Case Converter
Change text to UPPERCASE, lowercase, Title Case or Sentence case in one click. Fix caps-lock mistakes and tidy headings. Works privately in your browser.
What is the Case Converter?
Typed a paragraph with caps lock on, or received a list of names in mixed capitals? This case converter rewrites the capitalisation of any text in one step. Choose UPPERCASE, lowercase, Simple Title Case or Simple sentence case, press Process, and copy the cleaned-up version straight back into your document, spreadsheet or CMS, or download it as a text file.
The conversion uses standard Unicode case rules, so accented letters such as é and É are handled correctly, and special cases like the German ß become SS in uppercase. Title and sentence modes follow simple, predictable rules rather than a style guide, which keeps results consistent and easy to review. You can paste text or load a local text file, a live character count shows how much you have entered, and all processing stays in your browser.
How to use the Case Converter
- Paste or type your text into the Text box, or press Open a text file to load a local .txt, .csv, .json, .md, .html, .xml or .log file of up to 5 MB.
- Pick a style from the Case rule list: UPPERCASE, lowercase, Simple Title Case or Simple sentence case.
- Press Process to convert the text.
- Check the converted text in the result area, especially names, acronyms and brand names.
- Press Copy result to use the text elsewhere, Download to save it as converted-text.txt, or Reset to start again.
Features
- Four case styles: UPPERCASE, lowercase, Simple Title Case and Simple sentence case.
- Unicode-aware casing that correctly converts accented and non-English Latin letters.
- Title case capitalises the first letter after every space or line break.
- Sentence case capitalises the start of the text and the first letter after a full stop, question mark or exclamation mark followed by a space.
- Keeps all spacing, punctuation, numbers and line breaks exactly where they were.
Why use this case converter
- Fixes caps-lock accidents without retyping a single word.
- Gives headings, product names and list items a consistent look in seconds.
- Prepares text for systems that expect all-uppercase or all-lowercase values.
- Keeps private text on your own device, with a one-click download of the result.
How it works
Upper/lower use Unicode case mappings. Title case capitalizes letters after whitespace; sentence case capitalizes the start and letters after punctuation followed by whitespace.
Examples
Simple Title Case
Input: hello world. welcome back! (Case rule: Simple Title Case)
Result: Hello World. Welcome Back! Unicode default casing; title/sentence modes are simple rules, not linguistic or editorial analysis.
Simple sentence case
Input: hello world. welcome back! (Case rule: Simple sentence case)
Result: Hello world. Welcome back! Unicode default casing; title/sentence modes are simple rules, not linguistic or editorial analysis.
Uppercase with a special letter
Input: Straße (Case rule: UPPERCASE)
Result: STRASSE Unicode default casing; title/sentence modes are simple rules, not linguistic or editorial analysis.
Results are estimates for general information, not financial, medical, legal, tax, or property advice. Confirm important figures with the relevant institution or a qualified professional.
Case Converter: frequently asked questions
Does title case follow AP, Chicago or APA rules?
No. Simple Title Case capitalises the first letter after every space, including short words like and, of and the. It does not know which words a style guide keeps lowercase. If you are writing a headline for publication, convert the text first and then lowercase the minor words your style guide requires by hand.
Why did my acronym or brand name change?
Title and sentence modes first make the whole text lowercase and then capitalise selected letters. That means words with intentional capitals inside them lose those capitals: iPhone becomes Iphone in title case, and NASA becomes Nasa. Review proper nouns, acronyms and product names after converting, and fix them manually where the original capitals matter.
How does sentence case find the start of a sentence?
It capitalises the first letter of the text and any letter that follows a full stop, exclamation mark or question mark plus at least one space. Everything else is lowercased. Because it relies on punctuation, abbreviations such as e.g. followed by a space may trigger an unwanted capital, and a new line without ending punctuation will not start with a capital.
Does it work with accented letters and other languages?
Yes, for scripts that have upper and lower case. It uses Unicode default case mappings, so école becomes École and Straße becomes STRASSE in uppercase. Scripts without letter case, such as Devanagari, Chinese or Arabic, pass through unchanged. Language-specific rules, like the Turkish dotted and dotless i, are not applied.
Will it change my spacing or punctuation?
No. Only the case of letters changes. Spaces, tabs, line breaks, numbers, punctuation and symbols are left exactly as you entered them, so a list stays a list and paragraphs stay separate. If you also want to tidy extra spaces, run the text through a whitespace cleaner before or after changing the case.