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Change the case, keep the words
On the default text below, Title Case produces “The Quick Brown Fox Jumps Over The Lazy Dog. Make Sentences Shine!” — 12 words, 69 characters. Switch modes to see the others.
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Case Converter
Pasted a headline in ALL CAPS, or a paragraph with no capitalization at all? Pick a case, hit convert, and copy the fixed text — no retyping, no find-and-replace gymnastics.
Which case does what
Case is typography’s tone of voice. UPPERCASE shouts and is best saved for acronyms and short labels. Title Case and Sentence case both suit headings — they just belong to different style traditions. Lowercase is for code, URLs, and hashtags. The two playful modes at the bottom are for memes, not manuscripts.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| UPPERCASE | every letter → A–Z | Shouts. Use for acronyms (NASA, FAQ) and short labels — never body text. |
| lowercase | every letter → a–z | Quiet. Use for URLs, hashtags, code, and filenames. |
| Title Case | first letter of every word → A–Z, rest → a–z | The classic heading style: Every Word Capitalized. |
| Sentence case | first letter of each sentence → A–Z, rest → a–z | Headlines in most journalism and the web’s default sentence look. |
| Capitalize Each Word | first letter of every word → A–Z, rest untouched | Like Title Case but preserves intentional caps (e.g. “iPhone”). |
| aLtErNaTiNg | letters alternate a–z, A–Z | Mocking SpongeBob memes. Deliberately hard to read. |
| iNvErSe | every letter swaps case | Fixes the “oOPS, cAPS lOCK WAS ON” accident in one click. |
Worked example: the default text
Input (lowercase, 12 words, 69 characters): “the quick brown fox jumps over the lazy dog. make sentences shine!”
UPPERCASE → THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG. MAKE SENTENCES SHINE!
Title Case → The Quick Brown Fox Jumps Over The Lazy Dog. Make Sentences Shine!
Sentence case → The quick brown fox jumps over the lazy dog. Make sentences shine!
Words, punctuation, and the exclamation mark all survive — only the letters change case.
The small-word caveat on Title Case
This converter’s Title Case capitalizes every word, including “the,” “and,” and “of.” Real style guides disagree with that: AP and Chicago style keep short articles, prepositions, and conjunctions lowercase (“The Quick Brown Fox Jumps over the Lazy Dog”). If you are formatting for publication, run Title Case first, then lowercase the small words by hand — or use Sentence case, which sidesteps the rule entirely.
Who uses this
- Editors & writers: rescuing pasted text stuck in ALL CAPS or no caps at all.
- Students: fixing caps-lock accidents in essays before submission.
- Marketers: standardizing headlines across title case and sentence case conventions.
- Developers: normalizing strings, labels, and test data between cases.
- Social media managers: consistent capitalization across posts and bios.
Accuracy & limitations
Conversion is exact and character-preserving: punctuation, numbers, emoji, and line breaks pass through untouched. Two honest limits: sentence case splits on . ! ?, so abbreviations like “Dr.” or “e.g.” can trigger a false sentence start — check short text by hand. And Title Case capitalizes every word rather than following AP/Chicago small-word rules (see the caveat above). For very long documents, convert in sections so you can spot-check the results.
Pair it with the word counter to check length after conversion, or the password generator for case-sensitive secrets.
Cite this calculatorBright Side Kit. “Case Converter.” brightoolbox.com, 2026.
Bright Side Kit. "Case Converter." https://brightoolbox.com/case-converter/ Accessed October 22, 2026.Frequently asked questions
Which case should I use for headings — title case or sentence case?
Both are correct; it depends on your style guide. Title Case (“Every Word Capitalized”) is the classic book-title look. Sentence case (“Only the first word capitalized”) is the default for most journalism, academic writing, and the web. Pick one and stay consistent.
Someone sent me text in ALL CAPS. What’s the fastest fix?
Paste it here and run lowercase first, then Title Case or Sentence case — going straight from ALL CAPS to Title Case works too. Two clicks, no retyping.
Does Title Case capitalize words like “the” and “and”?
This converter capitalizes every word. AP and Chicago style guides keep short articles, prepositions, and conjunctions lowercase (“over the Lazy Dog”). For published work, run the conversion, then lowercase the small words manually.
What’s the difference between Title Case and Capitalize Each Word?
Title Case lowercases everything except each word’s first letter. Capitalize Each Word uppercases each word’s first letter but leaves the rest exactly as typed — so “iPhone” stays “iPhone” instead of becoming “Iphone.”
What is iNvErSe case good for?
The classic rescue: text typed with caps lock accidentally on (“oOPS, cAPS lOCK WAS ON” becomes “Oops, Caps Lock Was On” — then run Sentence case for the finishing touch). It is also a meme format.
Does the converter change my punctuation or line breaks?
No. Punctuation, numbers, emoji, spaces, and line breaks pass through untouched — only letter case changes.
Is there a text length limit?
The converter handles long documents, but the share link only carries the first 120 characters of pasted text. For long documents, convert in sections or bookmark the page.
Is my text sent to a server?
No. Conversion runs entirely in your browser’s JavaScript — your text never leaves your device.