Case Converter
Simultaneous Conversion Preview
Usage Tips
Convert text into the format your document or code needs
Use it when you need to clean up English text into uppercase or lowercase, or convert variable names and file names into developer-friendly formats like camelCase, snake_case, and kebab-case. Before copying the result, check that spaces, special characters, and word boundaries are formatted the way you want.
What is Case Converter?
The Case Converter is an online string-transformation tool that converts text between standard capitalization styles (UPPERCASE, lowercase, Sentence case) and developer-friendly coding conventions (camelCase, snake_case, PascalCase, kebab-case). It simplifies text normalization, naming conventions, and programming syntax cleanup, eliminating manual typing errors in documentation and development.
How to Use
- 1Paste or type your source English text into the input panel.
- 2Click the conversion style button corresponding to your target format (e.g., camelCase, snake_case, PascalCase, kebab-case).
- 3Review the processed output generated in real-time in the output field.
- 4Confirm that boundaries around numbers, punctuation, and abbreviations are correctly structured.
- 5Click the copy button to transfer the formatted text directly into your code editors, documentation, or databases.
Choose a naming convention for the destination
Last reviewed: July 11, 2026Case and separator conversion
Find word boundaries, then reposition capitalization and separators according to the selected rule
camelCase and PascalCase mark boundaries with capitalization, while snake_case and kebab-case use underscores or hyphens.
Converting hello world into naming styles
- β’ Input: hello world
- β’ Compare camelCase, PascalCase, snake_case, and kebab-case
- β’ Choose based on variable, class, database, or URL usage
- 1. camelCase β helloWorld
- 2. PascalCase β HelloWorld
- 3. snake_case β hello_world; kebab-case β hello-world
The outputs are helloWorld, HelloWorld, hello_world, and hello-world for the four selected styles.
How to read the result
- camelCase is common for JavaScript variables, while PascalCase is common for classes and components.
- snake_case fits database fields, and kebab-case fits CSS classes and URL paths.
Conditions that change the result
- Scripts without letter casing, such as Korean or Japanese, do not gain uppercase or lowercase changes.
- Acronyms and numbers can create ambiguous word boundaries, so review the output.
Common input mistakes
- Leaving spaces or uppercase letters in a URL can make path conventions inconsistent.
- Applying a class-name convention to database fields can conflict with project rules.
Reference Knowledge
- βDeveloper Naming Styles:
- β * camelCase: The first word begins with a lowercase letter, and subsequent joined words are capitalized (e.g., totalPrice, handleButtonClick). Highly common in JavaScript.
- β * PascalCase: Every single word starts with a capital letter (e.g., UserCard, DatabaseManager). Commonly used for class declarations or React components.
- β * snake_case: Words are written in lowercase and joined by underscores (e.g., user_account_id, created_at). Preferred in Python variables and SQL databases.
- β * kebab-case: Words are written in lowercase and joined by hyphens (e.g., nav-bar-container, api-v1). Standard for CSS class naming and URL paths.
FAQ
Q.Can the tool clean up multiple erratic spaces or tab offsets?
Yes. The conversion engine acts as a tokenizer, treating consecutive spaces, tabs, and hyphens as temporary delimiters. It strips them clean or converts them to target separators (like underscores or camel caps) based on your selected output case.
Q.Which mode is best for building SEO-friendly URL slugs or CSS classes?
kebab-case is the industry standard. It converts all uppercase characters to lowercase and inserts hyphens between words. Search engine algorithms read hyphens as word separators, which is beneficial for web SEO.
Q.Will this tool convert international scripts or non-English letters?
Character case changes only apply to alphabets with casing properties (like Latin, Cyrillic, or Greek). Languages like Korean, Japanese, or Arabic do not have uppercase/lowercase equivalents and will pass through unchanged.
Q.How are consecutive uppercase acronyms (e.g., JSON, API) converted?
Acronym parsing depends on boundary rules. An acronym like APIRequest might convert to api_request in snake_case, but complex strings may require manual review to ensure the word separations align with your expectations.
