Text & Code
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and 10+ more formats.
Your files stay on your device - processed locally via WebAssembly, never uploaded
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What is the best free case converter online?
OptiPix Case Converter switches text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case instantly in your browser. Unlike convertcase.net, the page is ad-free and your text is never sent to a server.
Embed this tool on your website
Copy this code to add the Case Converter to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/case-converter" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Case Converter by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/case-converter">OptiPix Case Converter</a></p>
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About Case Converter
Last updated: May 2026
OptiPix Case Converter instantly transforms your text between 13 different case formats. Convert to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, aLtErNaTiNg CaSe, and iNVERSE cASE with a single click. The tool shows a live preview of the converted text and preserves your original input so you can try multiple conversions. Copy the result to your clipboard or download it as a .txt file. Character count is displayed for reference. Perfect for developers who need to convert variable names between naming conventions, writers reformatting headings, or anyone who needs quick text transformation. Everything runs in your browser - your text is never sent to any server.
How It Works
Each conversion uses JavaScript string methods - toUpperCase(), toLowerCase(), regex replacements, and character-by-character mapping. The tool first splits input into words (handling camelCase boundaries and separators), then reassembles them in the target format.
Use Cases
- •Convert variable names between camelCase, snake_case, and kebab-case
- •Format headings and titles in Title Case
- •Convert text to UPPERCASE for emphasis or design mockups
- •Generate CONSTANT_CASE names for configuration constants
- •Transform text for social media with aLtErNaTiNg CaSe
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Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
OptiPix Case Converter vs convertcase.net vs caseconverter.com vs TextFixer
| Feature | OptiPix | convertcase.net | caseconverter.com | TextFixer |
|---|---|---|---|---|
| Text sent to a server | Never | Client-side, ad-heavy | Client-side, ad-heavy | Yes |
| Developer cases (camel, snake, kebab) | Yes | No | Partial | No |
| Title Case with stop-words | Yes | Naive capitalization | Naive capitalization | Naive |
| Ads/trackers | None | Heavy | Heavy | Some |
| Works offline | Yes | No | No | No |
Competitor details reflect publicly listed free-tier features and may change.
Case conventions, done correctly
Beyond UPPER/lower, the converter implements the developer naming conventions precisely: camelCase, PascalCase, snake_case, kebab-case, and CONSTANT_CASE, with correct tokenization of existing identifiers - 'XMLHttpRequest' splits into xml/http/request, not x/m/l/http....
Title Case follows publishing convention rather than capitalizing every word: articles, short conjunctions, and prepositions (a, an, the, of, in, on, and...) stay lowercase unless first or last, matching Chicago/AP-style headline expectations rather than the naive Every Word Capitalized output most converters produce.
Sentence case handling is Unicode-aware, so accented and non-Latin characters upper/lowercase correctly (Turkish dotless ı being the classic trap for naive toUpperCase implementations).
Frequently Asked Questions
What case formats are supported?
How does Title Case work?
Is my text sent to any server?
Can I convert variable names between coding conventions?
Does the character count change between cases?
What's the difference between camelCase and PascalCase?
When should I use snake_case vs kebab-case?
Which words stay lowercase in Title Case?
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