MIME Type & File Extension Inspector
Inspect the true MIME type, binary magic bytes, and recommended extension for unknown files.
Inspect Unknown File Magic Bytes & MIME
Identify true binary signatures (magic bytes) to verify damaged or renamed extensions
About MIME Type & File Extension Inspector
Determine the genuine internal format of damaged, corrupted, or extension-less files by analyzing header magic byte signatures (e.g. %PDF, PK, \xFF\xD8\xFF).
How to Use MIME Type & File Extension Inspector
Upload any unknown or suspicious file.
The engine reads the first byte headers to detect true MIME type.
View recommended file extension and official IANA media type.
Supported Formats & Limits
- Supported Inputs: ALL FORMATS
- Guest Maximum Size: 25 MB
- Logged-in Max Size: 100 MB
- System Compatibility: Windows, macOS, Linux, iOS & Android
Privacy & Security Guarantee
This tool processes your files entirely inside your web browser using client-side JavaScript, WebAssembly, and Canvas APIs. Your document is never uploaded to any external server, guaranteeing total confidentiality.
Frequently Asked Questions
Why does magic byte inspection matter?
Renaming an executable `.exe` to `.pdf` does not make it a PDF. Magic byte checking reveals the true binary format for security.