Free · Find a MIME type from file bytes
File MIME Type Finder
Open a binary file and get the MIME type and extension found by its signature.
- Real magic-byte check
- Private in your browser
- JSON report
Open a local file
The file stays in this browser tab. Detection uses its binary signature, not just its name.
Drop one file hereUp to 100.0 MB
Files stay in this tab. The checker reads bytes but never opens or runs the file.
ResultReading the safe sample
Reading the signatureThe file is not opened or run.
A useful hint, not proof. A matching signature does not prove that a file is complete, valid, or safe. This tool does not scan for viruses.
Three simple steps
How to use it
- Choose one binary file.
- Copy the detected MIME type or extension.
- Treat the result as a strong hint, not a safety check.
Your files stay on this device
file-type reads the binary signature inside this browser tab. Bookify does not upload, save, open, or run the file. The result is a best-effort hint, not proof that a file is valid or safe.