Free Online SHA-1 Hash Generator
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Use this SHA-1 hash generator to compute the 160-bit SHA1 digest of any text string in real time. SHA-1 was once the default hashing algorithm for Git commits, TLS certificates, and digital signatures, and while it has since been shown to be vulnerable to collision attacks, it still shows up in legacy systems, version control internals, and compatibility checks that developers need to replicate. This tool is aimed at engineers verifying legacy hashes, students learning cryptographic hash functions, and anyone auditing older systems that still rely on SHA1. Because hashing happens locally in your browser via native JavaScript crypto APIs, nothing you type is ever transmitted or stored on a server — it's private by design. There's no account creation, no daily limits, and the digest updates instantly as you type. For new projects requiring collision resistance, pair this with the SHA-256 generator below instead. Start typing below to get your SHA-1 hash immediately.
Features
- Computes standard 160-bit (40 hex character) SHA-1 digests
- Instant client-side hashing, no page reload
- Handles arbitrary-length UTF-8 text input
- One-click copy-to-clipboard for the resulting hash
- Uppercase/lowercase hex display toggle
- Matches output from OpenSSL, Git, and standard crypto libraries
- Fully offline capable after initial load
- No text length restrictions
Why use this sha-1 hash generator?
- Fast, real-time hash generation with no waiting
- Fully client-side processing keeps your data private
- Accurate output matching industry-standard SHA1 implementations
- Clean interface with no clutter or ads getting in the way
- Free to use with unlimited hashes, no login needed
Frequently asked questions
Is SHA-1 still secure?
No. SHA-1 is considered cryptographically broken since 2017's SHAttered attack demonstrated practical collisions, so it should not be used for new security-critical applications.
Why is SHA-1 still used anywhere?
SHA-1 persists in legacy systems, some Git internals, and compatibility layers where migrating away is costly, but it's being phased out industry-wide.
How long is a SHA-1 hash?
SHA-1 always produces a 160-bit digest, shown as 40 hexadecimal characters.
What replaced SHA-1 for security purposes?
SHA-256 and the rest of the SHA-2 family (and increasingly SHA-3) are the recommended replacements for security-sensitive hashing today.
Does Git still use SHA-1?
Git historically used SHA-1 for commit hashing but has been transitioning toward SHA-256 support to address collision concerns.
Can I use SHA-1 for password hashing?
No. Even collision resistance aside, SHA-1 is too fast and unsalted for password storage — use bcrypt, scrypt, or Argon2 instead.
Is my input sent anywhere when I use this tool?
No, hashing runs entirely in your browser via JavaScript, so your text never leaves your device.
From the blog
MD5 vs SHA-256: Which Hash Should You Use?
MD5 vs SHA-256 compared on security, speed, and digest length — why MD5's collision break disqualifies it and when a 128-bit checksum is still fine.
Hash Collisions Explained (With Real Examples)
What a hash collision is, why the birthday paradox means an n-bit hash only offers n/2 bits of collision resistance, and how MD5 and SHA-1 were actually broken.