Felo

Secret Code Translator Online

Encode English text into a secret code or decode coded text back to English using a fixed reverse-alphabet letter map and a digit permutation. Every substitution is shown in a mapping table, unmapped characters such as spaces and punctuation are preserved, and results are verified with a round-trip check. Try it online.

What is Secret Code Translator Online?

Secret Code Translator Online is a conversational tool that turns plain English into a simple secret code and turns that code back into English. It uses a fixed character substitution: each letter is swapped for its mirror in the alphabet, so a becomes z, b becomes y, and so on, while digits 1 through 9 are swapped using a fixed permutation. The same rules run in reverse to decode. You type text, say whether you want to encode or decode, and get a copyable result plus the mapping used.

Key Features

Exact reverse-alphabet letters. Lowercase a–z and uppercase A–Z each map to a single fixed counterpart, so the output is fully predictable.
Fixed digit permutation. Digits 1–9 follow the map 1→8, 2→6, 3→7, 4→9, 5→2, 6→4, 7→1, 8→3, 9→5, and decoding uses the true inverse.
Bidirectional use. Encode English into code, or paste code and decode it back to English.
Character preservation. Spaces, punctuation, the digit 0 and any character outside the map are kept exactly as typed rather than dropped.
Mapping table and round-trip check. Each answer includes the substitution table and a verification that decoding the encoded text returns the original.

How to Use

Type or paste your text and state the direction, for example “encode: meet me at 5” or “decode: nvv g v zg 2”. If you do not state a direction, the agent assumes encode and says so.
Read the converted text in its own copyable block, followed by the mapping table and a short note on any characters that passed through unchanged.
Ask for the reverse direction, a longer passage, or an explanation of a specific character to refine the result.

Example Use Cases

Secret code translator for kids’ notes. Encode a short message like “secret meeting at 7” so children can swap coded notes, then decode the reply.
Secret code translator for puzzle answers. Turn a phrase into code for a classroom or party puzzle, and decode a submitted answer to check it.
Secret code translator for game props. Produce coded labels or riddles for a treasure hunt, keeping digits and punctuation intact so clues stay readable.

Tips for Best Results

Say “encode” or “decode” explicitly; coded text and English can look similar at a glance.
Keep the mapping table handy if you plan to write code by hand, since the digit map is not symmetric.
Remember this is a toy substitution, not secure encryption, so do not use it for passwords or private data.

FAQ

What input does it accept?
Any text you can type or paste. Letters and digits 1–9 are substituted; spaces, punctuation, 0 and other characters are preserved unchanged. Very long passages are handled in sections, and you will be told if a section is trimmed.

How accurate is the result?
The substitution is deterministic, so the same input always gives the same output. Every answer includes a round-trip check confirming that decoding the encoded text returns the original characters.

How does this compare with some free text tools?
Some free text tools apply a similar substitution but show no mapping table and do not explain how digits or punctuation behave. This agent states the full map, preserves unmapped characters, and verifies round trips, while remaining a simple toy cipher rather than real encryption.