A small library for detecting the type of a file based on header signature (also known as magic number).

A library for detecting file types.

python file signature identifier - Use this to identify files from their headers

🎩🐇 Toolkit for detecting and verifying file type using magic bytes in pure Golang

Use 'magic' to guess file types

File validator that checks by magic bytes and MIME types

Advanced File Fingerprinting

Identify a file via MIME type and file signature detection.

Curated reference of file magic bytes for file type identification and forensics.

Currently a PNG file inspector, capable of detecting faults and corrupted blocks

A simple library for validating & checking file types. Written in V

Evade file content checks by prepending magic bytes to any file

What is a magic byte anyway? This tutorial will get you comfortable with the concept.

Python tool to create polyglot files for magic byte bypass by merging with valid file formats (JPEG, PNG, PDF, DOCX, MP4, etc.)

Mundane Elements is a system for checking the filetype of a given file using Magic Bytes.

File fingerprinting and signature detection based on known file header formats. A primary use-case is file upload validation in ASP.NET Core applications.

FUFP (File Upload Fuzz Pack) is a curated collection of files designed to test, fuzz, and analyze file upload mechanisms in web applications.

FileInspectorX is a library for content type detection (magic bytes + heuristics) and lightweight analysis (containers, PDFs, PE triage, text/script cues) across .NET 8, .NET Standard 2.0 and .NET Framework 4.7.2. A thin PowerShell module provides pipeline‑friendly cmdlets with reusable typed views.

Deterministic file type & MIME detection for .NET with fail-closed archive validation, secure extraction, and hashing evidence (SHA-256/HMAC).

A C++ library for file type detection based on magic numbers. It only supports WebP, PNG and JPEG/JPG formats. All other formats determined as unknown.