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Case Converter
Convert text between uppercase, lowercase, title case, and more — instantly
Convert Text Case Instantly with the Free Case Converter
Need to quickly change the case of your text? Our free Case Converter lets you transform text between uppercase, lowercase, title case, sentence case, and more — all in real time with no signup required. Whether you're fixing improperly capitalized titles, converting a paragraph to sentence case for formal writing, generating alternating case for social media posts, or just need a quick lowercase version of copied text, this tool handles it instantly. Type or paste your text, pick a mode, and the converted result appears on the right side immediately. Each transformation is pure JavaScript running in your browser — nothing is sent to a server. You can copy the result, clear the input, or try one of the example texts to see how each mode works. Character and word counts are shown for both input and output so you can compare at a glance. Modes include UPPERCASE (all caps), lowercase, Title Case (capitalize each word), Sentence case (capitalize first word only), tOGGLE cASE (reverse each letter's case), and aLtErNaTiNg cAsE (alternating caps — also known as spongebob meme text).
Key Features
- Six case modes: uppercase, lowercase, title case, sentence case, toggle, alternating
- Real-time conversion as you type — no buttons to press
- Side-by-side input/output layout on desktop, stacked on mobile
- Character and word counts for both input and output
- Copy result to clipboard with one click
- Works offline — all processing happens in your browser
- Clear button and quick-example texts to get started
Common Use Cases
- Writers fixing title capitalization for articles and blog posts
- Students formatting essays and academic papers
- Social media users creating alternating-case posts
- Developers normalizing text data or user input
- Anyone who needs to quickly transform text case without installing software
Try an example:
Frequently Asked Questions
Title case capitalizes the first letter of every word (e.g., 'The Quick Brown Fox'). Sentence case capitalizes only the first letter of the first word and any proper nouns (e.g., 'The quick brown fox'). Use title case for headlines and sentence case for body text.
Toggle case reverses the case of every letter. If a letter is uppercase, it becomes lowercase, and vice versa. For example, 'Hello World' becomes 'hELLO wORLD'.
Alternating case (also called spongebob meme text or mock case) alternates between lowercase and uppercase letters: 'aLtErNaTiNg cAsE'. It's commonly used on social media to convey a mocking or sarcastic tone.