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Case Converter

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Uppercase to Lowercase Converter

Convert uppercase letters to lowercase or lowercase to uppercase instantly with this free text case converter. Change text to sentence case, title case, proper case, camelCase, PascalCase, snake_case, or kebab-case for writing, headings, usernames, and code.

Words: 0 Characters (All): 0 Chars (No Spaces): 0 Sentences: 0 Lines: 0

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Free Online Text Case Converter for Every Format

Use this free text case converter to change uppercase to lowercase, lowercase to uppercase, and ordinary text into title case or sentence case. It also supports camelCase, PascalCase, kebab-case, snake_case, and UPPER_SNAKE_CASE for developers. Paste your text, choose a format, and copy or download the result. Conversions run in your browser, so your text does not need to be uploaded to a server.

Convert Text for Writing, Headlines, and Code

Choose uppercase for capital letters, lowercase for small letters, title case for headings, or sentence case for paragraphs. Developers can convert identifiers such as user_first_name to userFirstName or UserFirstName, and format words with hyphens or underscores. The tool also includes text cleanup and additional case styles for everyday editing.

Free, Private, and Easy to Use

The converter is free to use on desktop and mobile. Text transformations happen locally in your browser, without an account or a paid subscription. For sensitive information, avoid using shared devices and clear the text field when you finish.

Text Case Converter FAQs

How do I convert uppercase text to lowercase?

Paste your text into the converter and choose the lowercase option. You can also change lowercase text to uppercase or use title case and sentence case.

What is the difference between title case and sentence case?

Title case capitalizes the main words in a heading, while sentence case normally capitalizes the first word and proper nouns. Exact title-case conventions can differ by style guide.

Can I convert text for programming?

Yes. The converter includes common developer formats such as camelCase, PascalCase, kebab-case, and snake_case.

Is this online case converter free?

Yes. You can convert text in your browser without installing a separate application.

How to Use an Online Text Case Converter

Paste or type your text into the editor, then choose the format you need. Use UPPERCASE for headings, lowercase for normal text cleanup, Sentence case for readable sentences, and Title Case for titles. Developers can also convert identifiers to camelCase, PascalCase, snake_case, kebab-case, or CONSTANT_CASE.

Which text format should you choose?

  • Sentence case: Capitalizes the start of sentences for general writing.
  • Title Case: Helps format article titles and headings; check your preferred style guide for small words.
  • camelCase: Common for JavaScript variables such as userName.
  • snake_case: Common in Python and data fields, such as user_name.
  • kebab-case: Useful for URL slugs and CSS class names, such as user-profile.

Does this tool upload my text?

Text conversion should happen in your browser. Avoid pasting confidential information into any online tool unless you have verified how that tool handles data. Always review the result before publishing, especially names, acronyms, code, and headings.

Related free tools

Need to check length after conversion? Try our word and character counter, or return to the free online tools homepage.

Transformed!