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File signature and MIME inspector
Inspect file header bytes and compare the declared MIME hint.
Any file
JSON
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Choose a local file up to 256 MiB.
- Run the tool to inspect its first 8 KiB and compare supported signatures with its declared MIME hint.
- Review or download the JSON report; it is not a complete format validation or malware scan.
Examples
PNG header 89 50 4E 47 0D 0A 1A 0A → PNG signature
Limitations
Files up to 256 MiB; only the first 8 KiB are inspected.
Not a complete format validator or malware scan.
ZIP and ISO media containers may represent several formats.
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