File Format Detector

What Is the File Format Identifier?

The file format identifier reads the magic bytes at the start of a file to determine its real type, detecting common formats such as PNG, JPG, GIF, PDF, ZIP, ELF, WAV, and MP3, and showing the matching MIME type and header bytes in hex.

Key Features

• Detect the real format by reading the file header
• Support images, documents, archives, audio, executables, and more
• Show detected type, MIME type, and header HEX
• Everything runs locally — files are never uploaded

Use Cases / Notes

Ideal for checking whether a file's extension was renamed, or troubleshooting corrupted or mislabeled downloads. Detection relies on header signatures, not the extension, so formats without a fixed signature may not be recognized.

How to Use

1. Click Choose File and select a local file to identify
2. The tool reads the header automatically and shows the result
3. Review the format, MIME, and header info, and copy if needed