What is MD5 and what is it used for?

MD5 is a 128-bit cryptographic hash function designed by Ron Rivest in 1992. Despite being cryptographically broken, it remains one of the most widely used hash functions for non-security purposes such as file integrity verification (checksums), database indexing, and download validation. Many software distributions still provide MD5 checksums alongside their downloads.

Is MD5 secure for password hashing?

No. MD5 is cryptographically broken — collision attacks are practical, and MD5 hashed passwords can be cracked rapidly using rainbow tables and GPU acceleration. Use bcrypt, Argon2id, or scrypt for password storage.

Why is MD5 still widely used if it's broken?

MD5 remains popular for non-security applications where speed and simplicity matter more than cryptographic strength. File checksums, cache keys, and database hash indexes don't need collision resistance — they just need a fast, evenly distributed hash function, which MD5 provides.

What are the practical attacks against MD5?

Chosen-prefix collision attacks allow attackers to create two different files with the same MD5 hash. This was demonstrated in 2008 when researchers created a rogue SSL certificate. For file checksums, intentional collision requires control over both files, limiting practical exploitation.

What should I use instead of MD5?

For security: SHA-256 or SHA-3. For high-speed non-security use: BLAKE3 or xxHash64. For file checksums where MD5 compatibility is not required: SHA-256 produces a stronger 256-bit digest.

Tools

MD5|32 hex chars

Input

Output

Hash result will appear here...

0 chars|0 bytes

MD5 Hash Calculator — Free Online MD5 Generator

The most widely deployed hash in computing history. 128-bit output, used everywhere for file checksums, database indexing, and download integrity. Cryptographically broken — do not use for security.

Features

✓Compute MD5 hashes online — the most widely deployed hash in computing history
✓Real-time 128-bit hash computation with 32 hex character output
✓One-click copy, download as .txt, and uppercase/lowercase toggle
✓Widely used for file integrity checks, database indexing, and download verification
✓Hash verification against known MD5 checksums with auto-detect
✓100% browser-based — zero server uploads, your data never leaves your device

How to Use

1Type or paste your text into the input box above.
2Your hash digest appears instantly — no page reload needed.
3Toggle UPPERCASE / lowercase to change the hex output format.
4Click the copy icon to copy the hash to clipboard, or use Download to save as .txt.
5Paste an expected hash into the Verify field to check for a match.

Frequently Asked Questions

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