Case Converter
Convert text to uppercase, lowercase, title case, or sentence case instantly.
Conversion Type
Text Formatting
Programming / Code
0 characters · 1 lines
0 characters · 1 lines
Why Use a Case Converter?
Text case affects readability, professionalism, and brand consistency across all written communications. Our free case converter instantly transforms text between uppercase, lowercase, title case, sentence case, and capitalized case—eliminating manual retyping and ensuring consistent formatting. Whether you're fixing ALL CAPS emails, formatting article headlines for SEO, or standardizing product names in databases, proper case conversion saves hours of manual editing while preventing formatting errors that damage credibility. After converting case, you may also want to create URL slugs for SEO or count words to meet content requirements.
Different contexts demand different capitalization styles: title case for headlines and book titles (capitalizing major words), sentence case for blog posts and academic writing (only first word capitalized), uppercase for emphasis or acronyms, lowercase for casual social media or email addresses, and capitalize each word for proper nouns or brand names. Using the wrong case can make content appear unprofessional, reduce search engine rankings, or violate style guide requirements for publications, academic journals, or corporate brand standards.
Common Use Cases
📰 Headlines & Article Titles
SEO best practices and style guides (AP, APA, Chicago) require title case for article headlines, capitalizing major words while keeping articles, conjunctions, and short prepositions lowercase. Manual capitalization of 10-15 word headlines is error-prone and time-consuming. Converting to title case ensures professional formatting that meets editorial standards and improves click-through rates from search results.
After converting titles, use Character Counter to verify length stays under 60 characters for SEO, then Word Counter to check reading time estimates.
📧 Email Subject Lines & Marketing Copy
ALL CAPS SUBJECT LINES trigger spam filters and appear aggressive, reducing email open rates by up to 30%. Converting to sentence case or title case makes emails look professional while bypassing spam detection. Marketing teams use case conversion to test subject line variations for A/B testing, comparing "Free Shipping Today" (title case) against "Free shipping today" (sentence case) to optimize engagement.
Optimize subject lines with Trim Lines to remove extra spaces, then Remove Line Breaks to create single-line text perfect for email clients.
💻 Code Conventions & Programming
Different programming languages have strict naming conventions: JavaScript uses camelCase, Python prefers snake_case, constants use UPPER_CASE, and class names use PascalCase. Converting variable names, function names, or database column names to match project coding standards ensures consistency and prevents linting errors. Case conversion also helps when migrating between languages or frameworks with different conventions.
For batch variable renaming, combine with Find & Replace to update code patterns, then Sort Lines to organize import statements or configuration files alphabetically.
📝 Content Migration & Data Cleanup
When migrating content from legacy systems, inconsistent capitalization creates messy databases with "Product Name", "PRODUCT NAME", and "product name" treated as different entries. Converting all entries to a standard case (typically title case for names, sentence case for descriptions) before import ensures data consistency and prevents duplicate detection failures during deduplication processes.
After standardizing case, use Remove Duplicates to clean your dataset, then CSV Safe to prepare clean data for spreadsheet imports.
How Case Conversion Works
Our case converter supports five transformation modes, each with specific rules: Lowercase converts all characters to lowercase (a-z), ideal for email addresses, URLs, or casual content. Uppercase converts everything to capitals (A-Z), perfect for acronyms, constants, or emphasis. Capitalize Each Word capitalizes the first letter of every word regardless of length, useful for proper nouns or brand names like "New York City" or "International Business Machines".
Title Case follows standard title capitalization rules: capitalize first and last words, plus all major words (nouns, pronouns, verbs, adjectives, adverbs) while keeping articles (a, an, the), coordinating conjunctions (and, but, or), and short prepositions (in, on, at, to, for) lowercase unless they're the first or last word. Example: "The Quick Brown Fox Jumps Over the Lazy Dog" becomes proper title case. This matches AP Stylebook, Chicago Manual of Style, and most editorial guidelines.
Sentence Case capitalizes only the first letter of the first word in each sentence (detected by periods, exclamation marks, question marks), plus proper nouns. Example: "THE QUICK BROWN FOX. JUMPS OVER THE LAZY DOG." becomes "The quick brown fox. Jumps over the lazy dog." This style works best for blog content, social media captions, and academic writing. All conversions happen instantly in your browser using JavaScript—no server upload required, ensuring privacy for sensitive business documents or confidential content.
Tips for Best Results
- 1.For blog headlines and article titles, use title case to match SEO best practices and editorial standards. After conversion, manually check that prepositions longer than 4 letters (like "between", "through") are capitalized, as some style guides vary. Use Character Counter to verify titles stay under 60 characters.
- 2.When converting email addresses or URLs to lowercase, double-check the output—some email systems are case-sensitive for the local part (before @). After converting, use Trim Lines to remove any accidental spaces that break email validation.
- 3.For database cleanup and migration, convert all text to sentence case or title case first, then use Remove Duplicates to detect and eliminate entries that differ only by capitalization ("Apple" vs "apple").
- 4.After converting ALL CAPS text to sentence case, review output for acronyms (NASA, HTML, API) that should remain uppercase. Use Find & Replace with case-sensitive matching to restore acronym capitalization across large documents.