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Convert text to and from leet speak (1337). Encode with Basic, Full, or Caps styles, or decode leet back to plain text.
Details
Convert text to and from leet speak (1337) — the gamer/hacker substitution alphabet that swaps letters for numbers and symbols.
Two actions:
hacker → h4ck3r.h4ck3r → hacker. The decoder is tolerant: it reverses every substitution it knows and passes unknown characters through unchanged, so partially-leeted or mixed text still decodes sensibly.Encode styles:
a→4, e→3, i→1, l→!, o→0, s→5, t→7. Stays legible and is the most widely understood.b→|3, k→|<, m→/\/\, n→|\|, etc.). Much denser and harder to read; the authentic "script kiddie" look.A→4, E→3), on top of the basic set. Good when your input is ALL CAPS.Good to know:
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
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Tool usage guide
The Leet Speak Converter allows you to easily translate plain text into 1337 speak and decode leet speak back into readable English. With support for Basic, Full, and Caps encoding styles, you can customize the level of character substitution for gaming handles, passwords, or creative text styling.
Background
An online gamer wants to create a stylized handle 'leet speak' for a new gaming profile that is still readable.
Problem
Standard text looks too plain, but overly complex symbols make the tag unreadable.
How to use
Input 'leet speak' into the text area, set the action to 'encode', and select the 'basic' style.
Action: Encode, Style: BasicOutcome
The text is converted to '!337 5p34k', which is stylized yet easy to read.
Background
A tech enthusiast finds an old forum archive containing the message 'h3ll0 w0rld' and wants to quickly translate it.
Problem
Manually translating the numbers back to letters is tedious.
How to use
Paste 'h3ll0 w0rld' into the text area, set the action to 'decode', and run the tool.
Basic style uses simple, readable substitutions like numbers for vowels, while Full style uses complex multi-character symbols for a denser look.
Yes, the decoder is tolerant and reverses common substitutions, including third-party conventions like mapping '1' back to 'l'.
No, characters without leet mappings, such as punctuation, spaces, and emojis, remain completely unchanged.
It uses '!' to prevent collisions with the letter 'i' (which maps to '1'), ensuring the encoded text can be accurately reversed.
Yes, the conversion is performed entirely in your browser, and your text is not sent to any external servers.
Action: DecodeOutcome
The message is instantly decoded back to 'hello world'.