File
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Linux file Command Online
Run browser-side file(1) detection through libmagic WebAssembly.
Your file is not uploaded. This page runs libmagic in your browser through WebAssembly, and the file stays on your device while detection runs.
Ready.
Browse or drag and drop a file anywhere on the page. Supported browser flags are a practical libmagic subset, not full CLI parity.
file(1) Output
Results will appear here after libmagic finishes.
No file command data yet.
Raw file(1) Output
Results will appear here after libmagic finishes.
Why This Page Exists
The main metadata viewer on exif.tools already does signature checks and parser-based inspection, but it is not the same thing as the Unix file command. This page adds a browser-side libmagic engine for people who specifically want file(1)-style output.
To keep browser memory and responsiveness under control, the page analyzes up to the first 1 MiB of the file, which aligns with libmagic's default bytes limit closely enough for typical file-command use.
Supported Browser Flags
This page accepts a practical subset of the Linux file flags and maps them to libmagic flags in the browser.
Supported here -i, -I, --mime --mime-type --mime-encoding --extension -k, --keep-going -r, --raw -z, --uncompress -Z, --uncompress-noreport -e, --exclude TEST --exclude=TEST --exclude-quiet TEST Ignored because output is already single-file/browser-local -b, --brief -d -n, --no-buffer -N, --no-pad -S, --no-sandbox Not implemented here -m, -M, -f, -F, -P, -C, -D, symlink/device handling and other host-oriented options Reference file --help https://man7.org/linux/man-pages/man1/file.1.html
Credits
The original file command and libmagic project are the reference point for this page. This browser tool uses the WASM wrapper package moshen/wasmagic, which compiles libmagic to WebAssembly.
This page is intended as a browser-side companion to the native command, not a claim of full CLI parity with every host-specific file option.