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SHA-1 Hash Generator (Legacy)

Calculate legacy SHA-1 digests for file and integration compatibility. Collision resistance is broken; never use SHA-1 for new security designs.

SHA-1 — legacy

SHA-1 is broken for collision resistance. Use SHA-256/SHA-512 or modern authenticated constructions for new security designs. This legacy tool is for compatibility and checksums only.

What is SHA-1 Hash Generator (Legacy)?

SHA-1 produces a 160-bit message digest. Practical collision attacks have made it unsuitable for modern digital signatures, certificate verification and applications that depend on collision resistance. This browser-only generator is intended for legacy compatibility, not for protecting passwords, authenticating messages or designing new security mechanisms.

How to use this tool

  1. Use SHA-1 only when a legacy protocol or tool explicitly requires it.
  2. Enter UTF-8 content and choose HEX, Base64 or Base64URL output.
  3. Copy or export the digest, while preferring SHA-256/SHA-512 or HMAC for modern designs.

Example

SHA-1('abc') = a9993e364706816aba3e25717850c26c9cd0d89d

Related developer tools

SHA-512 Hash GeneratorSHA-256 Hash GeneratorHMAC Generator