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Header Byte Identification

Magic Byte Lookup

Paste the first bytes of a file as hex to find matching formats, MIME types, byte offsets, and risk levels. This lookup checks header signatures; trailer-only signatures are documented on their format pages.

Examples: PDF PNG ZIP MP4

Normalized input

00 00 00 18 66 74 79 70 69 73 6F 6D

12 bytes checked.

Matching Formats

4 candidates matched the supplied bytes. Shared containers can produce multiple results.

.mp4

ISO Base Media file

Safe

video/mp4

Matched Signature

66 74 79 70 69 73 6F 6D
Offset 4
.mov

QuickTime movie file

Safe

video/quicktime

Matched Signature

66 74 79 70
Offset 4
.qt

QT

Safe

video/quicktime

Matched Signature

66 74 79 70
Offset 4
.pif

Program Information File (Windows DOS shortcut)

High

Not officially registered

Matched Signature

00
Offset 0