How to use: Password Strength Tester

Password Strength Tester is a free online Security Tools tool that estimate entropy and crack-time of a password instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.

Use Password Strength Tester now →

Description

Estimate entropy and crack-time of a password.

  • Security Tools
  • Because everything is computed client-side, Password Strength Tester is safe to use with sensitive data such as API keys, tokens or private logs.
Input Password Strength Tester Output Runs 100% in your browser — your data never leaves your device.
Password Strength Tester — Input → Output

How to use

Using Password Strength Tester takes three steps:

  1. Paste your data into the input box (or load the example).
  2. Configure the options to match your target format or scenario.
  3. Copy, download or inspect the output — it updates live as you type.
How to use · Password Strength Tester 1 Paste your data intothe input box (or loadthe example). 2 Configure the optionsto match your targetformat or scenario. 3 Copy, download orinspect the output —it updates live as youtype.
How to use

Run

Examples

Entropy estimate.

Input

Tr0ub4dor&3

Output

Password length: 11
Character pool: 95
Entropy: ~72 bits
Verdict: STRONG

Time to crack (average):
  Online attack (10/s)         7487.3 billion years
  Offline fast hash (1e10/s)   7k years
  Offline slow hash (1e6/s)    74.9 million years

Checklist:
  ✓ At least 8 characters
  ✗ 12+ characters (recommended)
  ✓ Mixed case
  ✓ Contains a digit
  ✓ Contains a symbol
  ✓ No 3+ repeated characters
  ✓ Does not start with a common pattern
  ✓ Not a single character class (unless very long)

Tip: a 4+ word passphrase (see Passphrase Generator) beats a short complex password.

This output was produced by actually running the tool, not written by hand.

Use cases

Common situations where Password Strength Tester helps:

  • Estimate entropy and crack-time of a password.

Parameters

This tool has no options — it works on the input alone.

FAQ

What is Password Strength Tester?

Password Strength Tester estimate entropy and crack-time of a password. It runs entirely in your browser, so your data stays private.

Is Password Strength Tester free to use?

Yes. Password Strength Tester is free, unlimited and works without registration or installation.

Does my data get uploaded?

No. All processing happens locally in your browser; nothing is sent to any server.

Good to know

  • Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.

Related tools

Strong Password GeneratorCrypto-random passwords with full policy control.Passphrase GeneratorDiceware-style memorable passphrases.API Key GeneratorRandom hex / Base64 secrets of any length.Basic Auth Header GeneratorBuild and decode Authorization: Basic headers.JWT DecoderInspect JWT header, payload and signature metadata.Checksum VerifierCompare a file hash against the published digest.

Password Strength Tester → · Security Tools →

Use Password Strength Tester now →