any file type · reads the real content, not the name · batch · no upload · no signup
Reads the first bytes of a file — its signature, or "magic number" — to work out what it really is, regardless of the extension. You get the format, its MIME type, what it's typically used for, and which apps open it. If the name says one thing but the content says another, it tells you. Everything runs in this tab; your file never leaves your device.
Identifying…
Detection is based on known file signatures and container contents. Most common formats are identified from their content with high confidence; a few (like plain text, CSV, or certain legacy formats) can only be narrowed down, and are labelled as such. A signature match confirms the container format but not that the file is safe — to check for embedded macros or scripts, use the Macro & script detector.