Why We Built the Case Converter
Retyping a headline to fix capitalization, or cleaning up a database full of mismatched cases, is a small task that eats real time. We built a converter that handles all the common cases in one place — with proper AP-style Title Case, acronym preservation, and accented-character support — so the formatting just works. It's instant, private, and completely free with no signup.
Convert Your Text in Three Steps
Paste or type your text into the input box. Choose a mode — UPPERCASE, lowercase, Sentence case, Title Case, tOGGLE, or aLtErNaTiNg case — and the text transforms instantly, with no submit button. Check the result for proper nouns and acronyms, then copy it with one click and paste it into your email, document, CMS, or spreadsheet. Everything runs in your browser.
Common Mistakes to Avoid
❌ Setting whole documents in UPPERCASE
✓ Solution:
ALL CAPS is harder to read and reads as shouting online — email subject lines in caps often see noticeably lower open rates. Reserve uppercase for acronyms and short emphasis, and use Sentence case or lowercase for body text.
❌ Applying inconsistent Title Case
✓ Solution:
Manually capitalizing headlines leads to a mix of styles across your content. Use Title Case mode, which follows AP rules and keeps short articles, conjunctions, and prepositions lowercase unless they're the first or last word, so every headline matches.
❌ Expecting Sentence case to fix proper nouns
✓ Solution:
Sentence case only capitalizes the first word of a sentence, so names and places stay lowercase — "jane lives in new york" won't auto-correct to "New York." For text with proper nouns, use Title Case or fix those words manually after converting.
❌ Flattening acronyms
✓ Solution:
A naive converter turns "NASA launches rocket" into "Nasa launches rocket." This tool detects words with two or more consecutive capitals and preserves them, but it's still worth a quick check when your text is full of acronyms like FBI or HTML.
❌ Assuming case applies to every language
✓ Solution:
Case conversion only affects scripts that have upper and lower forms, like Latin, Greek, and Cyrillic. Chinese, Japanese, and Arabic text has no case and stays unchanged, so don't expect a visible transformation for those languages.
Frequently Asked Questions
Six core modes: UPPERCASE for acronyms and emphasis, lowercase for normalizing text, Sentence case for standard prose and citations, Title Case for headlines, tOGGLE case which flips every letter, and aLtErNaTiNg case for a meme-style pattern. Each updates instantly as you type or paste.
Sentence case capitalizes only the first word of a sentence, leaving the rest lowercase — ideal for prose and APA/MLA citation titles. Title Case capitalizes major words while keeping short articles, conjunctions, and prepositions lowercase (unless first or last), which suits book titles, headlines, and blog posts.
Yes. It correctly converts accented characters like é→É and ñ→Ñ, preserves punctuation, numbers, and symbols, and leaves emojis untouched since they have no case. It works across Latin-script languages, and non-cased scripts like Chinese or Arabic pass through unchanged.
Following AP style, it keeps articles (a, an, the), short conjunctions (and, but, or), and short prepositions (at, by, in, of, on, to, with) lowercase — except when they're the first or last word. So you get "A Tale of Two Cities" and "Gone with the Wind" formatted correctly.
Yes on both. It's completely free with no signup, watermarks, or premium tiers, and you can convert unlimited text up to 100,000+ characters. All processing happens locally in your browser, so your text is never uploaded, stored, or tracked — safe for sensitive documents.
Case Converter: Change Text to UPPERCASE, lowercase, Sentence & Title Case Instantly — Free & Private
The Case Converter changes the capitalization of any text between six-plus formats the instant you type or paste it. Switch between UPPERCASE for acronyms and emphasis, lowercase for normalizing messy input, Sentence case for standard prose and citations, Title Case for headlines, and the playful tOGGLE and aLtErNaTiNg modes for novelty formatting and memes.
It handles the details that trip up simple converters. Smart Title Case follows AP style, capitalizing major words while keeping short articles, conjunctions, and prepositions lowercase — so you get "The Lord of the Rings," not awkward over-capitalization. It preserves acronyms like NASA, correctly converts accented characters such as é, ñ, and ü, and leaves emojis and non-cased scripts untouched.
It's built for everyday text cleanup: fixing accidental caps in emails, formatting WordPress and YouTube titles, standardizing inconsistent database entries like "nEW yORK," and preparing academic citations in the right style. It works with large blocks of 100,000+ characters, runs entirely in your browser so your text never leaves your device, and lets you copy the result in one click. No signup, no watermarks, completely free.
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