← Identify a file

Magic bytes: file signature table

The 220 signatures the file identifier matches against, sorted by byte sequence.

This page lists, as a plain table, the signature records behind the identify tool. Each row is one record from the identifier's public signature data at /assets/signatures.json — the same file that tool loads before you pick anything. Nothing is read or uploaded on this page.

How to read a row

The signature is the fixed byte prefix a file of that format starts with. A file is matched when its first bytes reproduce a signature exactly, longest signature first. Several rows share the same bytes — the ZIP-based packages in particular — which is why the identifier falls back to the file's extension as a tiebreaker. For background on any row, follow its format link.

Where these records come from

One row per record in /assets/signatures.json, rendered unchanged: hex signature, format name, extensions and MIME type. Source: Wikipedia “List of archive formats”, Library of Congress Digital Formats registry, IANA media-type registry, 7-Zip project docs.