerates a Quick Response (QR) code from the input text. A QR code is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that con
Spreadsheet Tools
Excel to JSON 変換Convert an .xlsx, .xlsm or .xls workbook to JSON in your browser — a lossless table dump of the first sheet (header row included), a live preview of every sheet, correct UTF-8, and the file is never uploaded.Excel to CSV 変換Convert an .xlsx, .xlsm or .xls workbook to RFC 4180 CSV with correct UTF-8 — commas and quotes are escaped by doubling, every sheet is previewed, no upload and no sign-up.CSV to XLSX 変換Paste CSV, TSV, semicolon or pipe text and download a real .xlsx — quotes, CRLF and UTF-8 handled, delimiters auto-sniffed (TAB ; , |) or set by hand, decimal commas preserved, nothing uploaded.JSON to XLSX 変換Paste a JSON array of objects or rows and get a real .xlsx — header from the key union, numbers stay numeric, mixed shapes are refused not guessed, all in your browser.
PDF Tools
PDF 結合ツールMerge two or more PDF files into one document — pages keep their original size and quality, the order follows your selection, and everything runs in your browser: no upload, no sign-up, nothing ever leaves your machine.画像 to PDF 変換Convert JPG and PNG images into a single PDF in your browser — every photo becomes a page in the order you picked them, original resolution is kept, and nothing is uploaded: no account, no queue, no size games.Photo to PDF スキャンTurn phone photos into a clean scanned-style A4 PDF — up to 30 images are centered and fitted onto uniform pages automatically, and the whole scan runs locally like a scanner app without ever uploading a photo.PDFRotatorRotate PDF pages in your browser — turn every page, or just the ones you name (like 1,3-5), 90° either way or upside down, with no re-encoding, no upload and no sign-up. Password-protected PDFs are not supported.逆順 PDFPagesFlip a PDF end to end — the last page becomes page 1 and vice versa, no page content is re-encoded, and the whole reorder runs locally in your browser with no upload and no sign-up.PDF to テキスト変換Convert a PDF to text in your browser — every page is parsed locally with pdf.js, lines come out in reading order, and you get word and character counts plus a .txt download. No upload, no sign-up; scans (no OCR) and password-protected files are declined, and layout is not preserved.Extract テキスト fromPDFExtract the text out of a PDF in one tab: click or drop your file and pdf.js pulls every selectable line locally — the document itself never leaves your machine. Per-page failures degrade to a placeholder instead of killing the run.PDF テキスト抽出A local PDF text extractor: open the file with the pdf.js engine right in this page, copy the plain text or download it as .txt, with page/word/character counts shown up front. Image-only scans and encrypted files are declined up front — this tool is honest about what it reads.PDF to 単語変換Convert a PDF to a Word (.docx) file in your browser: pdf.js reads the selectable text, then a minimal reflowed Word document is assembled paragraph by paragraph — counts up front, copy and download included, no upload and no sign-up. Fonts, images and page layout from the original are not carried across (this is an honest text rebuild), scans get no OCR, and password-protected PDFs are declined.PDF to DOCX 変換Turn a PDF into a .docx you can keep editing: the text is extracted locally with the same pdf.js engine as our PDF text tools and rebuilt as clean Word paragraphs with the same builder as our Text to Word page. Reflowed plain text on purpose — not a pixel-faithful conversion; dense scans (no OCR), encrypted files and documents past the size gates are declined honestly, and nothing is ever uploaded.
Barcode Tools
Barcode 生成Create CODE 128, EAN-13, UPC-A, CODE 39, ITF, Codabar and MSI barcodes from any text or number, with size, colours, quiet zone and crisp SVG or PNG export.EAN-13 Barcode 生成Generate a retail EAN-13 barcode from 12 digits — the 13th check digit is computed for you — and export it as SVG or PNG.UPC-A Barcode 生成Generate a US retail UPC-A barcode from 11 digits with the check digit added automatically, ready for print as SVG or PNG.Code 128 Barcode 生成Encode full ASCII text, serial numbers and tracking codes in the compact, high-density Code 128 symbology with automatic subset switching.Code 39 Barcode 生成Create industrial Code 39 barcodes from letters, digits and - . $ / + % — the wide, rugged symbology used on asset and inventory labels.