Case Converter
Instantly convert text into UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and 15+ styles, with live preview, developer formats and text utilities. Free and private.
What is the Case Converter?
A Case Converter is a tool that instantly transforms your text into different letter cases and formatting styles. Toollyz Case Converter supports 15+ styles — UPPERCASE, lowercase, Title Case, Sentence case, Capitalized Case, aLtErNaTiNg and InVeRsE for writing, plus developer formats like camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case and Header-Case. It shows the original and converted text side by side with a live preview, applies developer formats per line so you can batch-convert lists, and includes handy utilities like reverse text, sort lines, strip symbols and normalize spacing. Live statistics, favorites, history and one-click copy or download make it a complete text-formatting workspace — and everything runs privately in your browser.
How to use it
- Type or paste your text into the editor, or drag and drop a .txt file.
- Pick a case style from the conversion panel — the converted result updates instantly beside your text.
- Copy the result, download it as TXT, or apply it back to your source. Star your favorite styles for quick access.
- Use the utilities to reverse, sort, strip symbols or normalize spacing before converting.
Benefits
- 15+ case styles for writing and code, applied in real time.
- Side-by-side original and converted preview with smooth transitions.
- Developer formats (camelCase, snake_case, kebab-case and more) applied per line for bulk lists.
- A developer-formats comparison card showing every naming convention at once.
- Text utilities: reverse, sort A→Z, strip special characters, normalize spacing and clean whitespace.
- Live character, word, line and reading-time stats, plus SEO title and meta length awareness.
- Favorite presets, recent-text history, in-text search highlighting, focus and fullscreen modes.
- One-click copy, TXT download and share — 100% private, with auto-save in your browser.
Frequently asked questions
What is a case converter?
A case converter is an online tool that transforms your text into different letter cases and formatting styles, such as UPPERCASE, lowercase, Title Case, camelCase and snake_case. Toollyz Case Converter updates the result instantly as you type.
Can I convert text to uppercase and lowercase?
Yes. Click UPPERCASE to capitalize every letter or lowercase to make everything small. The original and converted versions are shown side by side so you can compare instantly.
What is camelCase?
camelCase joins words with no spaces and capitalizes the first letter of each word except the first — for example, 'helloWorld'. It's widely used for variable and function names in JavaScript and many other languages.
What is the difference between camelCase and PascalCase?
Both remove spaces and capitalize word boundaries, but camelCase keeps the first letter lowercase ('helloWorld') while PascalCase capitalizes it too ('HelloWorld'). PascalCase is common for class and component names.
What is snake_case used for?
snake_case joins lowercase words with underscores ('hello_world'). It's popular for variable names, database fields and file names in languages like Python and Ruby. kebab-case is the hyphenated version ('hello-world'), often used for URLs and CSS classes.
Can I convert large text blocks?
Yes. Paste long articles, lists or paragraphs and convert them in one click. Developer formats are applied per line, so a list of items each becomes its own camelCase, snake_case or kebab-case value.
Does this work on mobile?
Absolutely. The editor, conversion panel and preview are fully responsive and touch-friendly, with a focus mode for distraction-free editing on any device.
Is my text stored online?
No. All conversions happen entirely in your browser — your text is never uploaded to any server. Your recent text and favorite styles are saved only in your device's local storage.
Can I copy converted text instantly?
Yes. Use the Copy button to copy the converted result in one click, download it as a TXT file, or apply it back to your source text. You can also star your most-used styles for quick access.
Does it support developer formatting?
Yes. Alongside writing cases it supports camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case and Header-Case, with a comparison card that shows your text in every naming convention at once.
Is this case converter free?
Completely free with no signup and no limits. Every style and utility is available to everyone, privately in your browser.