Felo

Opposite Alphabet Code Translator Online

Encode English into the opposite alphabet code (A↔Z, B↔Y, … M↔N) or decode coded text back into English. The full mirror map is stated with every result, documented phrase and word overrides are applied, and punctuation, digits and unsupported characters are preserved rather than dropped. Try it online.

What is Opposite Alphabet Code Translator Online?

Opposite Alphabet Code Translator Online turns English text into the mirror alphabet code, where A becomes Z, B becomes Y, C becomes X, and so on through M↔N, and turns that code back into English. It is the same idea as the classic 'Z=A A=Z' cipher: each letter is swapped for the letter the same distance from the other end of the alphabet. You type a sentence, say which direction you want, and get copyable text back with the mapping explained.

Key Features

Full mirror alphabet, both cases. Every letter from A to Z has exactly one counterpart, and uppercase and lowercase are handled separately so capitalisation survives the round trip.
Two-way conversion. Encode English into opposite letters, or paste coded text and decode it back. If you do not say which direction you want, the agent infers it and tells you what it assumed.
Documented overrides. A short list of phrase and word pairs, plus the prefixes 'un-' and 'pre-', are handled as units before letter substitution, and the response names which overrides fired.
Nothing silently dropped. Spaces, punctuation, digits, emoji and non-Latin characters are preserved as-is, and the response lists anything that was left unchanged.
Verification built in. Ask for a round-trip check and the agent re-encodes its own output to confirm it matches your original.

How to Use

Type your text and, if you like, the direction: for example "encode: hello world" or "decode: svool dliow".
Read the converted text in the code block, then check the short note listing the rule used, any overrides applied, and any characters preserved unchanged.
Ask for a refinement in plain language, such as decoding a longer passage, keeping line breaks, or explaining a single letter's counterpart.

Example Use Cases

Writing a playful coded note. Turn "hello world" into "svool dliow" and send it to a friend who has to work out the opposite alphabet code.
Decoding a puzzle clue. Paste a string of mirror letters from an escape room or puzzle sheet and get readable English back, with the mapping shown so you can check it by hand.
Teaching the cipher. Ask what the opposite of the letter A is, then request the full A↔Z table to show how a simple substitution cipher works.

Tips for Best Results

Say "encode" or "decode" when the text could plausibly be either; mirror-coded English and ordinary English can look similar at a glance.
Keep the original text handy if you plan several rounds of edits, since each reply converts only what you send in that turn.
Ask for the mapping table whenever you need to verify a result by hand.

FAQ

What input does it accept?

Plain text of any length you can paste into a message. Letters are converted; spaces, punctuation, digits and other symbols are preserved. Very long passages may be split across replies, and the agent will say so.

How accurate is the result?

The letter mapping is fixed and deterministic, so encoding and decoding are exact for the 26 English letters. The phrase, word and prefix overrides follow the documented list; anything outside that list is converted letter by letter. The agent states which overrides fired so you can check.

How does this agent present its results?

This agent returns copyable text with the mapping stated, names the overrides used, and reports preserved characters. It does not offer a live preview grid, a random-sentence button, comments or saved history.

Does it produce images or audio?

No. The output is text only.