Loading
Security
Break down text by letter frequency, a classic first step in cracking a substitution cipher.
Runs entirely in your browser, nothing is uploadedOnly counts letters A-Z; digits, spaces, and punctuation are ignored. Useful for spotting patterns in substitution-cipher ciphertext, since English letter frequency is famously uneven (E and T are common, Q and Z are rare).
Encode or decode text with a Caesar shift cipher, or crack one with an unknown shift using letter-frequency analysis.
Open toolEncrypt or decrypt text with a passphrase using AES-256-GCM.
Open toolEncode or decode text with ROT13, or convert it to and from Morse code.
Open tool