Case Converter
Fix text that was typed with Caps Lock on, turn headings into Title Case, or tidy up shouty copy into normal sentences. Paste your text, choose a case, and copy the result.
Paste text into the input box, then click a case button. The converted text appears in the output box, ready to copy.
What is the Case Converter?
The Case Converter changes the capitalisation of text without you retyping it. It is a quick fix for text pasted from emails, spreadsheets or documents that has inconsistent or incorrect capital letters.
What does this tool do?
It offers four conversions. UPPERCASE makes every letter a capital. lowercase removes all capitals. Title Case capitalises the main words of each line while keeping short joining words such as 'and', 'of' and 'the' in lowercase (except at the start). Sentence case lowercases the text and then capitalises the first letter of each sentence.
How to use the Case Converter
- Paste or type your text into the input box.
- Click UPPERCASE, lowercase, Title Case or Sentence case.
- Check the result in the output box — you can switch between cases as many times as you like.
- Press Copy to copy the converted text, or Clear to empty both boxes.
Key features
Four common cases
Covers the conversions people need most often for headings, body text and data cleanup.
Sensible Title Case
Small words like 'a', 'an', 'in' and 'of' stay lowercase unless they start the title, which matches common style guides.
Sentence-aware
Sentence case finds sentence starts after full stops, question marks and exclamation marks, and also capitalises a standalone 'i'.
Keeps your line breaks
Paragraphs and lists keep their layout after conversion.
Runs locally
Your text is converted in your browser and never uploaded.
Benefits
- Save time retyping text written with Caps Lock on.
- Make headings and titles consistent across a document or website.
- Clean up names and labels copied from spreadsheets.
- Turn all-caps announcements into easier-to-read sentences.
Practical examples
Caps Lock accident
'PLEASE SEND THE REPORT BY FRIDAY.' becomes 'Please send the report by friday.' with Sentence case — then just fix the proper noun.
Blog heading
'how to plan a week of healthy meals' becomes 'How to Plan a Week of Healthy Meals' with Title Case.
Data cleanup
A column of product codes in mixed case can be made consistent with UPPERCASE before importing into another system.
Who should use this tool?
- Writers and editors formatting headings
- Students tidying up notes and references
- Office workers cleaning up copied text
- Marketers preparing titles and ad copy
- Anyone who accidentally typed with Caps Lock on
Common use cases
- Fixing text typed in all capitals
- Formatting article and email subject lines
- Standardising spreadsheet values
- Preparing headings for presentations
- Converting labels to a consistent style
Important limitations
- Sentence case cannot know which words are names or places, so proper nouns like 'London' or 'Friday' may need to be re-capitalised by hand.
- Title Case follows a general rule set; specific style guides (AP, Chicago, APA) differ on a few small words.
- Acronyms such as 'NASA' will be lowercased by lowercase, Title Case and Sentence case conversions.
- Letters without upper and lower forms, such as in Chinese or Arabic scripts, are left unchanged.
Frequently asked questions
What is the difference between Title Case and Sentence case?
+
Title Case capitalises most words, as in a book title. Sentence case only capitalises the first word of each sentence, as in normal writing.
Which words stay lowercase in Title Case?
+
Short articles, conjunctions and prepositions such as a, an, the, and, but, or, for, of, in, on, at, to and by — unless they are the first word.
Will my line breaks be kept?
+
Yes. The converter only changes letters, so paragraphs and lists keep their structure.
Why did names lose their capital letters?
+
The tool cannot tell names from ordinary words. After using Sentence case, re-capitalise names, places and brands manually.
Is there a length limit?
+
There is no fixed limit. Very long texts depend on your device memory but typical documents convert instantly.
Related tools
Word Counter
Count words, characters, sentences and paragraphs as you type, with an estimated reading time.
Alt Code Check Mark
Find every check mark, tick and cross symbol with its Alt code, Unicode and HTML entity. Click any symbol to copy it instantly.
JSON Formatter and Validator
Beautify, minify and validate JSON with clear error messages pointing to the exact line and column.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to readable text — with full Unicode and URL-safe support.
Page Size Checker
Check how heavy any web page is. See the total size, the largest files and what is slowing it down.