File Type Detector
Detect the true file type of any file by reading its internal binary signature (magic bytes), independent of the file extension. Upload a file to instantly see its real MIME type and format description. Perfect for verifying mislabeled files, uncovering hidden formats, and ensuring security by checking actual content.
How to Use
- 1Select a file by clicking the upload button or dragging and dropping it onto the drop zone.
- 2The detection runs immediately – no separate button needed. Wait for the analysis to complete.
- 3Review the result showing the file name, original extension, true MIME type, a format description, and a mismatch warning if the extension is wrong.
Why use ShowPro's File Type Detector?
Frequently Asked Questions
What are magic bytes?
They are specific byte sequences at the very beginning of a file that identify its format. For instance, PNGs always start with 89 50 4E 47. Reading these bytes allows us to detect the file type regardless of the file name.
Why does my .jpg file show as PNG?
The file has been renamed with the wrong extension. The internal structure declares it as a PNG image. You should change the extension back to .png to ensure programs open it correctly.
Can it detect every file type?
It can detect a wide range of common types (~10 formats are checked via magic bytes). Very obscure or custom formats may be reported as “Unknown file type” if their signatures are not in the detection list.