Free · Check whether a file is a known image

Image File Type Checker

Read the bytes to spot PNG, JPEG, GIF, WebP, camera raw, and other supported image types.

  • 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.

file-type · local
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

  1. Open the file that should be an image.
  2. Check the detected image format and MIME type.
  3. Treat an unknown result as a reason to inspect more.

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.