Leet speak (1337 speak) is an internet slang that replaces standard letters with similar-looking numbers or symbols: A→4, E→3, L→1, O→0, S→5, T→7, etc. It originated in early internet and hacker culture.

What are the substitution levels?

Basic level substitutes only the most common characters (A, E, O, I, S). Standard adds more. Full leet substitutes nearly every letter with numbers or symbols.

Can leet speak be decoded back to normal text?

Basic and standard leet are fairly reversible since the substitutions are consistent. Full leet can be ambiguous because some symbols map to multiple letters.

What is leet speak used for today?

Mostly for humour, gaming usernames, internet culture references, and retro aesthetic text. It is occasionally used in casual obfuscation, though it offers no real security.

Leet Speak Converter

Converts text to leet speak (1337 5p34k) by substituting letters with visually similar numbers and symbols. Choose from basic (E→3, A→4, O→0), standard (adds more substitutions), or full leet mode for maximum substitution density. Popular in gaming and internet culture.

Runs entirely in your browser — your input is never uploaded, stored, or logged.

Type your text and choose your leet level to generate 1337 speak output. For other fun text transformations, try the Pig Latin Converter.

Examples

Basic leet

Input

Hello World

Output

H3ll0 W0rld

Frequently Asked Questions

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