Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Text & Data / Leet Speak Converter

Turn text into 1337 speak.

Free, no uploads, no sign-up. Runs 100% in your browser.

Each character or word is mapped by fixed rules as you type. Nothing leaves your device.

Input: Text. Output: Text.

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Case Converter: UPPER, lower, Title, camelCase, snake_case, kebab-case and more.
Line Sorter: Sort lines A to Z, naturally, by length or number, reverse or shuffle them.
Diff Checker: Compare text and code side-by-side or inline.
Time Zone Converter: Convert times across zones, keep a world clock and find meeting times that suit everyone.