SHA1 Generator

Generate a SHA-1 hash from any text input. Copy or download the hash without sending data anywhere.

Input
1
Output
1
0 characters 0 lines

SHA1 Generator

This SHA-1 generator creates a 160-bit hash digest from any text you enter. Paste or type your input, press Generate, and the tool produces the 40-character hexadecimal SHA-1 hash instantly in your browser.

The hashing runs locally using the Web Crypto API built into every modern browser. Your input is never uploaded or stored on a server, so you can generate hashes privately and quickly without changing your workflow.

How to use

  1. Type or paste text into the input editor.
  2. Click Generate SHA1 to compute the hash digest.
  3. The 40-character hexadecimal hash appears in the output editor with a confirmation message.
  4. Use Copy for the clipboard, Download for a text file, or Clear to reset both editors.

What is SHA-1?

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (20-byte) hash value, typically rendered as a 40-character hexadecimal string. It was designed by the NSA and published by NIST in 1995.

SHA-1 is deterministic: the same input always produces the same hash. It is a one-way function, meaning you cannot reverse a hash to recover the original input. While SHA-1 is no longer considered secure for digital signatures or certificate verification, it remains widely used for checksums, content addressing, and non-security-critical fingerprinting.

Common uses

SHA-1 hashes are used in Git commit identifiers, file integrity checks, data deduplication, and legacy systems that predate SHA-2. If you need a stronger hash for security purposes, consider using SHA-256 or SHA-512 instead.

Example

Here is how a short text message maps to its SHA-1 hash:

--- Input Text ---
Hello, World!

--- SHA-1 Hash ---
0a0a9f2a6772942557ab5355d76af442f8f65e01