Encode and decode Caesar, ROT13, Atbash, Vigenère, A1Z26, pigpen and more
The Caesar cipher moves every letter a fixed number of places along the alphabet. It is named after Julius Caesar, who, according to Suetonius, used a shift of three for private letters. With only 25 possible shifts, it is easy to break by trying every one, which is what the list above does. Tap a row to use that shift. Caesar cipher on Wikipedia
In the pigpen cipher, each letter is swapped for the shape of the part of a grid it sits in, with a dot for the second grid of each pair. This tool uses one common layout (grid, grid, X, X), shown in the key. The Freemasons used it from the early 18th century, which is why it is also called the masonic cipher. Anyone who knows the key can read it, so it is for fun, not for real secrets. Pigpen cipher on Wikipedia