Hash Generator Online Free
Generate SHA-256, SHA-1, and SHA-512 cryptographic hashes instantly in your browser. Free, private, no signup required.
How to Generate a Hash Online
- 1
Type or paste your text
Enter any text into the input box. The hash is computed instantly as you type.
- 2
Choose your algorithm
Select SHA-256, SHA-1, or SHA-512 from the algorithm selector. The hash output updates immediately.
- 3
Copy the hash
Click the Copy button next to the hash output to copy it to your clipboard.
A cryptographic hash function takes any input text and produces a fixed-length output called a hash or digest. The same input always produces the same hash, but even a single character change produces a completely different output — this is known as the avalanche effect.
SHA-256 is the most widely used algorithm today. It appears in TLS/SSL certificates, blockchain protocols (Bitcoin uses double SHA-256), JWT tokens, and password storage pipelines (usually combined with a salt).
SHA-512 offers a larger output (512 bits vs 256 bits) and can be faster on 64-bit processors due to its internal 64-bit word size. Use it when you need a stronger guarantee or larger key derivation space.
SHA-1 produces 160-bit hashes and was once the industry standard. It is now considered cryptographically broken for digital signatures and certificates, though it remains acceptable for non-security uses like content-addressable file caches (git uses SHA-1 internally).
All hashing on this page uses the browser's built-in crypto.subtle.digest() API. Your text never leaves your device.