MD5 Hash Generator

Generate MD5 hashes from text in your browser. Fast 128-bit checksums for deduplication, ETags, and cache keys — not for security.

hash

md5

sha

security

crypto

RFC 1321

Input Text

Note: Hashes are generated client-side. MD5 uses a bundled implementation; SHA uses the Web Crypto API.

About MD5 Hash

MD5 is a 128-bit hash function designed by Ron Rivest in 1991 and standardised as RFC 1321. It produces a 32-character hexadecimal digest from any input. This generator ships a bundled MD5 implementation that runs in your browser — SubtleCrypto deliberately refuses MD5 because the algorithm is broken for security use, so we include our own RFC 1321-compliant version tested against the official test vectors. What MD5 is still good for: file deduplication (comparing large files by hash rather than byte-by-byte), ETag generation in HTTP caching, cache-busting fingerprints on static assets, and non-adversarial integrity checks where a collision would only happen by accident rather than deliberate attack. Git uses SHA-1 for similar reasons — collisions exist but don't happen in practice unless someone is actively trying to produce one. What MD5 is not good for: password hashing (use argon2id or bcrypt), digital signatures (use SHA-256 or SHA-512), malware detection (attackers can and do craft collisions to evade MD5-based signatures), or anything where an attacker controls the input. Chosen-prefix collisions against MD5 can be computed in seconds on a laptop. The algorithm stays popular for legitimate reasons, but "is this MD5?" and "is this secure?" are two independent questions.

Features

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes
Hash any text input in real-time
Compare hash outputs across multiple algorithms
Copy hash values to clipboard

How to Use

Enter or paste your text into the input field
View hash values generated across all algorithms
Click any hash value to copy it to your clipboard
Use the hashes for data integrity verification

Frequently Asked Questions

Why doesn't the browser's SubtleCrypto support MD5?

MD5 is cryptographically broken — chosen-prefix collisions can be computed in seconds. The browser deliberately refuses to implement it so developers don't accidentally use it for security. This tool ships a bundled MD5 implementation for the legitimate non-security uses that remain.

Is MD5 faster than SHA-256?

Yes, noticeably — MD5 is about 2–3x faster on general-purpose CPUs, since the algorithm is simpler and uses a smaller state. For hashing very large files (gigabytes) where the hash is only for deduplication or integrity checking, MD5 remains a reasonable speed-first choice.

Can I use MD5 to check file integrity?

Against accidental corruption, yes — if bits flip randomly during transfer, MD5 catches it reliably. Against a deliberate attacker, no — an attacker can craft two files with the same MD5 and swap one for the other. Use SHA-256 for integrity checks where the sender isn't trusted.

Why is MD5 still used if it's broken?

Because "broken for security" and "broken for all uses" are different. MD5 is perfect for cache keys, content-addressable storage, fingerprinting non-adversarial inputs, and interoperating with older systems. The ecosystem hasn't replaced it there because nothing is broken about those uses.