Reading the table
Each row is one tested shift. The useful line is usually the one where natural words and a coherent sentence appear.
Automatic Caesar decoder
Automatically test the 25 possible Caesar shifts.
Codes
Paste a Caesar-encrypted message and instantly compare all 25 shifts in a clean table, with row copy or full export.
Encrypted message
0 source char.
Possible shifts
The 25 shifts will appear here.
| Shift | Shifted text | Copy |
|---|---|---|
| Add an encrypted message. | ||
Quick explanation
Enter the encrypted message: the tool calculates all 25 possible outputs. Find the readable line, then copy it or export every attempt.
Try this too
Already know the shift?
Use the Caesar cipher tool to encode or decode precisely with a chosen value.
Additional information
What is the automatic Caesar decoder for?
When a message looks like a Caesar cipher but the shift is unknown, the fastest method is to test all 25 possible shifts and look for the readable line.
Full copy
Copy all keeps the source message and every output, useful for comparing hypotheses or saving a trace.
Related tool
Once the shift is found, use the Caesar cipher tool to encode or decode precisely with that value.
Quick example
| Encrypted message | Useful shift | Readable result |
|---|---|---|
| PHVVDJH | 3 | MESSAGE |
Try also
If no shift gives clear text, the message may use ROT13, the Vigenère cipher, or another substitution method. For the historical principle, see Wikipedia about the Caesar cipher.
Limits and reuse
AppErgo tools are provided free of charge for practical and informational purposes. Although care is taken in their design, a result may be incomplete, unexpected or incorrect. Before relying on a result for any important use, check it using an appropriate method.
To report a bug in the tool, you can use the dedicated bug report form.
Results produced by AppErgo tools may be copied and reused freely. When publicly reusing a result, a method or an AppErgo page, a link to the relevant page is appreciated.
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