SHA-1 Hash Generator

About this tool

SHA-1 (Secure Hash Algorithm 1) is a hash function developed by the NSA and standardized in 1995. It produces a 160-bit fingerprint represented by 40 hexadecimal characters. In 2017, the first practical collision attack was published as Google's SHAttered project, which made SHA-1 cryptographically unreliable for digital signatures and certificates. Today it still appears in legacy systems, older SSL certificates, and git, which traditionally uses SHA-1 for commit identification, although git is gradually moving to SHA-256. This tool is intended for developers working with existing SHA-1 hashes or legacy systems. For all new projects, use SHA-256 or SHA-512.

How to use

1. 1Paste or type text into the input field.
2. 2Click Generate hash - the calculation runs instantly through the browser's Web Crypto API.
3. 3The resulting 40-character hash appears in the output field.
4. 4Copy the hash with the Copy button.
5. 5Warning: SHA-1 is deprecated - use SHA-256 or SHA-512 for new security-related solutions.

Specifications and limits

Output: 160 bits, 40 lowercase hexadecimal characters. Processed through the browser's native Web Crypto API - data is not sent to a server. Warning: SHA-1 has been cryptographically compromised since 2017 through the SHAttered collision attack. Suitable only for legacy systems or integrity checks in non-critical applications. Use SHA-256 or SHA-512 for security-sensitive applications.