Leetspeak
Convert text into leetspeak by swapping common letters for look-alike numbers: a→4, e→3, i→1, o→0, s→5 and t→7. Both cases are converted. A playful throwback to old-school internet slang.
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Worked example
3l173 h4ck3r
Frequently asked
Which letters change?
a, e, i, o, s and t (and their capitals) become numbers.
Is it reversible?
Roughly — but since case is lost on swapped letters, it's not a clean round-trip.