Felo

Randomized English Letter Substitution Translator Online

Scramble English text by swapping every letter and digit through a fixed substitution table, exactly as a cipher-style character translator does. Unlike a black-box page, it shows the full mapping, supports the reverse direction, and reports which characters were left unchanged. Try it online.

What is Randomized English Letter Substitution Translator Online?

This agent performs a fixed character substitution on English text. Every digit from 0 to 9 and every letter from A to Z and a to z is replaced by a specific alternate character from a published lookup table. The result looks scrambled, like a simple cipher, but it is completely deterministic: the same input always produces the same output. It is not a language translation, and it is not random per character despite the common label used for this kind of tool.

Key Features

Complete published mapping. All 62 mapped characters are listed, so you can check any result by hand.
Reverse decoding. Ask for the reverse direction and the agent applies the inverse table to turn scrambled text back into English.
Preservation reporting. Spaces, punctuation, emoji and other unmapped characters are kept exactly as typed, and the agent tells you which ones were left alone.
Exact whitespace handling. Line breaks and spacing are never trimmed or collapsed unless you ask.
Sample text generation. Ask for a random English sentence to test the tool quickly.

How to Use

Paste or type your English text in the chat. Include digits if you want to see how they are swapped.
Read the scrambled result in the copyable code block. If you want the mapping explained, ask for the table.
To decode, start your message with "reverse:" or simply say "decode this" and paste the scrambled text.

Example Use Cases

Making a puzzle clue: scramble a short phrase for a classroom cipher puzzle, then decode a student's answer with the reverse mode.
Obfuscating a spoiler: turn a sentence into scrambled characters so a friend can decode it later with the same table.
Testing a substitution cipher: compare your own hand-built cipher against this fixed randomized English letter substitution translator to see where the tables differ.

Tips for Best Results

Keep the original text handy; the mapping is one-to-one, so decoding is exact for mapped characters.
If your text contains accented letters, Chinese characters or emoji, expect them to pass through unchanged, and check the preservation note.
Ask for the full table once and save it if you plan to encode and decode by hand.

FAQ

What input does it accept?
Any plain text. Letters and digits are substituted; everything else is preserved. Very long text is handled in full, but extremely long pastes may be split across blocks for readability.

Is the output accurate?
Yes, for the mapped characters, because the substitution is a fixed table applied by a deterministic script. The agent does not guess. Characters outside the table are intentionally left as they are, and the agent reports them.

How is this different from some free text tools?
Many free text tools apply a hidden substitution and only show the result. This agent also publishes the table, supports decoding, and states clearly that the mapping is fixed rather than random per character. It does not offer accounts, saved history or a graphical two-box interface; results arrive as copyable text in the chat.

Can it translate into another language?
No. This is character substitution, not translation.