Explore a coded message or convert text between common formats with this free cipher and encoding workbench. Apply ROT shifts, Atbash, Morse code, binary, hexadecimal or Base64, compare all ROT candidates and chain operations without switching tools. Everything runs locally in your browser, with no login, installation or upload of your text for processing.
ROT/Atbash transform ASCII letters and preserve other characters. Hex, binary and Base64 use UTF-8 bytes; decoding rejects invalid UTF-8. Morse supports English letters, digits and common punctuation, uppercases text and normalises whitespace; / separates words. Results are candidates, not confirmed solutions. Chain up to ten operations. Limit: 100,000 input characters (20,000 for all ROT candidates).
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How to encode or decode text
- Paste your input. Enter plain text, a coded message or an encoded value in Text or encoded input.
- Choose an operation. Select a letter transformation or the appropriate text-to-format or format-to-text conversion.
- Set the shift for ROT. Choose a value from 0 to 25 when using ROT letter shift. Other operations do not use this setting.
- Click Apply operation. Review the output, then copy it or download the result as a text file.
- Continue if needed. Click Use result as next input to apply another operation to the current output.
Choose the operation yourself based on the input and the result you expect. The workbench does not automatically identify an unknown cipher or confirm that a message has been solved.
ROT13, Caesar shifts and candidate comparison
The ROT operation shifts ASCII letters around the alphabet while preserving their case. Digits, punctuation and other characters remain unchanged. With a shift of 13, the input Uryyb, jbeyq! becomes Hello, world!.
For a nonzero shift, use 26 minus the original shift to reverse it. For example, reverse a shift of 3 with a shift of 23. Shift 0 leaves the text unchanged; ROT13 reverses itself when applied a second time.
If you do not know the shift, choose Compare all ROT candidates. The tool displays 26 possibilities, including the unchanged input, and lets you download the comparison as JSON. Read through the candidates using the message’s context. A readable-looking result is a candidate, not a confirmed solution.
Atbash and Morse code
Atbash reverses the ASCII alphabet: A becomes Z, B becomes Y, and so on, while preserving letter case and leaving other characters alone. For example, Hello becomes Svool. Apply Atbash again to reverse the transformation.
The Morse options convert supported English letters, digits and common punctuation. Encoding uppercases letters and normalises whitespace, so it does not preserve the original capitalisation or exact spacing. Spaces separate Morse characters and a slash separates words.
For example, HELLO WORLD becomes:
.... . .-.. .-.. --- / .-- --- .-. .-.. -..Unsupported characters or unknown Morse sequences produce an error. If you only need a dedicated Morse tool, you can also use our text to Morse code converter.
Convert text to binary, hex or Base64
The binary, hexadecimal and Base64 operations encode text as UTF-8 bytes. That means a character can use more than one byte; it is not always a one-character-to-one-number conversion.
For the text Hello, the workbench produces:
| Format | Encoded output |
|---|---|
| Hexadecimal | 48 65 6c 6c 6f |
| Binary | 01001000 01100101 01101100 01101100 01101111 |
| Base64 | SGVsbG8= |
When decoding, hexadecimal requires complete two-digit bytes and binary requires complete eight-bit groups. Base64 decoding accepts standard Base64 with the correct padding where required. Whitespace is ignored in these encoded inputs. Decoded bytes must form valid UTF-8 text; arbitrary binary files are not supported as text output.
Chain operations and review the steps
Some puzzles or data workflows involve more than one transformation. After applying an operation, click Use result as next input, choose the next operation and apply it. The operation history shows each step and its output.
You can chain up to ten operations. Editing the input yourself starts a new history when you next apply an operation, and resetting the form clears the chain. To reverse a chain, undo its operations in reverse order using the corresponding inverse conversions.
Limits and local processing
Most operations accept up to 100,000 input characters. Comparing all ROT candidates has a smaller limit of 20,000 characters. Expanded output may exceed the input limit for a later step, so shorten the source if a chain becomes too large.
Your text is transformed on your device. These reversible encodings and simple letter transformations are useful for puzzles, learning and inspecting text formats; they are not password-based protection for confidential information. No result is presented as proof of a successful decode.
