Computes the MD5, SHA-1 and SHA-256 hash of texts, one line = one text. Give a hash to look for to find out which line matches it. Everything happens in your browser.

In real life: CyberChef, the md5sum command. A hash cannot be « decrypted », but you can compute the hash of each candidate and compare: that is how a Gravatar avatar is linked to an e-mail address.