

Leet Speak replaces letters with visually similar digits or character groups: a → 4, e → 3, o → 0, or m → /\/\. Decoding is not always unique: 1 may mean i or l, while 2 may mean z or r.
The decoder therefore parses variable-length symbols and ranks several candidates when a sequence is ambiguous. Select an alternative candidate to place it in the output field.
Level 1 produces readable substitutions suited to nicknames. Levels 2 and 3 use increasingly complex character groups. Leet is not secure encryption: it is a visual transformation and should never be used to protect sensitive information.
p455w0rdh4ck3r3l173Leet Speak replaces letters with similar-looking symbols. Decoding must allow several possible answers: 1 may represent i, l or a literal digit. Ranked candidates are interpretations rather than a single guaranteed plaintext.
hacker → h4ck3rpassword → p455w0rdNo. It is an easily recognizable visual substitution with no secret key or cryptographic security.
The same symbol can represent several letters and compound symbols can have different lengths.
They control substitution complexity, from common digit replacements to multi-character shapes.