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Text Case Converter – Convert Text Capitalization Instantly
Switch between UPPERCASE, lowercase, Title Case, Sentence case, and eight developer-friendly formats like camelCase, snake_case, and CONSTANT_CASE — all processed locally in your browser.
Text Case Converter
Characters (no spaces): 0
Paragraphs: 0
Unique Words: 0
Average Word Length: 0
Longest Word: None
Top Words: N/A
Case Types Explained
Learn what each format does, see a worked example, and know where it is commonly used — or test your own phrase live below.
Live Case Playground
Type once — all twelve conversions update instantly.
UPPERCASE
Converts every letter to capital letters.
hello world → HELLO WORLD
Used for: headings, warnings, labels.
lowercase
Converts every letter to small letters.
HELLO WORLD → hello world
Used for: usernames, normalized data.
Title Case
Capitalizes the first letter of each word.
hello world → Hello World
Used for: titles, headlines.
Sentence case
Capitalizes the first letter of each sentence.
hello world. hello again. → Hello world. Hello again.
Used for: paragraphs, emails.
aLtErNaTiNg
Alternates letter case across the string.
hello → hElLo
Used for: memes, playful posts.
InVeRsE
Swaps every letter's case.
Hello World → hELLO wORLD
Used for: fixing stuck caps-lock.
camelCase
Joins words; first word lower, rest capitalized.
hello world → helloWorld
Used for: JavaScript variables, functions.
PascalCase
Joins words; every word capitalized.
hello world → HelloWorld
Used for: classes, components.
snake_case
Lowercase words joined by underscores.
Hello World → hello_world
Used for: Python vars, DB columns.
kebab-case
Lowercase words joined by hyphens.
Hello World → hello-world
Used for: URLs, slugs, CSS classes.
CONSTANT_CASE
Uppercase words joined by underscores.
hello world → HELLO_WORLD
Used for: constants, env variables.
dot.case
Lowercase words joined by dots.
hello world → hello.world
Used for: config keys, namespaces.
Common Uses
Match the job to the right case format.
| Use case | Best format | Why it helps |
|---|---|---|
| Headlines & titles | Title Case / Sentence case | Match publication style in one click |
| Code identifiers | camelCase / snake_case / CONSTANT_CASE | Match language naming conventions |
| Data cleanup | lowercase / CONSTANT_CASE | Normalize imports and database fields |
| Social & creative | aLtErNaTiNg / InVeRsE | Create playful or emphasis styles |
Capabilities & Limitations
What this converter handles natively, and what it leaves to other tools.
What it does
- Convert between 12 case styles, including Unicode letters in supported Latin-based text.
- Keep your original input untouched until you choose "Use Output as Input".
- Split code formats on spaces and existing camelCase boundaries.
- Provide live word, character, sentence and reading-time estimates.
- Copy, download as .txt, or share to WhatsApp — all in-browser.
What it does not
- Fix grammar or spelling — use the Grammar Checker.
- Apply style-guide title casing (AP/Chicago small-word rules).
- Change case in scripts without capitalization (e.g., Chinese, Japanese).
- Read .docx or .pdf files — paste the raw text instead.
- Store your text on any server.
Troubleshooting
Quick explanations for common surprises.
Title Case didn't capitalize a word
Title Case capitalizes after spaces, hyphens, underscores, quotes, and opening brackets. Words glued to other punctuation (like macDonald) stay exactly as typed.
camelCase / snake_case merged words unexpectedly
Code formats split on spaces and on camelCase boundaries (helloWorld → hello world), and strip punctuation — e.g. Hello, world! becomes helloWorld in camelCase. Punctuation-heavy sentences will lose their marks in code formats.
Output box is empty
The output fills only after you click a case button. Statistics update live as you type, but conversion is an explicit action so your original text is never overwritten.
Undo didn't restore my last keystroke
History saves about half a second after you pause typing, so rapid consecutive edits batch into one step. Undo restores the last saved step.
Frequently Asked Questions
Everything you need to know about case conversion here.
What is a Text Case Converter Tool?
A Text Case Converter changes the capitalization of your text. It switches between UPPERCASE, lowercase, Title Case, Sentence case, and developer formats like camelCase, snake_case, and CONSTANT_CASE, plus live text statistics.
How do I use the Text Case Converter Tool?
Type or paste your text in the input box, then click a case button such as UPPERCASE or camelCase. The converted text appears in the output box while your original input stays untouched. Use "Use as Input" to chain conversions.
Is my text data secure when using this tool?
Yes. All conversion and statistics run inside your browser. Your text is never transmitted to, stored on, or analyzed by our servers.
Can I use the case-converted text anywhere?
Yes. Standard case conversions produce regular characters that work everywhere: documents, emails, social media, and code editors.
How accurate are the text statistics?
The statistics are estimates based on simple text rules. Word counts use whitespace-separated tokens, and reading time is estimated at 200 words per minute.
Is there a limit to how much text I can process?
The tool handles large documents, but for smooth performance we recommend processing text under 50,000 characters at a time, since all processing runs on your device.
Can I use this tool on my mobile device?
Yes. The interface is fully responsive and works on smartphones, tablets, and desktops without any installation.