Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, and CRC32 hashes instantly. Supports text input, file hashing, HMAC mode, and hash comparison. 100% client-side— your data never leaves your browser.
Frequently Asked Questions
What is a hash?
A hash is a one-way mathematical function that converts any input (text, file, password) into a fixed-size string of hexadecimal characters — a digital "fingerprint." Even a single character change in the input produces a completely different hash output. Hashes are used for data integrity verification, password storage, digital signatures, and file checksums.
Which hash algorithm should I use?
For security-sensitive applications (password hashing, digital signatures, code signing), use SHA-256 or SHA-512. For non-security checksums (verifying file downloads, detecting duplicates), MD5 or CRC32 are fast and sufficient. Never use MD5 or SHA-1 for security — both have known collision vulnerabilities.
Is MD5 secure?
No. MD5 has been cryptographically broken since 2004. Researchers demonstrated practical collision attacks, meaning two different inputs can produce the same MD5 hash. Use MD5 only for non-security purposes like file integrity checks. For security, always use SHA-256 or stronger.
Is my data sent to a server?
No. This tool runs 100% in your browser using the Web Crypto API and JavaScript implementations. Your text and files never leave your device. You can disconnect from the internet and the tool still works. We have no ability to see what you hash.
Can I reverse a hash?
No. Cryptographic hash functions are one-way by design — you cannot mathematically recover the original input from a hash value. This is what makes them useful for password storage. However, attackers use pre-computed lookup tables (rainbow tables) to find common inputs matching known hashes, which is why strong, unique inputs and salting matter.
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