SHA-1 Hash Generator
Generate SHA-1 hashes instantly using the Web Crypto API. Free online SHA-1 hash generator with hex output. Runs entirely in your browser — no server requests.
Frequently Asked Questions
What is SHA-1?
SHA-1 (Secure Hash Algorithm 1) produces a 160-bit (40-character hex) hash digest. It was designed by the NSA and published by NIST. While stronger than MD5, SHA-1 has known theoretical weaknesses and has been deprecated for digital signatures.
Is SHA-1 secure?
SHA-1 is no longer considered secure for cryptographic purposes. Google demonstrated a practical collision attack (SHAttered) in 2017. For security-critical applications, use SHA-256 or SHA-512 instead. SHA-1 is still acceptable for non-security checksums.
How fast is this SHA-1 generator?
This tool uses the Web Crypto API (crypto.subtle.digest), which provides hardware-accelerated hashing in modern browsers. SHA-1 hashes are generated in microseconds, even for large inputs.
What is the difference between SHA-1 and SHA-256?
SHA-1 produces a 160-bit hash (40 hex characters) while SHA-256 produces a 256-bit hash (64 hex characters). SHA-256 is significantly more resistant to collision attacks and is the current standard for most security applications.