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.
Is this tool free?
Yes. All KappaKit tools are free, run in your browser, and require no signup or account.