Home › Hash Generator

Free Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text. Uses the browser's native Web Crypto API for SHA variants. Instant and offline-capable.

Hash Output (SHA-256)
Algorithm
Hash Length

What Is a Hash Function?

A cryptographic hash function takes any input and produces a fixed-size output (the "hash" or "digest"). The same input always produces the same hash, but even a tiny change in the input completely changes the output. Hashes are one-way — you cannot reverse a hash to recover the original input.

Hashing is used everywhere in security: password storage, file integrity verification, digital signatures, blockchain, and data deduplication. When you log into a website, the server typically stores a hash of your password rather than the password itself.

Comparing Hash Algorithms

MD5 produces a 128-bit hash. It is fast but considered cryptographically broken — collisions (different inputs producing the same hash) have been demonstrated. Use it only for checksums, not for security. SHA-1 (160-bit) is also deprecated for security use after collision attacks were proven feasible. SHA-256 and SHA-512 are part of the SHA-2 family and remain secure for all current applications. SHA-256 is the most widely used, including in Bitcoin and TLS certificates.

This tool uses the browser's native Web Crypto API for SHA variants, ensuring high performance and correctness. MD5 is computed using a pure JavaScript implementation since the Web Crypto API does not support MD5.

More Security Tools

Password Generator Password Strength Checker SSL Certificate Checker DNS Lookup IP Address Lookup Base64 Encoder / Decoder URL Encoder / Decoder

Frequently Asked Questions

What is the difference between MD5 and SHA-256?
MD5 produces a 128-bit (32 hex character) hash and is fast but cryptographically broken — collisions can be generated. SHA-256 produces a 256-bit (64 hex character) hash and remains secure against all known attacks. Use SHA-256 or SHA-512 for any security-sensitive application.
Can I reverse a hash to get the original text?
No. Cryptographic hash functions are designed to be one-way. However, attackers can use precomputed tables (rainbow tables) or brute force to find inputs that match a known hash. This is why salting (adding random data before hashing) is used for password storage.
Why is MD5 still included if it is broken?
MD5 is still widely used for non-security purposes like file integrity checks and checksums. Many legacy systems and download sites provide MD5 hashes for verifying file downloads. It should not be used for passwords or digital signatures.
Is the Web Crypto API secure?
Yes. The Web Crypto API is a browser-native interface to cryptographic operations, implemented in optimized native code. It is more secure and faster than any pure JavaScript implementation. It is supported in all modern browsers.
What is a hash collision?
A collision occurs when two different inputs produce the same hash output. For a secure hash function, finding collisions should be computationally infeasible. MD5 and SHA-1 have known collision vulnerabilities, while SHA-256 and SHA-512 do not.