Privacy
File Type Detector
Upload any file and its true type is identified from its magic bytes (file signature) and compared against the claimed extension, so you can spot a disguised or mislabeled file.
Frequently asked questions
How can a file have the wrong extension?
Anyone can rename a file to change its extension. This tool reads the actual magic bytes inside the file to reveal its real format, regardless of the name.
Is this tool really free?
Yes — completely free, with no sign-up, no ads and no artificial limits.
Are my files kept or shared?
No. Processing happens on our servers, then the file is deleted immediately and an automatic cleanup removes any residue. Nothing is stored or sold.