Case Converter
Convert text between uppercase, lowercase, title case, camelCase, snake_case, and more instantly
Introduction
Got text in ALL CAPS that needs fixing? Or need to convert variable names between camelCase, snake_case, and kebab-case for different programming languages? Or maybe you just need to format a title properly? This Case Converter tool transforms text between 8 different formats instantly: UPPERCASE, lowercase, Title Case, Sentence case, Alternating Case, camelCase, snake_case, and kebab-case. Everything happens in your browser—your text stays on your device the whole time. No sign-up, no file upload, no waiting. Whether you're a developer switching between naming conventions, a writer formatting headings, or someone cleaning up data with inconsistent capitalization, this tool saves you from manual retyping. JavaScript and Java developers typically use camelCase for variables. Python and Ruby folks use snake_case. CSS class names and URLs use kebab-case. Writers use Title Case for headings. If someone typed something in all caps and it needs fixing, lowercase or Sentence case will clean it up instantly. Pick the format you need, and the text converts in real-time as you type or paste. Copy the result with one click when you're done.
Who Should Use This Tool?
- Software developers and programmers who need to convert variable names, function names, and identifiers between different naming conventions when working across multiple programming languages (camelCase for JavaScript/Java, snake_case for Python/Ruby, kebab-case for CSS)
- Web developers and designers creating SEO-friendly URLs, CSS class names, and file names that require consistent kebab-case or snake_case formatting throughout their projects
- Content writers, bloggers, and editors who need to format article titles, blog post headings, and content sections with proper Title Case or Sentence case capitalization
- Data analysts and database administrators cleaning up imported CSV files, Excel spreadsheets, or database entries where capitalization is inconsistent and needs standardization for matching and sorting
- Social media managers creating posts that require specific text formatting—UPPERCASE for announcements, Title Case for professional content, or alternating case for engagement-focused posts
- Technical writers and documentation specialists who need to convert code examples, API references, and technical terms between different naming conventions when writing tutorials and guides
- Students and researchers formatting academic papers, research titles, and citations that require specific capitalization rules according to style guides (APA, MLA, Chicago)
- Marketing professionals and copywriters who need to quickly test different text formats for headlines, ad copy, campaign names, and brand messaging to find the most impactful presentation
- Product managers and UX designers standardizing interface labels, button text, menu items, and form fields across applications to maintain consistent capitalization throughout the user experience
- SEO specialists and digital marketers optimizing meta titles, descriptions, URL slugs, and keyword formatting to improve search engine visibility and click-through rates
How This Tool Works
The Case Converter tool uses JavaScript string manipulation methods to transform text between different capitalization formats. When you enter or paste text into the input field, the tool stores it and waits for you to select a conversion format. For UPPERCASE conversion, the tool applies the toUpperCase() method to transform all alphabetic characters to capital letters while preserving numbers, punctuation, and special characters. For lowercase conversion, toLowerCase() converts all letters to lowercase. Title Case conversion splits the text into words, capitalizes the first letter of each word using charAt(0).toUpperCase() combined with slice(1).toLowerCase() for the remaining letters, then joins them back together. Sentence case works similarly but only capitalizes the first letter after sentence-ending punctuation (periods, question marks, exclamation points). Alternating Case iterates through each character and alternates between uppercase and lowercase for consecutive letters. For programming formats, the tool takes a different approach: camelCase removes all spaces and special characters, splits on word boundaries, capitalizes the first letter of each word except the first, and joins them together. Snake_case replaces spaces with underscores and converts to lowercase, while also removing special characters that would be invalid in programming identifiers. Kebab-case follows the same process but uses hyphens instead of underscores. All conversions happen client-side in your browser using pure JavaScript, with no server processing or data transmission. The converted text appears instantly in the output area along with a character count, and you can copy it to your clipboard with a single button click.
Try Case Converter Now
Use the interactive tool below to get instant results
Privacy First
Your text is converted entirely in your browser. Nothing is sent to any server or stored anywhere.
Choose Conversion Type
Examples
How to Use Case Converter
Enter Your Text
Type or paste whatever text you need to convert. Could be a single word, a paragraph, or a whole document. The tool keeps line breaks (except for programming formats like camelCase, snake_case, and kebab-case, which remove spaces and breaks on purpose to make valid code identifiers).
