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Case converter

Convert text to uppercase, lowercase, title case, or simple sentence case, then copy or download the result.

Processed on your device

How it works & useful details

How to use this tool

Paste text and select a case style. Spacing, punctuation, and original line endings remain in place.

How the result is calculated

Uses default Unicode case mappings, not locale-specific Turkish or other language rules. Title case lowercases every word then capitalizes its first character, including small words. Sentence case lowercases everything, then capitalizes the next letter at the start and after . ! or ?. It cannot recognize abbreviations, names, acronyms, or grammatical sentence boundaries.

Words are runs of Unicode letters or numbers, with combining marks and internal straight or curly apostrophes. Hyphens split words. Text is NFC-normalized for counting; Chinese and Japanese runs are not dictionary-segmented.

Up to 500,000 UTF-16 code units per input. Text stays on your device.