SHA-1 Generator

A SHA-1 generator calculates a 160-bit Secure Hash Algorithm 1 digest from input bytes. The common hexadecimal representation is 40 characters long. SHA-1 is retained for legacy compatibility and checksum verification tasks, not for new security-sensitive designs.

SHA-1 is considered legacy and should not be used for new security-sensitive applications. Practical collision attacks have been publicly demonstrated — the SHAttered project (Google/CWI, 2017) produced the first real-world SHA-1 collision. All major TLS certificate authorities stopped issuing SHA-1 certificates in 2016 and browsers rejected them in 2017. Use SHA-256 for any new design.

Many older files, repositories, protocols, and verification instructions still publish SHA-1 values. The tool supports those compatibility and comparison tasks while clearly labelling SHA-1 as legacy and presenting SHA-256 and SHA-512 alongside it, making the migration path immediately visible.

Yes. Select the Local file tab, choose a file from your device, and the browser computes the SHA-1 digest from its bytes without uploading the file. All five algorithms are computed simultaneously so you can compare the SHA-1 against the SHA-256 of the same file.

SHA-1 produces 160 bits, normally displayed as 40 hexadecimal characters. The empty-string SHA-1 is da39a3ee5e6b4b0d3255bfef95601890afd80709.

No. SHA-1 is not an appropriate password-storage function — it is far too fast, has known collision vulnerabilities, and provides no salt. Use a dedicated salted password-hashing scheme such as Argon2id, scrypt, or bcrypt with an appropriate cost factor.

Use SHA-256 for the vast majority of general-purpose integrity and fingerprinting use cases. Use SHA-512 where a larger output or additional security margin is needed. Both are computed using the browser's native Web Crypto API and have no known practical attacks.

The underlying bytes may differ even when text looks identical. Check for trailing spaces, different line endings (LF vs CRLF), Unicode normalisation (NFC vs NFD), hidden characters, or different character encodings before comparing results.

Yes. The unified Hash Generator calculates SHA-1, SHA-256, SHA-384, and SHA-512 together from the same input, making it straightforward to compare a legacy SHA-1 checksum with the modern SHA-256 equivalent.

Yes. SHA-1 is computed using the browser's native crypto.subtle.digest('SHA-1') Web Crypto API. No text, file, or hash value leaves your device. Processing runs entirely in browser memory with no server call or persistent storage.

Type or paste the text and the SHA-1 digest appears instantly as a lowercase hex string. Processing is local, with no server round-trip.

Yes. Load the file — it is read locally — and compare the computed digest against the published checksum from a download page. A match confirms the file is intact.

No. SHA-1 is considered broken for security purposes and should only be used for legacy compatibility and non-security checksums.

SHA-1 produces a 160-bit (40 hex characters) digest. The hex form you see is two characters per byte, always the same length regardless of input size.

Yes. Hashing is deterministic — identical input bytes always produce the identical digest. Even a one-character change produces a completely different hash.

Yes, within browser memory. Because hashing runs locally there is no upload time and no file-size quota.

Git object ids and some older protocols still use SHA-1 formats. Treat it as legacy: fine for identifying content, wrong for security guarantees.

Everything runs locally in your browser with no upload, no account, and no logging. You can confirm in your browser DevTools Network tab that no request carries your data.