Privacy & Security
All file analysis happens locally in your browser using the File API. Your files never leave your device.
Drop files here or click to browse
Supports batch analysis of up to 100 files
Need Help with File Security Analysis?
Our security team can help analyze suspicious files, implement upload validation, and protect your systems from file-based attacks.
Frequently Asked Questions
Common questions about the File Magic Number Checker
Magic numbers are unique byte sequences at the beginning of files that identify their format. For example, PDFs start with %PDF (hex: 25 50 44 46), PNGs start with 89 50 4E 47, and ZIP files start with PK (hex: 50 4B). These signatures are more reliable than file extensions.
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⚠️ Security Notice
This tool is provided for educational and authorized security testing purposes only. Always ensure you have proper authorization before testing any systems or networks you do not own. Unauthorized access or security testing may be illegal in your jurisdiction. All processing happens client-side in your browser - no data is sent to our servers.