📁 File Selection
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or
🎨 Output Format
⏳ Processing File...
📊 Hash Results
📊 Hash Results
Select a file and algorithms to generate hashes...
ℹ️ About File SHA-1 Generation
SHA-1 file hash generation calculates a repeatable digest from the exact bytes in a selected file. SHA-1 is a 160-bit Secure Hash Algorithm from the NIST Secure Hash Standard family. It remains common in older manifests and version-control identifiers, but it is no longer suitable for new cryptographic protection.
Output format: 40 hexadecimal characters, such as a9993e364706816aba3e25717850c26c9cd0d89d for a file whose bytes are exactly abc.
Useful for:
- Checking legacy SHA1SUM manifests
- Comparing historical release archives
- Working with systems that still publish SHA-1 digests
Limitations: SHA-1 is collision-weakened and NIST is transitioning away from SHA-1 for all cryptographic protection. Use it only for compatibility and verify security-sensitive files with SHA-256, SHA-512, or a signature.
Privacy and performance: The interactive page reads the selected file in your browser and generates the digest locally. Very large files can take longer because the browser must read the file bytes before hashing.
Original references: FIPS 180-4 and NIST SHA-1 transition plan.