File Signature Checker
Read the first bytes of a file locally and compare them with common archive signatures.
Local processingNo uploadNo accountNo tracking scripts
Choose a file to identifyReads only the first bytes locally and compares common archive signatures.
Choose a file to inspect its signature locally.
Tool capability
Clear support notes help avoid overpromising. This page is a private browser utility, not a full desktop archive suite.
Supported now
- ✓ Magic-byte preview
- ✓ Common archive signatures
- ✓ Local first-byte read
Not supported yet
- × Deep file forensics
- × Malware scanning
How this tool protects privacy
This page is designed to run inside your browser. The selected file is not uploaded by the static site. For sensitive archives, avoid tools that require a server upload before they explain how files are handled.
Limitations
Very large archives may be slow. Browser support differs for advanced compression methods. ZIP files using unsupported methods may still be inspected even when every entry cannot be extracted.