File Signature Analyzer
Determine what a file actually is by analyzing its magic bytes and header data.
🔒 Your files never leave your browser. All analysis happens locally.
Drop a file here or click to select
Any file type supported
Hex Preview (first 128 bytes)
What It Does
Files are identified by their magic bytes (file signatures) — the first few bytes that indicate the true format, regardless of the file extension.
How It Works
Reads the first bytes of your file and compares them against a database of known file signatures. Detects mismatches between the extension and actual file type.
Use Cases
- Verify file integrity after downloads
- Detect renamed/disguised files
- Identify unknown file formats
- Security triage of suspicious files
Privacy
All analysis happens locally in your browser using the FileReader API. No data is uploaded or transmitted.
These tools are intended for inspection, triage and documentation purposes. They do not replace professional forensic workflows or certified forensic software.