MD5, SHA-256 Hash Calculator Online

Compute MD5, SHA-1, SHA-256 and SHA-512 of text. Runs entirely in your browser — nothing is uploaded.

MD5
d41d8cd98f00b204e9800998ecf8427e
SHA-1
da39a3ee5e6b4b0d3255bfef95601890afd80709
SHA-256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA-512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

The hash calculator computes checksums of text: MD5, SHA-1, SHA-256 and SHA-512 — all at once, updating as you type. A hash is a fixed-length "fingerprint" of data: you can't reconstruct the original text from it, but the same input always produces the same hash.

Hashes are used to verify file integrity (compare a checksum before and after downloading), to store passwords (combined with a salt), for signatures, and as cache keys. A note on security: MD5 and SHA-1 are outdated — collisions have been found for both — so use SHA-256 or SHA-512 for anything security-related, and hash passwords with dedicated slow functions (bcrypt, argon2) instead.

Everything is computed locally in your browser (MD5 in plain JS, SHA via the Web Crypto API), so your data is never transmitted anywhere.

Frequently asked questions

No. All hashes are computed right in your browser; the text is never uploaded.
MD5 (128-bit) and SHA-1 are outdated and unsuitable for security — collisions have been found for both. Use SHA-256 or SHA-512 for signatures and password-related work.
No, a hash is irreversible. "Cracking" it is only possible via dictionary or brute-force attacks — which is why passwords should use a salt and slow functions (bcrypt/argon2).

You may also need

JWT decoderRegex testerText diffCron to textXML ⇄ JSON