What is the difference between basic and advanced?

Basic swaps a, e, i, o, s and t for 4, 3, 1, 0, 5 and 7. Advanced also swaps b, g and z for 8, 6 and 2 for a heavier 1337 look.

Is decoding always exact?

Decoding maps the leet numbers back to letters, which restores the common cases. Since leetspeak is lossy and stylized, unusual substitutions may not round-trip perfectly.

Are spaces and punctuation kept?

Yes. Only letters (when encoding) or digits (when decoding) are converted; spaces, punctuation and other characters pass through unchanged.

Is my text sent anywhere?

No. The conversion happens entirely in your browser; nothing is uploaded.

Leetspeak (1337) Converter

Turn ordinary text into leetspeak — the classic hacker and gamer style where letters become look-alike numbers (e becomes 3, o becomes 0). Pick a basic or advanced substitution set, or switch to decode mode to turn 1337 numbers back into letters. Everything runs locally in your browser — nothing is uploaded.

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ModeLevel

Input

Output

H3ll0 W0rld

How to use

Choose encode (text to leet) or decode (leet to text).
For encoding, pick the basic or advanced substitution level.
Type or paste your text and copy the result.

Frequently asked questions

What is the difference between basic and advanced?: Basic swaps a, e, i, o, s and t for 4, 3, 1, 0, 5 and 7. Advanced also swaps b, g and z for 8, 6 and 2 for a heavier 1337 look.
Is decoding always exact?: Decoding maps the leet numbers back to letters, which restores the common cases. Since leetspeak is lossy and stylized, unusual substitutions may not round-trip perfectly.
Are spaces and punctuation kept?: Yes. Only letters (when encoding) or digits (when decoding) are converted; spaces, punctuation and other characters pass through unchanged.
Is my text sent anywhere?: No. The conversion happens entirely in your browser; nothing is uploaded.

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