Related Tools
SHA-1 Hash Generator
Generate SHA-1 hashes from text or files in your browser. Free, no upload. For compatibility use.
SHA-1 produces a 160-bit (40-character hex) hash. It was widely used for security (e.g. Git, TLS) but is now deprecated for new security use due to practical collision attacks. It's still useful for compatibility with Git, legacy APIs, or older systems. Our generator runs in your browser; no data is uploaded.
When to use SHA-1 Hash Generator vs other formats
Use SHA-1 when you need compatibility with Git (commit hashes), legacy APIs, or existing systems that require SHA-1. For any new security or integrity use, prefer SHA-256. Use MD5 only for non-security checksums or when a system requires it. Do not use SHA-1 for new password hashing or signatures.
Compatibility
SHA-1 is supported in most languages and tools. Git still uses SHA-1 for commit IDs. Many legacy systems and APIs expect SHA-1. For new designs, choose SHA-256. All hashing here is client-side.
Quality considerations
SHA-1 is no longer considered secure against collision attacks; NIST and others have deprecated it for signatures. For non-adversarial uses (e.g. Git-style IDs, legacy checks), it's still acceptable. Do not rely on SHA-1 for verifying untrusted or high-value content.
Example use cases
- Understand or verify Git commit or object hashes (SHA-1).
- Match legacy systems or APIs that require SHA-1 output.
- Generate checksums for internal or non-security file checks.
- Compatibility testing with tools that only accept SHA-1.
- Educational or comparison use alongside MD5 and SHA-256.
Powered by browser APIs and client-side processing.