Letter case is one of those small details that changes how writing is perceived. A heading in Title Case looks polished, an email subject in ALL CAPS looks like shouting, and a paragraph that randomly MiXeS cases looks careless. Yet fixing case by hand — retyping a whole paragraph because Caps Lock was on — wastes time and invites new typos. The Case Converter fixes any block of text in a single click.
Students use it to tidy essays and assignments, bloggers and YouTubers to format titles and headlines, office workers to clean up data pasted from PDFs or forms, and developers to normalise labels and messages. It handles four common styles: UPPERCASE, lowercase, Title Case, and Sentence case, covering almost every everyday formatting need.
As with every tool on this site, conversion happens entirely in your browser. Your text is never uploaded or stored anywhere, so drafts, personal notes, and work documents stay private. There is no account to create and no limit to hit — paste, click, and copy the result back where it belongs.
One honest note: Title Case here follows a simple rule — the first letter of every word is capitalised. That is perfect for headings and names, but it will not match every formal style guide, which sometimes keeps small words like ‘and’ or ‘the’ in lowercase. For strict academic or publishing work, give the result a quick once-over.
How it works
Each of the four buttons applies a straightforward text transformation. UPPERCASE converts every letter to its capital form, which suits short warnings, abbreviations, and form fields that demand capitals. Lowercase does the opposite, useful for normalising SHOUTED text or cleaning up data. Title Case capitalises the first letter of every word — ‘the quick brown fox’ becomes ‘The Quick Brown Fox’ — which is the familiar look of book titles and headings.
Sentence case is the subtlest of the four. It lowercases everything first, then capitalises the first letter of the text and the first letter after every full stop, exclamation mark, or question mark — turning ‘hello world. how are you?’ into ‘Hello world. How are you?’ This mirrors how normal sentences look in books and articles, making it ideal for pasting quoted material into prose.
Numbers, punctuation, and symbols are never changed — only letters are affected. The tool also preserves your line breaks and spacing, so a multi-paragraph paste keeps its structure. Because the rules are simple and fixed, the output is fully predictable: the same input always produces the same result.
How to use this tool
- Paste or type your text into the box.
- Click one of the four buttons: UPPERCASE, lowercase, Title Case, or Sentence case.
- The text in the box is converted immediately in place.
- If you picked the wrong style, just click a different button — it converts from the current text.
- Click 'Copy' to copy the converted text to your clipboard.
- Paste it into your document, post, or form.
Practical tips
- Do not use ALL CAPS for long paragraphs — it is harder to read and reads as shouting online.
- After Title Case, check proper nouns and acronyms; the simple rule capitalises every word, which may not suit names like 'iPhone'.
- Use Sentence case when quoting messages into articles so the quote matches your surrounding prose.
- For data cleanup, convert to lowercase first to spot duplicates that differ only by case.
- The tool converts the whole box at once — to change only part of a document, paste just that part.
Frequently asked questions
What is the difference between Title Case and Sentence case?
Title Case capitalises the first letter of every word ('The Quick Brown Fox'), which suits headings and titles. Sentence case capitalises only the first letter of each sentence ('The quick brown fox'), which suits normal prose. Use Title Case for headlines and Sentence case for body text.
Will Title Case match official style guides like APA?
Not exactly. Formal guides like APA or Chicago keep small words such as 'and', 'the', and 'of' in lowercase within titles, while this tool capitalises every word using a simple rule. The result is fine for most headings, but for strict academic publishing, adjust the small words manually.
Does the converter change numbers or symbols?
No. Only letters A–Z are changed. Numbers, punctuation, currency symbols, and spacing stay exactly as they were, and line breaks are preserved, so structured text keeps its layout.
Is there a limit to how much text I can convert?
There is no built-in limit. Articles, long lists, and multi-page pastes convert instantly because everything runs locally in your browser rather than on a server.
Can I convert just part of my text?
The buttons convert everything in the box. To change only a paragraph or heading, copy just that section into the tool, convert it, and paste it back into your document.
Will it fix randomly mixed case like 'hELLo WoRLD'?
Yes. UPPERCASE, lowercase, and Sentence case all normalise the text first, so mixed-up capitalisation from an accidental Caps Lock press is repaired in one click.