Pick a Format
Click one of the 8 buttons: UPPERCASE (all capitals), lowercase (all lowercase), Title Case (First Letter Of Each Word), Sentence case (First letter of sentences), aLtErNaTiNg CaSe (alternating letters), camelCase (likeThis for JavaScript), snake_case (like_this for Python), or kebab-case (like-this for URLs and CSS).
See the Result
The converted text shows up right away with a character count. No delay. Try a few formats if you want—takes one click to switch.
Copy or Clear
Hit the Copy button to grab the converted text for pasting wherever you need it. When you are done, hit Clear to reset everything and convert something new.
Use Cases for Case Converter
Converting Variable Names for Different Languages
Writing JavaScript or Java code? Use camelCase (myVariableName). Working in Python or Ruby? Use snake_case (my_variable_name). Building CSS classes or URLs? Use kebab-case (my-class-name). Switching between languages means switching naming conventions, and this tool makes it instant instead of retyping everything by hand.
Fixing Titles and Headings
Got a blog post title or article heading that needs proper Title Case? Or maybe someone wrote a heading in all lowercase and it looks unprofessional? Convert it to Title Case or Sentence case in one click instead of manually capitalizing each word.
Cleaning Up Data
Importing CSV files or cleaning up database entries where the capitalization is all over the place? Convert everything to uppercase or lowercase to make matching and sorting easier. Helps with deduplication too since "Apple" and "apple" will not match otherwise.
Social Media Posts
Need to make an announcement stand out? Convert it to UPPERCASE. Want something quirky for engagement? Try aLtErNaTiNg CaSe. Or just format hashtags and captions consistently so they look intentional, not random.
File Names and URLs
Creating SEO-friendly URLs or naming files for a project? Kebab-case (like-this) is the standard for URLs and many file systems. Snake_case (like_this) is common for programming files. Instead of manually replacing spaces with hyphens or underscores, just convert the text and copy it.
Key Features
Works in Your Browser
Everything happens on your device. No uploads, no server processing, no storing your text anywhere. Your data stays yours.
Eight Formats in One Tool
UPPERCASE, lowercase, Title Case, Sentence case, Alternating Case, camelCase, snake_case, and kebab-case all in one place. No need to hunt down separate tools for each format.
Instant Conversion
Click a button and see the result right away. No waiting, no delays. Try multiple formats in seconds to find the one that works.
One-Click Copy
Hit the Copy button and the converted text goes straight to your clipboard. Paste it wherever you need it without manually selecting anything.
Keeps Line Breaks (Mostly)
UPPERCASE, lowercase, Title Case, Sentence case, and Alternating Case keep your line breaks and paragraph structure. Programming formats (camelCase, snake_case, kebab-case) remove spaces on purpose to create valid code identifiers.
No Sign-Up Needed
Works in any browser right now. No downloads, no accounts, no setup. Just open the page and start converting.
Frequently Asked Questions
Does this tool save or store my text anywhere?
Nope. Everything happens in your browser. Your text never leaves your device and nothing gets uploaded or stored anywhere. Safe to use for whatever you need to convert.
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every word (The Quick Brown Fox). Good for headings and titles. Sentence case only capitalizes the first letter after periods, question marks, or exclamation points (The quick brown fox. Another sentence here.). Matches how normal writing works.
When should I use camelCase vs snake_case vs kebab-case?
JavaScript, Java, and C# devs use camelCase for variables and functions (likeThis). Python, Ruby, and database folks use snake_case (like_this). URLs, CSS classes, and file names use kebab-case (like-this). It depends on what language or system you are working with.
Does the tool keep line breaks?
Yes for UPPERCASE, lowercase, Title Case, Sentence case, and Alternating Case. Those keep your original line breaks and structure. But camelCase, snake_case, and kebab-case remove spaces and line breaks on purpose because programming identifiers cannot have those.
Can I convert text with numbers, punctuation, or special characters?
Yes. UPPERCASE, lowercase, Title Case, Sentence case, and Alternating Case keep all numbers, punctuation, and special characters—they just change letter case. Programming formats (camelCase, snake_case, kebab-case) strip out special characters and spaces because code identifiers do not allow them.