How is the real file type detected?

The tool reads magic numbers in the file header, which is more reliable than file extensions.

Is my file uploaded to a server?

No. Detection runs locally in the browser; file bytes never leave your device.

Extensions can be renamed freely—malware often masquerades as images or docs; magic bytes reveal the real format.

Click or drag and drop to upload file

Drag and drop a file or click to upload

Online tree structure generator from Markdown lists

JWT decode online—parse headers, payloads, and verify signatures

Team API management tool

SVG icons for front-end technology stack

Semver version range query

Online browser User-Agent parser