Paste your text, select part of it if you like, and choose a case from the toolbar. Every conversion can be undone, and the word and character counts update at once.
The five cases at a glance
| Button | Result | Typical use |
|---|---|---|
| UPPER | THE STORY OF A LIFE IN TOKYO | Short labels, warnings, acronyms |
| lower | the story of a life in tokyo | Tags, slugs, cleaning pasted caps |
| Title | The Story of a Life in Tokyo | Headlines, book and article titles |
| Capitalize | The Story Of A Life In Tokyo | Names lists, menu items, simple labels |
| Sentence | The story of a life in tokyo | Body text, captions, UI messages |
Convert all text or just a selection
With nothing selected, a button converts the whole editor. Highlight a heading, a line or a single word first and only that part changes; the converted text stays selected so you can see what happened. Each conversion is one undo step, so Ctrl+Z (Cmd+Z on a Mac) restores the original if a result is not what you wanted.
What the converter cannot know
Case rules depend on meaning, and a converter only sees letters. Lowercasing and then capitalizing turns NASA into Nasa and iPhone into Iphone, and sentence case cannot tell that Tokyo or Monday are names. After a conversion, scan the text for:
- acronyms and initialisms such as UN, HTML or BBC;
- brand names with unusual capitals, such as eBay or YouTube;
- proper nouns inside sentence-case text: people, places, days and months;
- the pronoun I, which lowercase conversion changes to i.
Find and Replace in the toolbar fixes repeated cases quickly: search for Nasa with case sensitivity on and replace it with NASA everywhere.
Accented letters and other alphabets
Conversions use your browser's Unicode case mapping, so accented Latin letters (é → É), Greek and Cyrillic convert correctly. The German ß becomes SS in uppercase, as the Unicode rules require. Scripts without case, such as Chinese, Japanese, Arabic or Hebrew, are left unchanged.
Which case should you use?
Pick the case for the job rather than for emphasis. Sentence case is the easiest to read and suits most body text, buttons and notifications. Title case signals a title: use it consistently for every headline on a page or in a document, not for a single line. Capitals work for very short labels, but a whole paragraph in capitals is tiring to read, and screen readers may spell out some all-caps words letter by letter. Lowercase suits tags, file names and web addresses, where consistent case avoids duplicates such as Photo.jpg and photo.jpg.
More specific tools
For headlines, the title case converter explains which short words stay lowercase. For body text pasted in capitals, the sentence case converter explains how sentence starts are detected.