Free tools

SHA-1 Hash Generator

Generate SHA-1 hashes instantly in your browser — free online SHA-1 hash generator for text and strings.

Free SHA-1 Hash Generator

Enter any text above and click Generate SHA-1 Hash to instantly get the 40-character hexadecimal SHA-1 digest. This free online SHA-1 hash generator works entirely in your browser using the Web Crypto API — your text is never sent to any server.

What Is SHA-1?

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (40-character hexadecimal) hash value from any input data. It was designed by the NSA and published by NIST in 1995. While SHA-1 is no longer recommended for security-critical applications due to demonstrated collision vulnerabilities, it remains widely used for non-security purposes such as Git commit hashes, file checksums, and legacy system compatibility.

Is SHA-1 Still Safe to Use?

For cryptographic purposes such as digital signatures, SSL certificates, or password hashing, SHA-1 should not be used. Google and CWI Amsterdam demonstrated a practical collision attack (SHAttered) in 2017. However, for non-security uses like generating unique identifiers, Git object hashing, or checksums where collision resistance is not critical, SHA-1 remains perfectly adequate. For security-sensitive applications, use SHA-256 or SHA-3 instead.

How to Use This SHA-1 Hash Generator

  1. Enter any text, string, or passphrase into the input field.
  2. Click Generate SHA-1 Hash to compute the hash instantly.
  3. Copy the 40-character hexadecimal hash with the copy button.

Common Uses

  • Generating Git commit, tree, and blob object hashes
  • Verifying file integrity for legacy systems and protocols
  • Generating unique, deterministic identifiers from input strings
  • Maintaining compatibility with older systems that require SHA-1
  • Creating checksums for internal data tracking where collision resistance is not critical

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