Leet Speak Translator (1337)
Convert text to and from leet speak (1337): basic number swaps, an advanced multi-character style, or a random mix. Decoding is best-effort. Runs in your browser.
Leet speak, or "1337", swaps letters for numbers and symbols that look like them — a style that grew out of early internet and gaming culture. This translator converts plain text to leet in a basic or advanced style, can mix styles randomly, and makes a best-effort attempt at turning leet back into text.
How to use this tool
- Type your text.
- Choose a style: basic number swaps, advanced multi-character glyphs, or a random mix.
- Switch to decode to turn leet back into letters.
- Copy the result.
Formula
Basic leet maps a→4, e→3, i→1, l→1, o→0, s→5, t→7. Advanced leet uses shapes like |-| for h and /\ for a. The random style picks among the options for each letter.
Example
"leet" becomes 1337 in the basic style, and "elite" becomes 31173. Decoding 1337 gives "ieet", because 1 is read as i — one reason leet cannot be reversed reliably.
Frequently asked questions
Why can it not always decode?
Many letters share a leet symbol and one letter has several forms, so the mapping is not one-to-one. Decoding guesses the most common letter for each symbol.
What is the difference between the styles?
Basic keeps words readable with simple number swaps. Advanced uses multi-character glyphs that look more cryptic. Random mixes plain, basic and advanced for variety.
Is leet an encryption?
No. It is a stylistic substitution anyone can read, meant for fun and nicknames, not for hiding information.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/leetspeak-translator/
Cite or embed this tool
kakaoCalc. (2026, November 8). Leet Speak Translator (1337). https://kakao.mobile/tools/leetspeak-translator/
“Leet Speak Translator (1337).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/leetspeak-translator/.
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