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File Signature Checker
Upload a file to inspect its header bytes and match them against common file signatures.
Inspect the first bytes of a file and match them against common file signatures.
File Signature Checker
Drag and drop your file here.
Results will appear here
Choose a file to see the result.
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What this tool checks
Use this page when you want a low-level format check beyond the file name and MIME type.
- It reads the first bytes of the file, shows them as hex, and compares them with a built-in signature list.
- This is useful when the extension looks wrong or you want a second format check.
For many common files, the file stays on your device while the tool runs. No account is required.
How to use it
- 1Upload the file
- 2Review the header bytes and matched signature
- 3Use the result together with the MIME type and extension
What the results show
- A matched signature increases confidence that the file really belongs to that format family.
- An unknown signature does not automatically mean the file is unsafe. It may simply be a format outside the current detector list.
Key terms
Frequently asked questions
Is a signature check enough to trust a file?
No. It is a useful signal, but not a complete safety or authenticity check.
What file formats does this tool support?
File Signature Checker works with: Common images, PDFs, ZIP packages, Office containers, MP3, WAV, FLAC, OGG, MP4/MOV, WebM/Matroska, AVIF, HEIC/HEIF, BMP, ICO, TIFF, and SVG/XML headers.
What is this tool used for?
Use it for: Check a suspicious extension, Confirm that a file header matches expectations and Pair low-level signature data with MIME inspection.