BROWSER-LOCAL TOOLS
File Header Analyzer
Identify supported file headers in your browser. Choose a file to inspect evidence in a separate workbench; nothing is uploaded.
Drop one file here
Inspect its header locally. The file is never uploaded.
Any file size for header analysis · SHA-256 up to 32 MiB
EXAMPLE RESULT
What the analyzer reports
- Detected format
- PNG image
- Extension
- .png
- MIME type
- image/png
- Header
89 50 4E 47 0D 0A 1A 0A- Match evidence
- Strong signature match
Your result may also flag a filename/header conflict or report that no supported signature matched.
RULE SET m3.1-v1
Supported header signatures
The analyzer recognizes these reviewed signature families. Files outside this list remain unknown unless a reviewed filename or MIME hint applies.
- PNG — .png
- GZIP — .gz, .gzip
- GLB — .glb
- ZIP container — .zip, .epub, .3mf, .docx, .xlsx
- PDF — .pdf
- OpenType / TrueType outlines — .ttf, .otf
- OpenType / CFF outlines — .otf
- WOFF2 — .woff2
EPUB, 3MF and Office files can match the ZIP signature, but the analyzer reports only the container and does not inspect or decompress inner contents.
- One file at a time
- 64 KiB header limit
- Optional SHA-256 up to 32 MiB
- Not a malware scan
- Free
- Online
- No installation
- No signup
- Browser-based
- Files stay on your device
- Header evidence
- Conflict reporting
- Optional SHA-256