Case Converter
Convert text between uppercase, lowercase, title, sentence and alternating case.
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Preview
All conversion happens in your browser. Your text is never uploaded or stored.
Case Converter
The ToolOS case converter reformats any text in one click. Choose uppercase, lowercase, title case, sentence case or alternating case and copy or download the result. All processing happens in your browser, so your text stays private.
How to use the case converter
- Step 1
Type or paste text
Add the text you want to reformat into the editor.
- Step 2
Choose a case style
Click UPPERCASE, lowercase, Title Case, Sentence case or aLtErNaTiNg cAsE.
- Step 3
Copy or export
Copy the preview or download it as a TXT file.
When to use each case style
UPPERCASE
Great for emphasis, headings, acronyms and short notices.
lowercase
Use for casual copy, code variables and relaxed messaging.
Title Case
Best for article headlines, product names and navigation labels.
Sentence case
Ideal for paragraphs, descriptions and long-form content.
aLtErNaTiNg cAsE
A playful, meme-style format where letters alternate case.
Frequently Asked Questions
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Coming soon to ToolOS: Text Diff.