A1Z26 is the first cipher most people invent on their own, swapping each letter for its position, A for 1, Z for 26. It appears in puzzle hunts, escape rooms, and the notes kids pass expecting adult confusion.
Encode letters as 1-26 numbers and decode them back, handling multi-digit values so the message does not lose its way. It is trivial to break and delightful to solve, which is exactly why puzzle designers keep it in the rotation.
Try it now: open the free tool, runs 100{ddff9936f8333f09603555df7bd6492034f3a4a35de784276d3cf3d66166a113} in your browser.
Bottom line: encode as numbers, attach an alphabet key if you share it.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use A1Z26 Cipher?
Open the A1Z26 Cipher in your browser (Letters to numbers and back). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste the text you want to work with.
- Choose the transformation you need.
- Copy the result, or tweak the input to see it update live.
Try A1Z26 Cipher free. It opens right in your browser.