How to use: Magic Bytes Identifier
Magic Bytes Identifier is a free online File Tools tool that identify a file type from its signature bytes rather than its extension — the safe way to validate uploads 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 Magic Bytes Identifier now →
Description
Identify a file type from its signature bytes rather than its extension — the safe way to validate uploads.
- File Tools
- Because everything is computed client-side, Magic Bytes Identifier is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using Magic Bytes Identifier takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Run
Examples
The PNG signature followed by the start of its IHDR chunk.
Input
89504E470D0A1A0A0000000D49484452
Output
Bytes: 89 50 4E 47 0D 0A 1A 0A ASCII: .PNG.... Detected: PNG image Signature matched: 89504E470D0A1A0A → PNG image Detection is by file signature, not by extension — this is how servers should validate uploads, since a client can rename anything to .png.
This output was produced by actually running the tool, not written by hand.
Use cases
Common situations where Magic Bytes Identifier helps:
- Identify a file type from its signature bytes rather than its extension — the safe way to validate uploads.
Parameters
This tool has no options — it works on the input alone.
FAQ
What is Magic Bytes Identifier?
Magic Bytes Identifier identify a file type from its signature bytes rather than its extension — the safe way to validate uploads. It runs entirely in your browser, so your data stays private.
Is Magic Bytes Identifier free to use?
Yes. Magic Bytes Identifier 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.