Free Online Case Converter
Switch text between upper, lower, title and sentence case.
Reformatting text case by hand is tedious and error-prone. The ToolVerse AI Case Converter instantly transforms any text you paste into UPPERCASE, lowercase, Title Case or Sentence case, ready to copy back into your document, email or code.
It converts text between different capitalization styles — UPPERCASE, lowercase, Title Case, Sentence case, and camelCase or snake_case for developers — instantly, without retyping anything by hand.
Who should use this tool: Writers and editors formatting headlines and titles, developers converting variable names between naming conventions, students formatting essay titles correctly, and anyone who's pasted text in the wrong case and needs a fast fix.
Quick Start
- Paste or type your text into the box.
- Click UPPERCASE, lowercase, Title Case or Sentence case to transform it.
- Click Copy to copy the converted text.
- Paste the result wherever you need it.
Why People Use Online Case Converter
Once you've used Online Case Converter a few times this is obvious, but first-timers usually miss this: Fix accidentally capitalised text quickly.
- Fix accidentally capitalised text quickly.
- Standardise headings and titles across documents.
- Save time formatting long passages of text.
Key Features
Nothing here requires setup, though this is easy to overlook on a first pass: Four common case styles in one click.
- Four common case styles in one click.
- Title Case capitalises the first letter of every word.
- Sentence case capitalises the first letter after sentence-ending punctuation.
- One-click copy to clipboard.
One caveat
A Few Gotchas
- Converting case on text that contains intentional branding capitalisation. Some brand names or acronyms rely on specific capitalisation (like 'iPhone' or 'eBay'). Blanket case conversion can break these; review and manually fix proper nouns afterward.
- Using Title Case rules inconsistently with style guide requirements. Different style guides (AP, Chicago) have different rules about which small words to capitalise in a title. Check the converted output against your specific style guide if precision matters.
- Forgetting sentence case doesn't auto-capitalise every proper noun. Automated sentence case converts the first letter of each sentence but won't necessarily capitalise proper nouns appearing mid-sentence; review the output for names and places.
On the Job
- Fixing accidental caps lock text: Instantly convert a message accidentally typed in all caps back into normal sentence case.
- Formatting headlines and titles: Convert a draft headline into proper Title Case following standard capitalization rules for articles and blog posts.
- Developer naming convention conversion: Convert a variable name from camelCase to snake_case (or vice versa) when working across codebases with different style conventions.
- Cleaning up pasted data: Normalize inconsistent capitalization in a list of names or entries pasted from a spreadsheet or form export.
Small Things That Help
- Check title case exceptions: Standard title case rules typically keep small words like 'a', 'the', and 'of' lowercase unless they start the sentence — verify the output matches your specific style guide.
- Use sentence case for readability in body text: Sentence case (only the first letter capitalized) is generally easier to read for body paragraphs compared to Title Case.
- Double-check acronyms after converting: Automatic case conversion may lowercase acronyms like 'NASA' or 'HTML' — review and manually correct these after conversion.
Common Questions
What's the difference between Title Case and Sentence case?
Title Case capitalises the first letter of every word, which is common for headings, while Sentence case only capitalises the first letter of each sentence, as in normal prose.
Will Title Case capitalise small words like 'and' or 'the'?
This tool capitalises the first letter of every word for simplicity. For publication-style title casing that keeps minor words lowercase, you may want to manually adjust a few words afterward.
Is there a limit to how much text I can convert?
There's no fixed limit, although extremely long text may be slower to process depending on your device.
Does it support camelCase and snake_case for programming?
Yes, in addition to standard text casing options, many case converters include developer-focused formats like camelCase, PascalCase, and snake_case.
Will it correctly capitalize acronyms?
Automatic conversion can't reliably distinguish acronyms from regular words, so acronyms may need manual correction after conversion.
Can I convert an entire paragraph at once?
Yes, you can paste in a full paragraph or document and convert the whole block in one action.
Does title case follow AP or Chicago style rules?
Implementations vary — check the specific output against your required style guide if precise adherence matters for publication.
Is there an undo if I convert the wrong case by mistake?
The tool doesn't overwrite your original text unless you copy the converted output over it — keep your original text until you're satisfied with the result.