Hash Generator

How to Generate a Hash

1. Type or paste your text into the input field.

2. All hash values (MD5, SHA-1, SHA-256, SHA-512) are calculated instantly.

3. Click any hash to copy it to your clipboard.

What Are Hash Functions?

A cryptographic hash function takes any input and produces a fixed-size string of characters. The same input always produces the same hash, but it is practically impossible to reverse the hash back to the original input. Hash functions are fundamental to computer security, data integrity, and digital signatures.

Common Hash Algorithms

• MD5 — 128-bit hash (32 hex characters). Fast but not collision-resistant. Use only for checksums and non-security purposes.
• SHA-1 — 160-bit hash (40 hex characters). Deprecated for security use since 2017. Still found in legacy systems and Git commit hashes.
• SHA-256 — 256-bit hash (64 hex characters). Part of the SHA-2 family. Used in TLS/SSL, Bitcoin, code signing, and digital certificates. The recommended choice for most applications.
• SHA-512 — 512-bit hash (128 hex characters). Maximum security in the SHA-2 family. Slightly faster than SHA-256 on 64-bit processors.

Use Cases for Hash Functions

• File integrity: Compare hashes to verify downloaded files weren't corrupted or tampered with
• Password storage: Store hashed passwords instead of plaintext (always use salt + slow hash like bcrypt)
• Digital signatures: Sign documents by hashing content and encrypting the hash
• Deduplication: Identify duplicate files by comparing their hash values
• Blockchain: Bitcoin and Ethereum use SHA-256 for block hashing and proof of work

FAQ

Can I reverse a hash back to the original text? No. Hash functions are one-way — you cannot reverse them. Attackers use rainbow tables and brute force, which is why salting is important for passwords.

Which hash algorithm should I use? SHA-256 for most purposes. MD5 is fine for file checksums where security isn't critical. Never use MD5 or SHA-1 for passwords or security.

Is MD5 still safe? MD5 is safe for checksums and data integrity checks. It is NOT safe for cryptographic security, digital signatures, or password hashing — collisions can be generated in seconds.

Is my data sent to a server? No. All hashing is done locally in your browser using the Web Crypto API. Your text never leaves your device.