SHA-1 Hash Generator
Generate the SHA-1 hash of any text using the native Web Crypto API. 40-character hex hash, processed locally.
About SHA-1
SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function whose digest is 160 bits long, which works out to 40 hexadecimal characters. The NSA developed it, and NIST published it back in 1995.
These days SHA-1 no longer holds up for cryptographic use, since collision attacks against it have been known since 2017. Even so, you'll still run into it across legacy systems, in version control (Git uses SHA-1 internally) and when checking the integrity of non-critical files.
For anything new you're building, go with SHA-256 or SHA-512. Both give you considerably more security.
Generate the SHA-1 hash of a text
Feed it any text and SHA-1 turns it into a fixed string of 40 hexadecimal characters. The tool computes it with the browser's native Web Crypto API, so you get the reliability of a standard implementation.
This hash still shows up a lot in version-control systems (Git, for instance, uses it to identify commits) and in legacy integrity checks. Worth a heads-up, though: for cryptographic purposes it's considered broken and shouldn't be used for signatures or passwords, where SHA-256 is the right pick. As an identifier or plain checksum, it stays useful.
Nothing you paste leaves the browser, since the whole calculation runs there. Paste the content and the SHA-1 hash appears.
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