SHA-1 Hash Generator - Create SHA-1 Checksums Online

Generate SHA-1 hashes from text or files in your browser. Create 160-bit checksums for legacy compatibility. Fast, private, no uploads to servers.

Security Note: SHA-1 is cryptographically broken. For security purposes, use SHA-256 or SHA-512 instead.

Text to Hash

Drop file here or click to select

Any file type supported

SHA-1 Hash (40 characters)

lowercase

UPPERCASE

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Frequently Asked Questions

SHA-1 (Secure Hash Algorithm 1) produces a 160-bit (40 hex character) hash. It was widely used but is now deprecated for security purposes due to collision vulnerabilities.

No. SHA-1 has known collision attacks and should not be used for security applications. Use SHA-256 or SHA-512 instead. SHA-1 is still acceptable for non-security checksums and legacy compatibility.

Legacy systems, Git commit hashes (though moving to SHA-256), and some checksum verification still use SHA-1. It's fine for non-security purposes like detecting accidental corruption.

Yes. All hashing uses your browser's Web Crypto API. No data is sent to any server.

SHA-1 produces a 160-bit hash (vs MD5's 128-bit) and is slightly more secure, but both are deprecated for cryptographic use. For security, use SHA-256 or better.

SHAttered (2017) was the first practical SHA-1 collision attack, demonstrating two different PDF files with identical SHA-1 hashes. This proved SHA-1 is no longer secure for digital signatures or certificates.

Yes, but Git is transitioning to SHA-256. Git's use case (detecting accidental corruption) is less vulnerable than cryptographic signatures, but the ecosystem is migrating for future security.

You can, but only if the source provides SHA-1 checksums and you're verifying against accidental corruption, not malicious tampering. For security-critical downloads, request SHA-256 checksums instead.

SHA-1 is slightly faster than SHA-256, which is one reason it remained popular. However, the security benefits of SHA-256 far outweigh the minimal performance difference on modern hardware.

Yes. Once loaded, the tool works completely offline. All hashing happens in your browser using built-in Web Crypto API functions—no internet connection required.

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