File type inspector

Read common file signatures and compare them with the filename extension. Check for double extensions and direction-changing characters locally. This is not a malware scan.

File to inspect

Choose one file up to 32 MiB. Only its first 64 KiB and filename are read. A matching signature does not prove that the whole file is valid or safe.

A name and a signature describe different things

A filename can be changed without changing its contents. This inspector recognises common image, document, archive, media and executable headers, then compares that limited signature with the name. ZIP-based Office documents share the same container signature; their inner format is not verified.

This is not a malware scan

A familiar extension or matching header does not make a file trustworthy. Polyglot files, damaged content and threats inside an otherwise valid document can pass these limited checks. An unknown signature means the format was not recognised.