SHA-1 Hash Generator — Free Online Tool
Generate SHA-1 hash values from text or files online for free. Compute 40-character SHA1 checksums instantly in your browser. No data uploaded.
About SHA-1 Generator
SHA-1 (Secure Hash Algorithm 1) produces a 40-character hexadecimal hash and was widely used for file integrity verification and digital signatures. While SHA-1 is no longer recommended for security-critical applications due to known collision vulnerabilities, it is still used in legacy systems, version control (Git uses SHA-1 for commit hashes), and checksums where security is not the primary concern. Our generator computes SHA-1 hashes in your browser using the Web Crypto API with no server upload.
Frequently Asked Questions
Is SHA-1 still secure?
SHA-1 has known collision vulnerabilities and is deprecated for security-critical uses like TLS certificates.
What is SHA-1 commonly used for today?
Git uses SHA-1 for commit and file object hashes. Some legacy systems and non-security checksum verification still use SHA-1.
What is the length of a SHA-1 hash?
SHA-1 produces a 160-bit hash displayed as a 40-character hexadecimal string.
Is my data uploaded when I hash a file?
No — all hashing runs locally in your browser using the Web Crypto API.
What is the difference between SHA-1 and SHA-256?
SHA-256 produces a 256-bit (64 hex char) hash and is significantly more secure.