Hash Generator — MD5, SHA-1, SHA-256, SHA-512
Generate cryptographic hashes from any text using the Web Crypto API — everything runs in your browser.
What Is a Hash Generator?
A hash generator takes any input text and produces a fixed-length string of hexadecimal characters called a hash (or digest or checksum). The same input always produces the same hash, but even changing a single character produces a completely different output. This property makes hashes useful for verifying data integrity, storing passwords securely, and creating digital signatures.
This tool generates hashes using four widely used algorithms simultaneously: MD5, SHA-1, SHA-256, and SHA-512. It uses the browser's built-in Web Crypto API for SHA algorithms and a JavaScript implementation for MD5, ensuring your data never leaves your device.
Hash Algorithms Compared
| Algorithm | Output Size | Hex Length | Security Status | Use Case |
|---|---|---|---|---|
| MD5 | 128 bits | 32 chars | Broken — not for security | File checksums, non-security verification |
| SHA-1 | 160 bits | 40 chars | Deprecated — avoid for security | Legacy systems, Git commit hashes |
| SHA-256 | 256 bits | 64 chars | Secure | Passwords, digital signatures, blockchain |
| SHA-512 | 512 bits | 128 chars | Secure | High-security applications, certificates |
Common Uses for Hash Functions
Developers use hashes for password storage (store the hash, never the plain-text password), file integrity checks (compare file hashes to detect corruption or tampering), data deduplication (identical files produce identical hashes), digital signatures (sign a hash of the document rather than the full document), and caching (use content hashes as cache keys to detect changes).
Hashing Is Not Encryption
A critical distinction: hashing is one-way and irreversible — you cannot get the original text from a hash. Encryption is two-way — encrypted data can be decrypted with the correct key. Never use hashing when you need to retrieve the original data, and never use encryption when you just need to verify data (like passwords).