Leet Speak Converter

Convert text to l33t sp34k and back — quick, private and in your browser.

Input text

Preserve case Convert digits

Custom mappings (format: a=>4,b=>8)

Custom mappings override defaults. Use comma-separated list.

Examples

Input: Leet Speak Converter

Basic: L33t Sp34k C0nv3rt3r

Moderate: |_33+ 5p34k C0nv3r7er

Try this sample: Click Load sample text

How it works

Choose a level and press Convert. The tool applies a set of letter/substring replacements to produce leet text. Reverse will attempt a best-effort mapping back to readable text. All processing happens in your browser.