unsent.tools hash calculator

Hash calculator

CRC-32, MD5, SHA-1, SHA-256/384/512 and HMAC of text or a file — computed with your browser's own crypto, so the passwords, tokens, and documents people habitually paste into "online hash generators" never leave this page.

Text to hash

append trailing newline (what echo pipes into md5sum) Text is hashed as UTF-8.

…or hash a file

Try:

Digests click a value to copy

hex Base64

Compare against an expected checksum

Expected digest (hex or Base64 — case, spaces and colons ignored)

HMAC (keyed hash)

Secret key (UTF-8 text; leave empty for plain hashes above)

With a key, the table above shows HMAC-MD5 / HMAC-SHA-* of the same message instead (CRC-32 has no HMAC).

MD5 and SHA-1 are fine as integrity checksums against accidental corruption, but both are cryptographically broken: collisions can be manufactured, so don't use them for signatures or fingerprinting attacker-supplied data. CRC-32 is only an error-detection code — it is trivially forgeable and not a cryptographic hash at all. Files are hashed in memory in your browser; very large files (hundreds of MB) may be slow or fail, but they still never leave your machine.