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Convert text case

Unicode uppercase; some characters expand, such as ß → SS.

Paste or type text, then run the task. Editing the input clears the previous result.

Enter text to begin.

Text is processed in this browser and is not uploaded or saved.

Help & FAQs

Change capitalization without retyping. Your original stays visible while you review, copy or download the converted text.

How to convert text

  1. Paste or type the original text.
  2. Choose a conversion and select Convert text.
  3. Compare with the original, then copy or download TXT.

Conversion rules

Uppercase and lowercase use Unicode default rules, independent of the page language. Chinese, Japanese, emoji, whitespace and punctuation remain present. Casing can change length, for example ß becomes SS. No Unicode normalization or whitespace cleanup is applied.

Title mode lowercases each word-like segment then uppercases its first code point. It is a simple rule, not an editorial style guide. Sentence mode lowercases the text then capitalizes the first letter and letters after . ! ? 。！？ or a line break. Abbreviations and proper names need manual review. Inverted case toggles each cased code point, which can expand characters.

Input is limited to 100,000 UTF-16 units and 400,000 UTF-8 bytes with 45-second checkpoints. Upper/lower conversion is one bounded synchronous operation; cancellation takes effect at checkpoints. Output is limited to 300,000 UTF-16 units and 400,000 UTF-8 bytes; case expansion may exceed this budget. TXT contains the actual result as UTF-8.

Common questions

Does title mode follow a publishing style guide?

No. Every word-like segment follows the same first-code-point rule. Acronyms, small words, abbreviations and proper names may need editing.

Will switching language change the casing rules?

No. Casing uses Unicode default rules, not Turkish or other locale-specific casing. Title word segmentation uses English; without Intl.Segmenter it uses Unicode letter/number groups with internal apostrophes.