Case Converter | Uppercase & Lowercase Text
Text Case Converter
Convert text to UPPERCASE, lowercase, Sentence case, Title Case, camelCase and more. Free, instant and private.
What is a text case converter?
A text case converter changes the capital and small letters of your text in one click. Paste your text, choose a format such as uppercase, lowercase, sentence case or title case, then copy the result. No retyping and no software to install.
How can I convert text to upper case online?
Paste your text into the box above and click UPPER CASE. Every letter becomes a capital instantly. Press Copy text to use it, or Undo to go back.
How to convert text into sentence case?
Paste your text and click Sentence case. The tool lowercases everything, then capitalizes the first letter of each sentence and the word I. Proper nouns and acronyms need a quick manual fix.
How do I convert ALL CAPS to mixed case?
Paste the text and click Sentence case for normal sentences, Title Case for headings or lower case for all small letters. Then retype names and acronyms such as NASA.
How to capitalize in Word online?
In Word for the web, select the text and look for Change Case on the Home tab, which may sit under the More font options menu. If you cannot find it, paste the text into this converter, pick a case and paste it back.
Change case in Word, Excel and Google Docs: shortcut keys
Convert uppercase to lowercase in Word, or small letters to capital in Excel, with these built-in options.
| Where | How to change case |
|---|---|
| Word (Windows) | Select text and press Shift+F3 to cycle through case styles, or use Home → Change Case (Aa). |
| Word (Mac) | Select text and try Fn+Shift+F3, or use Format → Change Case. |
| Excel | =UPPER(A1) for capitals, =LOWER(A1) for small letters, =PROPER(A1) for Each Word Capitalized. Paste results as values. |
| Google Sheets | Same formulas: =UPPER(), =LOWER(), =PROPER(). |
| Google Docs | Select text, then Format → Text → Capitalization → lowercase, UPPERCASE or Title Case. |
| VS Code | Ctrl+Shift+P, then "Transform to Uppercase", "Lowercase" or "Title Case". |
| CSS | text-transform: uppercase | lowercase | capitalize changes how text looks, not the stored text. |
Menu names can change between app versions. If a shortcut does not work, paste your text into the converter above.
Text case examples
Same sentence, different cases. Input: the quick brown fox jumps over the lazy dog
| Case | Result | Best for |
|---|---|---|
| Sentence case | The quick brown fox jumps over the lazy dog | Body text, emails, UI labels |
| lower case | the quick brown fox jumps over the lazy dog | Tags, cleaning data |
| UPPER CASE | THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG | Short labels, warnings |
| Capitalized Case | The Quick Brown Fox Jumps Over The Lazy Dog | Names, product labels |
| Title Case (AP / APA) | The Quick Brown Fox Jumps Over the Lazy Dog | Blog titles, headlines |
| Title Case (Chicago / MLA) | The Quick Brown Fox Jumps over the Lazy Dog | Books, essays |
| camelCase | theQuickBrownFoxJumpsOverTheLazyDog | JavaScript, Java variables |
| snake_case | the_quick_brown_fox_jumps_over_the_lazy_dog | Python, SQL columns |
| kebab-case | the-quick-brown-fox-jumps-over-the-lazy-dog | URLs, CSS classes |
Uppercase vs lowercase letters, and title case rules
Uppercase letters (A, B, C) are capital letters. Lowercase letters (a, b, c) are small letters. Title case mixes them by style-guide rules, and each guide treats short words differently.
| Style | Stays lowercase | Always capitalized |
|---|---|---|
| AP | Articles, conjunctions and prepositions of three letters or fewer | First and last word, words of four letters or more |
| APA | Short articles, conjunctions and prepositions (three letters or fewer) | First word, word after a colon, major words, words of four letters or more |
| Chicago | Articles, coordinating conjunctions and all prepositions | First and last word, word after a colon |
| MLA | Articles, prepositions, coordinating conjunctions, "to" in infinitives | First and last word, principal words |
Check your publisher's current style guide for print or exam work.
Which case should you use?
Blogs and SEO
Use Title Case or sentence case for headings, and lowercase hyphenated slugs for URLs. Pick one style and use it everywhere.
Developers
camelCase for JavaScript variables, PascalCase for classes, snake_case for Python and databases, kebab-case for CSS and files.
Students
Format paper titles and headings to APA, MLA or Chicago, then check names and acronyms by hand.
Marketers
Keep product names, ad copy and social posts consistent. Avoid long ALL CAPS text, which reads like shouting.
Data teams
Lowercase emails and categories before matching or deduplicating, and use Remove extra spaces to tidy imports.
Designers
Test buttons and navigation in sentence case and title case before shipping a design.
| Language | Variables & functions | Classes | Constants |
|---|---|---|---|
| JavaScript / TypeScript | camelCase | PascalCase | CONSTANT_CASE |
| Python | snake_case | PascalCase | CONSTANT_CASE |
| Java / Kotlin | camelCase | PascalCase | CONSTANT_CASE |
| Ruby / Rust | snake_case | PascalCase | CONSTANT_CASE |
| CSS / HTML | kebab-case | kebab-case | --kebab-case |
Follow your team's style guide first. Conventions vary by project.
