FILE TYPE
File Type Detect, reveal the real format by magic bytes.
File Type Detect: identify the real format from magic bytes (images/PDF/archives/audio-video/Office) and check if the extension matches. Free online, runs locally in your browser, nothing uploaded.
How to use?
Drop a file or click to choose. The tool reads only the first few bytes (magic numbers) to guess the real type, then compares it with the filename extension to catch mismatches. Everything runs locally — nothing is uploaded, ideal for quickly verifying a downloaded file or a suspicious extension.
FAQ
Is it safe? Are my files uploaded?
Everything runs locally in your browser. Only the first 256 bytes are read for detection; none of your files are uploaded.
What if it is not recognized?
If the header is not in the built-in signature library (e.g. plain text or an uncommon format), it shows "not recognized". Use the leading-bytes view to judge manually.