Convert text to uppercase, lowercase, title case, sentence case, and more in seconds. Whether you need to change case, convert upper case to lower case, switch lowercase to uppercase, or fix accidental CAPS LOCK text, ConvertText.app provides a fast, free online case converter that lets you change case online directly in your browser. Paste your text, click once, and transform capital letters exactly the way you need.
Updated February 2026 — regularly improved for better accuracy and user experience.
Our online case converter lets you instantly convert case and change text case in multiple formats. Convert to upper case, convert to lower case, switch uppercase to lowercase, or transform capital letters into properly formatted sentences in just one click.
Whether you are correcting ALL CAPS text, preparing headlines, formatting assignments, or cleaning up pasted content, this free case converter gives you precise control over how your text appears.
The sentence case converter automatically formats your text so that the first letter of each sentence is capitalized while the remaining letters are converted to lowercase. This is ideal when you need to change text from ALL CAPS to readable, properly structured sentences.
How it works: The tool detects sentence boundaries — periods, exclamation marks, and question marks — then capitalizes the first letter after each one while converting the rest to lowercase.
Example: "This is an example of sentence case formatting."
Perfect for: Academic papers, business emails, blog posts, and any content that needs standard grammar formatting.
Use the lowercase converter to instantly convert text to lower case. This tool is perfect when you need to change uppercase to lowercase, fix CAPS LOCK text, or standardize inconsistent formatting.
Example: "this is completely lowercase text"
Common uses: CSS class names, database fields, email addresses, usernames, and any text that needs to be uniformly lowercase.
Developer tip: Lowercase text is essential for case-sensitive programming languages and maintaining consistent naming conventions.
The uppercase converter transforms your text into capital letters with one click. Convert to upper case for headlines, emphasis, or when you need all caps formatting.
Example: "THIS IS UPPERCASE TEXT FOR MAXIMUM IMPACT"
Ideal for: Headlines, warning labels, call-to-action buttons, social media emphasis, and anywhere you need text to stand out.
Design tip: Use uppercase sparingly for short, high-impact text. Long blocks of ALL CAPS reduce readability.
Create properly formatted titles by converting text to title case instantly. The title case converter capitalizes major words while keeping shorter connector words appropriately formatted.
Rules applied: Nouns, verbs, adjectives, and adverbs are capitalized. Words like "a", "an", "the", "and", "or", "but", "in", "on", "at" stay lowercase unless they are the first or last word.
Example: "This Is an Example of Proper Title Case"
Perfect for: Book titles, article headlines, blog post titles, academic papers, and professional presentations.
Convert text to camelCase for programming and structured naming conventions. The first word remains lowercase while each following word begins with a capital letter.
Example: "thisIsCamelCaseText"
Standard in: JavaScript, Java, C#, and many other languages for naming variables, functions, and object properties.
The PascalCase converter capitalizes the first letter of every word, including the first word, and removes spaces. This format is commonly used for class names and structured identifiers.
Example: "ThisIsPascalCaseText"
Used in: React components, C# classes, .NET types, and API endpoint naming.
Transform text into snake_case where words are separated by underscores and letters remain lowercase. This format is widely used in databases and programming.
Example: "this_is_snake_case_text"
Common in: Python variables, database column names, API parameters, and configuration keys.
Create kebab-case text by separating words with hyphens and converting everything to lowercase. This format is ideal for URLs, slugs, and SEO-friendly web addresses.
Example: "this-is-kebab-case-text"
SEO benefit: Search engines prefer hyphen-separated URLs, making kebab-case the best choice for page slugs and file names.
Generate alternating case text where letters switch between uppercase and lowercase for stylistic or creative purposes.
Example: "tHiS iS aLtErNaTiNg CaSe TeXt"
Used for: Sarcasm memes, creative social media posts, gaming usernames, and playful text effects.
Reverse the order of characters in your text instantly. This tool flips your text from right to left, creating mirrored or backward text.
Example: "txet desrever si sihT"
Useful for: Creative formatting, puzzles, codes, or experimenting with text transformations.
In addition to changing case, you can remove extra spaces, eliminate empty lines, and clean up inconsistent formatting.
Combine case conversion with formatting cleanup to prepare polished, ready-to-use text in seconds.
Track character count, word count, sentence count, and line count in real time as you convert case.
Whether you are formatting assignments, preparing posts, or adjusting content length, instant statistics help you stay within limits.
Convert variable names, change case conventions, and prepare structured identifiers instantly. Switch between lowercase, uppercase, camelCase, PascalCase, snake_case, and kebab-case without manual editing.
Save time by automatically converting capital letters and formatting large code snippets in seconds.
Quickly convert ALL CAPS to sentence case, format titles properly, and ensure consistent capitalization across documents.
Whether editing drafts or preparing headlines, this online case converter helps maintain professional formatting effortlessly.
Convert upper case to lower case, format research titles, and standardize assignments quickly.
Correct formatting mistakes and adjust capital letters without rewriting your entire document.
Format email subject lines, convert capital letters, and standardize text across presentations and marketing materials.
Instantly change case online to maintain consistency and professional appearance.
All case conversion happens directly in your browser. Your text is never uploaded, stored, or shared.
Convert uppercase to lowercase or change case safely without exposing sensitive information.
Yes! ConvertText.app is completely free to use. You can convert unlimited text without any restrictions, sign-ups, or hidden fees. All conversion tools are available instantly in your browser.
No, we prioritize your privacy. All text conversion happens locally in your browser. Your text is never sent to our servers, stored, or saved. Once you close the browser tab, your text is completely gone.
ConvertText.app can be used for personal, educational, and commercial projects without any restrictions. Whether you're a freelancer, business owner, or enterprise user, you're free to use our tools.
We support all major text case formats including UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, alternating case, inverse case, and more.
Once the page loads, all conversion functionality works without an internet connection since everything runs in your browser. However, you need internet access to initially load the website.
There's no strict character limit, but very large texts (100,000+ characters) may slow down your browser. For optimal performance, we recommend processing extremely large documents in smaller chunks.
Yes! Use the "Copy" button to copy text to your clipboard, or the "Download" button to save the converted text as a .txt file to your device.
Yes! ConvertText.app is fully responsive and works perfectly on smartphones, tablets, and desktop computers. The interface adapts to your screen size for the best experience.
ConvertText.app combines speed, accuracy, and simplicity. Instantly convert to upper case, convert to lower case, fix CAPS LOCK text, or change text case without registration or limits.
Designed for everyday users and professionals alike, it delivers reliable case conversion with a single click.
Free online tools to convert, encode, and transform your text
