Felo

Null Language Translator Online – Encode and Decode

Convert English text into Null Language symbols or decode Null Language back into Latin letters using a fixed 26-letter substitution map. Every substitution is shown explicitly and unsupported characters are preserved rather than dropped, so you can check the result character by character. Try it online.

What is Null Language Translator Online – Encode and Decode?

This is a conversational encoder and decoder for the themed Null Language cipher. It takes ordinary English letters and replaces each one with a fixed Null symbol, and it performs the same operation in reverse when you paste Null symbols. The mapping is a simple per-letter substitution: a becomes @, b becomes B, e becomes E, o becomes 0, s becomes $, j becomes Z, z becomes J, and so on through the alphabet. It is a cipher for fun, roleplay and lore-flavored messages, not a translation into a real spoken language.

Key Features

Exact 26-letter map. Every Latin letter has one fixed Null counterpart, applied consistently wherever it appears in a word.
Two directions. Encode English into Null symbols, or decode Null symbols back into Latin letters.
Preservation by default. Spaces, punctuation, digits and line breaks pass through unchanged, and characters outside the map are kept and flagged rather than silently removed.
Visible substitution table. The response includes the mapping used, so you can verify each character yourself.
Round-trip check. On request, the agent encodes and then decodes your text to confirm the original comes back intact.

How to Use

Type your English text and say you want it encoded, for example: “Encode this in Null Language: meet me at the gate”.
To go the other way, paste Null symbols and ask for a decode, for example: “Decode this Null text: MEE T ME”.
If you are unsure of the direction, just paste the text; the agent will identify whether it looks like English or Null symbols and state which direction it chose.

Example Use Cases

Themed roleplay messages. Encode a short in-character line for a Null Language story set around City A, then share the symbol version with your group.
Decoding a Null Language message. Paste a string of Null symbols you received and get the Latin-letter reading back, with any unmapped characters called out.
Cipher practice and checking. Encode a sentence, then ask for the round-trip decode to confirm the mapping behaves as expected before you use it elsewhere.

A quick before-and-after: the word hello encodes to HELL0, and HELL0 decodes back to hello.

Tips for Best Results

Say “encode” or “decode” explicitly when your text could plausibly be either; it removes any ambiguity.
Keep the original capitalization in mind: the map is case-sensitive, so uppercase letters are not converted the same way as lowercase ones.
If a character comes back unchanged, it is outside the 26-letter map; ask for the list of unsupported characters if you need to clean the text first.

FAQ

What input format does it accept?
Plain text in the chat. There is no file upload requirement; paste or type the English or Null text directly. Very long passages are handled in sections, and the agent will tell you if a section was cut.

How accurate is the result?
The conversion is deterministic: the same letter always produces the same symbol, and the reverse map is the exact inverse. Accuracy depends on the fixed table, not on guessing, so you can verify any output character by character against the table shown in the response.

How is this different from some free text tools?
Some free text tools present a two-box interface with a random sentence button and no explanation of the mapping. This agent instead states the direction it used, shows the substitution table, preserves unsupported characters, and can run a round-trip check on request. It does not reproduce a graphical two-textarea layout, and it does not generate font files, audio or images.