The Open File Signature Database

Identify and validate files by their magic bytes. Programmatic access via our free API, or browse the documentation below.

ENDPOINT DEFINITION GET

https://filesignature.org/api/v1/{ext}

EXAMPLE USAGE


              curl https://filesignature.org/api/v1/pdf

Popular Formats

View all →

.pdf Safe

Adobe Portable Document Format

25 50 44 46 2D

.jpg Safe

JPEG Image

FF D8 FF

.png Safe

Portable Network Graphics

89 50 4E 47

.exe High Risk

Windows Executable

4D 5A

.zip Medium

ZIP Archive

50 4B 03 04

.docx Safe

Microsoft Word Document

50 4B 03 04

Looking for something else?

We maintain a database of 905+ file signatures.

API Reference

GET /api/v1/{ext}

Returns the file signature data for a given extension.

{
  "success": true,
  "data": {
    "ext": "pdf",
    "name": "Portable Document Format",
    "mime": "application/pdf",
    "hex": "25 50 44 46",
    "offset": 0,
    "usage": { ... }
  }
}