Leet Speak Translator
Convert text to leet speak (1337) and decode it back. Translate normal text into l33t with basic or advanced symbol substitution, instantly and free.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
How the Leet Speak Translator Works
Leet speak (from “elite”, written 1337) swaps ordinary letters for numbers and symbols that look similar. This translator works in both directions:
- Text → Leet (encode): each letter is replaced by its leet character using a lookup map.
- Leet → Text (decode): the same map is reversed to turn numbers and symbols back into letters.
The result updates live, so you can watch your text transform as you type.
Basic vs Advanced
| Letter | Basic | Advanced |
|---|---|---|
| a | 4 | 4 |
| e | 3 | 3 |
| i | 1 | 1 |
| o | 0 | 0 |
| s | 5 | 5 |
| t | 7 | 7 |
| b | b | 8 |
| g | g | 6 |
| z | z | 2 |
Basic keeps your text readable by only swapping the six most common letters. Advanced substitutes more letters for a denser, more authentic l33t look.
Worked Example
Encode the phrase “elite hacker” in basic mode:
- e → 3, l → l, i → 1, t → 7, e → 3 → 3l173
- h → h, a → 4, c → c, k → k, e → 3, r → r → h4ck3r
Result: 3l173 h4ck3r.
Paste that back into the decoder and you recover elite hacker.
A Note on Decoding
Because some leet characters are ambiguous — 1 can stand for i or l, and 5 for s — perfect round-tripping is not guaranteed. The decoder chooses the most common letter for each symbol, so heavily stylised leet may occasionally need a small manual correction. For fun, gaming tags and usernames, that is rarely a problem.
Frequently asked questions
What is leet speak?+
Leet speak, also written l33t or 1337, is an internet style that replaces letters with similar-looking numbers and symbols. For example, 'elite' becomes '3l1t3'. It originated in 1980s bulletin-board and hacker culture and is still used in gaming, usernames and online forums.
How does the leet speak translator work?+
In encode mode it swaps each letter for its leet character using a substitution map, such as a to 4, e to 3, i to 1, o to 0, s to 5 and t to 7. In decode mode it applies the reverse map to turn leet text back into readable letters.
What is the difference between basic and advanced leet?+
Basic leet only swaps the most common letters (a, e, i, o, s, t) for numbers, keeping text easy to read. Advanced leet substitutes more letters and uses extra symbols, such as b to 8, g to 6 and z to 2, producing heavier, harder-to-read l33t.
Can leet speak be decoded perfectly?+
Mostly, but not always. Some leet numbers map to more than one letter, for example 1 can mean either i or l. The decoder picks the most common interpretation, so heavily stylised or ambiguous leet may need a quick manual fix after decoding.
Where is leet speak used today?+
Leet appears in gaming tags and clan names, online usernames, passwords (though it adds little real security), memes and casual chat. It is mostly used for fun and style rather than genuine secrecy, since it is easy to read once you know the substitutions.