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Generate SHA-1 hash values from text input. Secure hash algorithm producing 160-bit hash values.
Generate a SHA-1 digest of any text, computed locally in your browser.
SHA-1 produces a 160-bit (40 hex character) digest. It is still used for non-security checksums, Git object IDs, and legacy integrity checks, but it is no longer collision-resistant and must not be used for digital signatures, certificates, or any new security-sensitive purpose. Prefer SHA-256 or SHA-3 for those. All hashing runs locally in your browser.
SHA-1 (Secure Hash Algorithm 1) turns any text or file into a fixed 160-bit value, written as a 40-character hexadecimal string. Like every cryptographic hash it is deterministic and one-way: the same input always produces the same digest, a single-character change scrambles the entire result, and there is no practical way to recover the original input from the digest alone.
This generator runs entirely in your browser. Whatever you paste stays on your device — nothing is uploaded, logged, or stored — so you can hash sensitive strings without them ever leaving the tab. SHA-1 remains common in places where its output size or historical compatibility matters, such as Git object identifiers, legacy checksums, and older integrity checks.
One important caveat: SHA-1 is broken for collision resistance and has been deprecated for security use. Researchers have demonstrated practical collisions — two different inputs that share the same digest — so SHA-1 must never be used for digital signatures, TLS certificates, password storage, or any new security-sensitive purpose. For those cases use SHA-256, SHA-3, or a dedicated password hash such as bcrypt or Argon2. Treat SHA-1 as a compatibility and identification checksum, not a security guarantee.
No. SHA-1 is broken for collision resistance — attackers can craft two different inputs with the same digest — and it has been deprecated for security use. Use SHA-256 or SHA-3 for anything that must resist tampering.
It is mainly used in non-security contexts such as Git commit and object identifiers, legacy checksums, and older systems that expect a 160-bit digest. It should not be used for new security-sensitive work.
No. SHA-1 is fast and unsalted, which makes brute-force and lookup attacks easy. Use a slow, salted password hash such as bcrypt, scrypt, or Argon2 for credentials.
A SHA-1 digest is 160 bits, displayed as 40 hexadecimal characters, regardless of how long the input is.
No. The hash is computed locally in your browser, so the text you enter never leaves your device.