SHA1 Hash Generator
Convert your text into a SHA1 hash. Generate secure SHA1 hashes instantly using our online tool.
SHA1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (20-byte) hash value, typically rendered as a 40-digit hexadecimal number.
Key characteristics of SHA1:
- Fixed output length (40 hexadecimal characters)
- Deterministic (same input always produces same output)
- Small changes in input create large changes in output
- Computationally efficient
- One-way function (cannot be reversed)
Example SHA1 hashes:
- "hello" → "aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d"
- "test" → "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3"
Important Security Note:
While SHA1 is still used in many applications, it is no longer considered cryptographically secure against well-funded attackers. For security-critical applications, please use stronger algorithms like SHA-256 or SHA-3.
SHA1 hashes are commonly used for:
- Version control systems (like Git)
- Digital signatures
- File integrity verification
- Message authentication codes
- Data deduplication
Technical Details:
This tool uses the Web Crypto API to generate SHA1 hashes, ensuring consistent results across all modern browsers. The hashing is performed entirely in your browser, and no data is sent to any server.
For generating file hashes or processing large amounts of data, consider using a local command-line tool like OpenSSL or a dedicated hashing utility.