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SHA-1 Hash Generator

Generate SHA-1 message digests from any text input using the Web Crypto API.

All processing happens in your browser. No data is sent to any server.
Deprecation Notice: SHA-1 is deprecated for cryptographic use. Collision attacks have been demonstrated (SHAttered, 2017). Use SHA-256 or SHA-512 for security-critical applications.
Input 0
SHA-1 Hash 0

How It Works

SHA-1 (Secure Hash Algorithm 1) produces a 160-bit (20-byte) hash value, typically rendered as a 40-character hexadecimal string. It was designed by the NSA and published by NIST in 1995 as a federal information processing standard (FIPS PUB 180-1).

This tool uses the Web Crypto API's crypto.subtle.digest('SHA-1', data) method to compute the hash natively in your browser. The input text is first encoded to UTF-8 bytes, then passed to the digest function, and the resulting ArrayBuffer is converted to a hexadecimal string.

While SHA-1 was widely used in TLS certificates, Git commits, and digital signatures, practical collision attacks have been demonstrated. Major browser vendors and certificate authorities have deprecated SHA-1. For new applications, SHA-256 or SHA-3 are recommended alternatives.

All computation runs entirely in your browser using the built-in Web Crypto API. Your data is never transmitted to any server.

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