Skip to content

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

25 50 44 46 2D

5 bytes checked.

Matching Formats

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

.pdf

Adobe Portable Document Format

Safe

application/pdf

Matched Signature

25 50 44 46 2D
Offset 0
.ai

Adobe Portable Document Format

Safe

application/postscript, application/illustrator

Matched Signature

25 50 44 46
Offset 0
.fdf

Adobe Portable Document Format

Safe

application/vnd.fdf

Matched Signature

25 50 44 46
Offset 0
.bib

BIB

Safe

application/x-bibtex-text-file

Matched Signature

25
Offset 0
.bibtex

BIBTEX

Safe

application/x-bibtex-text-file

Matched Signature

25
Offset 0