Everything you need to fix text capitalization
A complete text case toolkit for writers, students, marketers and developers, built to be fast and private.
18 text case modes in one converter
From UPPER CASE and Sentence case to camelCase, snake_case and URL slugs, with no switching between tools.
4 title case styles
AP, APA, Chicago and MLA rules for headlines and papers.
Undo and redo
Try any case, then step back freely.
Live text statistics
Characters, words, sentences and reading time.
Instant results
No waiting, no signup, no limits.
Private by design
Conversion runs in your browser. Your text is never uploaded or stored.
Copy or download
Send the result to your clipboard or save it as a .txt file.
See the converter in action
Real before-and-after examples show what each mode does to your text.
ALL CAPS to Sentence case
Headline to Title Case (AP)
Words to camelCase
Title to URL slug
How the text case converter works
Four quick steps from messy text to the format you need.
Paste your text
Type it or paste it from Word, Docs, a website or a spreadsheet.
Pick a case
Click uppercase, lowercase, sentence case, title case or a code format.
Check the result
The text updates in place. Press Undo if you want the original back.
Copy or download
Copy to your clipboard or download the text as a .txt file.
Capitalization best practices by platform
Each place you publish has its own habits. These are common, widely used approaches. Always follow your brand or publisher style guide if you have one.
YouTube video titles
Title Case and sentence case both work well. Choose one and keep it consistent across your channel.
How to Change Text Case in SecondsEmail subject lines
Sentence case feels personal. Avoid ALL CAPS, which can look like spam and may hurt deliverability.
Your invoice is readySEO page titles and headings
Title Case is common for page titles. Put your main keyword near the start and keep the style the same on every page.
Text Case Converter: Uppercase, Lowercase and MoreLinkedIn and bios
Title Case suits job titles and headlines, while sentence case reads naturally in summaries and about sections.
Senior Content Marketing ManagerButtons and menus
Sentence case is easy to scan. It looks calmer than all caps and is simple to translate.
Save changesFile names and URLs
Use lowercase words joined by hyphens. Avoid spaces and capital letters to prevent broken or duplicate links.
case-converter-tool.html6 capitalization mistakes to avoid
Small errors make writing look careless. Spot them quickly and fix them with one click.
Long text in ALL CAPS
All caps slows reading because words lose their shape, and it can feel like shouting.
Mixed heading styles
Pick Title Case or sentence case and use it for every heading level.
Lowercase "I"
Sentence case mode fixes the standalone word I for you.
Broken acronyms
Case converters lowercase the rest of each word, so retype acronyms and brand names afterwards.
Capitals in URLs
Use lowercase and hyphens. Some servers treat capital letters as different pages.
Over-capitalizing small words
Title case styles keep short words like to, a and of lowercase.
Your text never leaves your browser
Many online tools send your text to a server. This converter does not, which makes it safe for emails, drafts and private documents.
Nothing is uploaded
All conversion happens on your device using your browser.
Nothing is stored
We do not save, log or read what you type.
Safe for private content
Use it for emails, contracts, notes and drafts without worry.
Text case glossary
A plain-English guide to the names used for each text case.
Uppercase
All letters are capitals, also called capital letters or caps.
Lowercase
All letters are small. Also called small letters.
Sentence case
Only the first word of each sentence and proper nouns are capitalized.
Title case
Major words are capitalized and short words like a, of and to stay lowercase.
camelCase
Words are joined with no spaces, starting lowercase with a capital for each new word.
PascalCase
Like camelCase but the first word is also capitalized. Common for class names.
snake_case
Lowercase words joined with underscores. Popular in Python and databases.
kebab-case
Lowercase words joined with hyphens. Ideal for URLs and CSS classes.
Text case converter FAQ
Quick answers to the most common questions.
How do I convert small letters to capital letters in Excel?
Use =UPPER(A1) to make all letters capital, =LOWER(A1) for small letters and =PROPER(A1) to capitalize the first letter of each word. Copy the results and paste them as values.
What is the shortcut key to change case in Word?
In Word on Windows, select text and press Shift+F3 to cycle through case styles. On Mac, try Fn+Shift+F3. Excel and Google Docs have no default case shortcut, so use formulas or the Format menu.
Do I need a text case converter extension?
No. This converter runs in any browser tab with nothing to install and no extension permissions. Bookmark the page for quick access.
Is my text uploaded or stored?
No. The conversion runs entirely in your browser. Your text is not sent to a server and is not saved, so it is safe for private content.
Which title case style should I use?
Use AP or APA for news, blogs and web content, where words of four letters or more are capitalized. Use Chicago or MLA for books and academic writing, where all prepositions stay lowercase.
Does the converter keep acronyms like NASA?
Sentence, capitalized and title case lowercase the rest of each word first, so acronyms need a quick fix. Press Undo to get the original back.
Can I turn a title into a URL slug?
Yes. Click URL slug. It removes accents and symbols, lowercases the words and joins them with hyphens.
Is there a character or word limit?
The tool sets no limit. Because it runs on your device, very large documents may feel slower.
Ready to convert your text?
Paste it in, pick a case and copy the result in seconds.