Generate SHA-1 hashes from text or files instantly. SHA-1 produces a 160-bit (40 hex character) hash used in Git commit IDs, legacy certificate fingerprints, and file verification. Computed entirely in your browser.
SHA-1 is still used in Git (commit hashes), legacy TLS certificate fingerprints, and older integrity verification systems. Being deprecated for security but still common in non-security contexts.
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How to SHA-1 Hash Generator — 160-bit Checksums Online
- Open the Hash Generator tool
- Enter your text or upload a file
- Select "SHA-1" algorithm
- Click "Generate Hash"
- Copy the 40-character hex hash
- Use for Git comparisons or legacy system compatibility
Pro Tips
- SHA-1 always outputs exactly 40 hexadecimal characters (160 bits)
- Git uses SHA-1 for commit hashes — that is why git commit IDs are 40 chars
- SHA-1 has known collision attacks (SHAttered, 2017) — avoid for security
- For new projects: use SHA-256 instead of SHA-1
Frequently Asked Questions
Is SHA-1 still secure?
No. Google demonstrated a practical collision attack (SHAttered) in 2017. SHA-1 should not be used for digital signatures, certificates, or password hashing. Use SHA-256 or SHA-3 instead.
Why does Git still use SHA-1?
Git is transitioning to SHA-256. Git uses SHA-1 for content addressing (identifying commits), not security. Collision attacks require significant resources and are impractical for Git manipulation currently.
What is the difference between MD5 and SHA-1?
SHA-1 is longer (160 bits vs 128 bits) and computationally more complex. Both are broken for security, but SHA-1 provides marginally better collision resistance for non-security uses.
How do I verify a SHA-1 checksum?
Generate the SHA-1 hash of your downloaded file and compare it character-by-character with the published checksum. If they match exactly, the file is unmodified.
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