Type or paste anything and see its MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 all at once, updating as you type. Add a key to get an HMAC instead — the construction webhooks use to prove a request really came from the sender.
Paste the checksum you were given and the matching row lights up, whatever spacing, case or colons it arrived with. Everything is computed on your device.