Case Converter

Case Converter is a free online tool that instantly transforms text between the most common casing formats used in programming and writing. Whether you need to convert a sentence to camelCase for a JavaScript variable, snake_case for a Python function, or simply toggle between uppercase and lowercase, this tool handles it all in one place without any setup or installation.

For developers, consistent naming conventions are critical for readable, maintainable code. Manually reformatting variable names, API keys, or copied content is tedious and error-prone. This tool eliminates that friction by automating case transformations, making it especially useful when working across codebases with different style guides, renaming bulk identifiers, or preparing text content for display in a UI.

Using the Case Converter is straightforward: paste or type your text into the input field, then select the desired output format from the available options — such as UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, or CONSTANT_CASE. The converted result appears instantly in the output area, ready to copy with a single click.

The tool processes the full input as a block of text and applies the selected transformation to every word or token accordingly. For multi-word conversions like camelCase or snake_case, word boundaries are detected from spaces, existing casing breaks, or punctuation, so inputs like 'hello world', 'Hello World', or 'helloWorld' will all produce consistent results.

Keep in mind that some edge cases require attention: abbreviations and acronyms (e.g. 'API', 'URL') may be lowercased when converting to camelCase or snake_case, and special characters or numbers are generally preserved in place. Always review the output when working with domain-specific terminology or strings that mix symbols and letters.