By Alex Johnson — I spent more time than I'd like to admit manually reformatting variable names when switching between Python and JavaScript projects. snake_case to camelCase, over and over. Building a proper case converter with all eight formats was one of the first tools I added to Virtual Text Tools — and it's become one of the most used. Here's a breakdown of every mode and when to use it.
Got a block of ALL CAPS text you need to convert? Pasted content with random Capitalization that looks unprofessional? Need to format variable names in camelCase or snake_case? A text case converter handles all of this in one click — no manual retyping required.
⚡ Quick answer: Paste your text into Virtual Text Tools → Case Converter, click the conversion you need, and copy the result. Supports 8 case formats.
The 8 case formats explained
Our case converter supports eight different transformations, each useful in different contexts:
When do you actually need a case converter?
Case formatting is more consequential than most people realise. In programming, a variable named UserName is completely different from username — a case mismatch causes runtime errors. Python has over 8 million active developers who use snake_case by convention (PEP 8), while JavaScript has over 17 million developers who use camelCase by convention. Getting the case wrong breaks code compatibility entirely.
More often than you'd think. Here are the most common real-world scenarios:
Cleaning up imported or pasted text
Text copied from PDFs, old documents, or certain websites often comes with weird capitalization — random CAPS in the middle of sentences, or everything in lowercase with no sentence structure. Sentence case or Title Case fixes this instantly.
Formatting code variable names
Developers frequently need to convert between naming conventions. A field named "first name" in plain English becomes firstName in JavaScript (camelCase), first_name in Python (snake_case), or first-name in CSS (kebab-case). Converting manually is error-prone on longer strings. For dedicated conversion between these, see the camelCase to snake_case converter.
Writing headlines and titles
Title Case is notoriously tricky — small words like "a", "an", "the", "and", "but", "or" should stay lowercase unless they're the first word. Our Title Case converter handles these rules automatically.
Fixing accidental Caps Lock text
Typed an entire paragraph with Caps Lock on? Instead of retyping, paste it in and hit lowercase. Done in two seconds.
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8 case formats. Instant results. No account needed.
Open Case Converter →Case conventions across programming languages
One of the most practical uses of a case converter is reformatting text for use in code. Every major programming language has its own naming conventions, and using the wrong case can cause code to fail entirely or violate style guidelines that are enforced by linters and code review processes.
Python — snake_case
Python's official style guide PEP 8 mandates snake_case for variable names, function names, and module names. Constants use UPPER_SNAKE_CASE. Class names use PascalCase (a variant of Title Case with no spaces). With over 8 million Python developers worldwide, snake_case is one of the most widely used naming conventions in software development.
JavaScript and TypeScript — camelCase
JavaScript uses camelCase for variables and functions, PascalCase for classes and constructors, and UPPER_SNAKE_CASE for constants. With over 17 million JavaScript developers globally, camelCase is arguably the most common naming convention in web development. TypeScript follows the same conventions with additional type definitions in PascalCase.
CSS and HTML — kebab-case
CSS class names, HTML data attributes, and URL slugs use kebab-case. The hyphen separator is used because CSS identifiers cannot contain underscores in some older contexts, and because URLs use hyphens as word separators by convention (Google recommends hyphens over underscores in URLs for SEO reasons).
Database columns — snake_case
SQL databases almost universally use snake_case for column and table names, since SQL is case-insensitive and underscores are the standard word separator. PostgreSQL, MySQL, and SQLite all follow this convention. When mapping database column names to JavaScript object properties, developers frequently need to convert between snake_case (from the database) and camelCase (for JavaScript).
Title Case rules — why it is more complex than it appears
Title Case is not simply capitalizing every word. Standard Title Case rules from the Chicago Manual of Style and the APA Publication Manual specify that certain words should remain lowercase unless they are the first or last word of the title:
- Articles: a, an, the
- Coordinating conjunctions: and, but, or, nor, for, yet, so
- Prepositions under 5 letters: at, by, in, of, on, to, up, as
The Virtual Text Tools case converter applies these rules automatically, so "the quick brown fox jumps over a lazy dog" correctly becomes "The Quick Brown Fox Jumps over a Lazy Dog" rather than the naive "The Quick Brown Fox Jumps Over A Lazy Dog."
How to use the case converter
- Go to Virtual Text Tools → Case Converter and click the Case tab
- Paste your text into the left input box
- Click any of the 8 conversion buttons — result appears instantly on the right
- Click Copy result to copy the converted text
- Use Swap to move the result back to the input for further conversions
Frequently asked questions
Does it preserve punctuation?
Yes — punctuation, numbers, and special characters pass through unchanged. Only alphabetic characters are affected by case conversion.
What's the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of most words (used for titles and headings). Sentence case only capitalizes the first letter of the first word in each sentence (used for body text and descriptions).
Does camelCase remove spaces?
Yes. camelCase, snake_case, and kebab-case all remove spaces since they're designed for use in code where spaces aren't allowed in identifiers.
Is there a character limit?
No limit. The converter runs locally in your browser so you can convert documents of any size.
Can I chain conversions?
Yes — use the Swap button to move your output back to the input, then apply another conversion on top of it.