File X-Ray
Inspect any file's true type, size and raw bytes.
This tool runs entirely in your browser. Your file is never sent anywhere.
Upload any file to see its declared type, its real type detected from binary signatures, dimensions if it's an image, and a hex dump of its first bytes — useful for verifying a file is what it claims to be.
Frequently asked questions
Why would a file's declared type differ from its real type?
A renamed file (e.g. a .txt actually containing a JPEG) keeps its old extension but its binary signature reveals the truth.
Is my file uploaded anywhere?
No — only the first 64 bytes are read locally in your browser to detect the signature; the file itself never leaves your device.