How to use MIME detect
- 1. Drop a file. Read locally.
- 2. Read MIME and extension. Magic beats filename when they disagree.
- 3. Don't trust Content-Type from the network. Servers lie; bytes less so.
- 4. Hash if you need integrity. MIME is not a signature.
About this tool
A .png renamed to .jpg is still a PNG. Magic bytes are how honest tools decide. This identifier is a short list, not libmagic.
What is covered
PDF, PNG, JPEG, GIF, WebP, SVG, ZIP, gzip, MP3, JSON, HTML, XML, text.
Unknown
application/octet-stream plus the filename extension.
Code examples
PNG
89 50 4E 47