Free Hash Generator Online
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text — instantly in your browser using the Web Crypto API.
How it works
Enter your text
Type or paste the string you want to hash into the input field.
Select algorithm
Choose from SHA-256, SHA-512, SHA-1, or MD5.
Generate
The hash is computed client-side using the browser's Web Crypto API.
Copy the hash
Click any hash value to copy it. Your input never leaves your browser.
Common use cases
File integrity verification
Hash a file's content to produce a checksum you can compare later to verify the file hasn't been tampered with or corrupted.
Password hashing education
Understand how password hashing works — see how the same input always produces the same hash and how a single character change completely changes the output.
API request signing
Many APIs require HMAC-SHA256 signatures on request bodies. Understanding the hash of your payload helps debug signing implementations.
Content-addressed storage
Hash file content to create a unique ID for storing and deduplicating files in object storage (the SHA256 of a file is its "fingerprint").
Frequently asked questions
What is a cryptographic hash?
A hash function converts any input into a fixed-size output (the digest). The same input always produces the same hash; different inputs produce different hashes (with overwhelming probability).
Which algorithm should I use?
Use SHA-256 for general purposes — it's the industry standard. SHA-512 is stronger but produces a longer digest. Avoid MD5 and SHA-1 for security applications as they have known vulnerabilities.
Is MD5 safe?
MD5 is broken for security purposes — collisions can be generated intentionally. It's still useful for non-security checksums (file deduplication, cache busting), but never use it for password hashing or digital signatures.
Can I reverse a hash?
No — cryptographic hash functions are one-way by design. You cannot recover the original input from the hash. This makes them ideal for storing passwords (you store the hash, not the plaintext).
Does my input get sent to a server?
Never. Hashing uses SubtleCrypto.digest() — a native browser API. Your text is hashed entirely in your browser tab.
Why does changing one character completely change the hash?
This is called the avalanche effect — a key property of good hash functions. Even a tiny input change produces a completely different output, making it impossible to guess inputs from partial hashes.