Online SHA-1 Hash Generator
SHA-1 (Secure Hash Algorithm 1) produces a 160-bit hash value (40 hexadecimal characters). Paste your text to compute the SHA-1 hash directly on your device, without sending data to any server.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
hello world
Example Output
2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
How to Use
- 1Type or paste your text into the Input field.
- 2Click the Generate Hash button (or press Ctrl+Enter) to compute the SHA-1 hash.
- 3The SHA-1 hash appears in the Output field. Click Copy to copy it.
- 4Click Clear to start over.
About SHA-1
SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function designed by the National Security Agency (NSA) and published in 1995. SHA-1 produces a 160-bit hash value, shown as 40 hexadecimal characters, from an input of any length.
How it works: SHA-1 splits the message into 512-bit blocks and processes them through 80 rounds of bitwise operations, modular addition, and rotations. Like other hash functions, SHA-1 is one-way and deterministic — easy to compute forward, but practically impossible to reverse to find the original input.
For years SHA-1 was widely used in SSL certificates, Git, and digital signatures. But in 2017, Google demonstrated a practical collision attack (the "SHAttered" project), so SHA-1 is now considered insecure for security. For new applications, use SHA-256 or higher.
FAQ
Is SHA-1 still safe to use?
SHA-1 is no longer recommended for security purposes because collision attacks have been demonstrated to be practical. For security, use SHA-256 or higher. SHA-1 is still used in some legacy systems and non-critical verification.
Is my data sent to a server?
No. All computation happens in your browser; your text is never sent anywhere.
What is the difference between SHA-1 and MD5?
SHA-1 produces a 160-bit hash (40 hex), while MD5 produces a 128-bit one (32 hex). SHA-1 is generally a bit stronger than MD5, but both are now considered obsolete for security.