Leetspeak (1337) Converter
Translate text into leetspeak and decode 1337 back to letters, in your browser.
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.
About this tool
ShowHide
Turn ordinary text into leetspeak — the old hacker and gamer style where letters are swapped for look-alike digits — or switch to decode mode and read 1337 back as letters. The basic set replaces the six most recognisable letters, a, e, i, o, s and t, and stays easy to read at a glance; the advanced set adds b, g and z for a denser look. Decoding is the direction to watch, because the mapping only runs one way: every digit becomes a letter, so real numbers in your text are translated too and 2026 comes back as zozg. Encode then decode returns your letters, but a passage mixing words and figures will not survive the round trip intact. Everything runs locally — nothing is uploaded.
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.
Does encoding then decoding always return my original text?
Only if it had no digits to begin with. Decoding maps every digit back to a letter, so a year, a house number or a version string that survived encoding untouched comes back as letters — 2026 decodes to zozg. Round-tripping is safe for prose and lossy for anything with figures in it.
Is leetspeak any use for hiding text?
No. The substitutions are a fixed, public table of nine characters, so anything written in it is decoded by this page in one click and by a search engine automatically. It is a style, not obfuscation, and a password built by leetifying a dictionary word is one a cracking tool tries first.
Related tools
Braille Translator (Text ↔ Braille)
Translate text to Unicode Braille (Grade 1) and decode Braille back to text, with capital and number signs, in your browser.
Text
Morse Code Translator
Convert text to and from international Morse code. Supports A-Z, 0-9, punctuation. Customizable letter and word separators.
Text
Fullwidth Text Generator (Vaporwave / Aesthetic)
Convert text to fullwidth ﾑﾑﾗ for that vaporwave aesthetic look, and back again, in your browser.
Text
Bionic Reading Converter
Convert any text into bionic reading format — first letters of each word bolded as fixation points to help your eyes glide faster through long passages.
Text
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words.
Text
Fancy Unicode Text
Type plain ASCII and get 𝐁𝐨𝐥𝐝, 𝐼𝑡𝑎𝑙𝑖𝑐, 𝓢𝓬𝓻𝓲𝓹𝓽, 𝔉𝔯𝔞𝔨𝔱𝔲𝔯, 𝙼𝚘𝚗𝚘 and sans-serif variants from the Unicode Math Alphanumeric blocks.
Text