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Case Converter
Change text to uppercase, lowercase, sentence case, or title case.
English casing rules are used consistently. Title Case capitalizes words, not a publisher’s style. Review acronyms, proper names, and sentence boundaries.
Start with the original each time. Choose a case, inspect names and abbreviations, and copy the result without replacing your input.
Choose case for the job
Uppercase is useful for short labels. Lowercase can normalize a list. Sentence case capitalizes the first letter and letters after sentence-ending punctuation; it cannot identify every abbreviation or proper noun.
Title case here capitalizes each word. It does not apply a publisher-specific style or preserve acronyms. Review names such as iPhone and technical terms after conversion.
Protect names and abbreviations
Case conversion applies consistent English letter mappings, not editorial judgment. Turning NASA into title case produces Nasa; a brand such as iPhone also needs manual correction.
Sentence case treats punctuation followed by whitespace as a possible new sentence. Abbreviations such as Dr. can therefore capitalize the next word unexpectedly. Always review the result in context.
Example: one original, four outputs
For “don’t STOP. next idea.”, each mode starts from the unchanged input, so switching back and forth does not accumulate edits. English case mappings are used consistently rather than changing with the browser’s preferred locale.
| Mode | Output |
|---|---|
| UPPERCASE | DON’T STOP. NEXT IDEA. |
| lowercase | don’t stop. next idea. |
| Title Case | Don’t Stop. Next Idea. |
| Sentence case | Don’t stop. Next idea. |
Frequently asked questions
Does Title Case follow a style guide?
No. It capitalizes word starts and does not apply special rules for articles, conjunctions, brands, or acronyms.
Can I switch modes without losing the original?
Yes. Each mode starts from the retained input. Clear removes both input and result.
Can changing case change the character count?
Yes. Some Unicode case mappings expand characters, so check a strict length limit again after conversion.