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Ciphers & Encoding

Classic ciphers, codes, secret messages and text encoders. 11 free tools that run in your browser, no sign-up needed.

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ROT13 Encoder / DecoderEncode and decode ROT13, ROT47, ROT5, ROT18 and any Caesar shift live as you type.Hidden Message EncoderHide a secret message inside normal text with invisible zero-width characters, and reveal it.Leet Speak TranslatorTurn text into 1337 speak at basic, medium or advanced level, or decode leet back to English.METAR DecoderPaste a raw METAR or SPECI weather report and read it in plain English with VFR/IFR category.Cryptogram MakerTurn any quote into a printable cryptogram puzzle with hints, letter frequencies and an answer key.TAF DecoderPaste a TAF aviation forecast and read a plain-English timeline with VFR/IFR categories.Bacon CipherEncode and decode Baconian A/B code (24 or 26 letters) and hide messages in letter case.Code of Conduct GeneratorCreate a code of conduct for a community, open source project or event, with reporting and enforcement.E-Number LookupLook up food additive E-numbers and INS codes, or paste ingredients to identify every additive.Pigpen Cipher TranslatorTurn text into pigpen cipher symbols, download a PNG, print it, or decode with a symbol keyboard.Polybius Square CipherEncode and decode Polybius square coordinates with a standard or keyword 5×5 or 6×6 grid.

About Ciphers & Encoding

Classic ciphers and codes like ROT13, leet speak and hidden messages, plus decoders for aviation weather reports. Fun for puzzles and learning how simple encryption works; they are not meant for securing real secrets.

Most used here: ROT13 Encoder / Decoder, Hidden Message Encoder and Leet Speak Translator.

Classic ciphers for puzzles and learning

ROT13, Bacon, pigpen, Polybius square and cryptogram tools recreate classic letter-substitution ciphers. They are great for escape rooms, classroom lessons and puzzle hunts, but they are not secure: anyone can decode them in seconds, so never use them to protect real secrets.

Decoders for real-world codes

Some tools here decode practical formats instead: the METAR and TAF decoders turn aviation weather reports into plain English, and the E-number lookup explains food additive codes found on ingredient labels in Europe.

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