Text Case Converter
Convert text between various cases entirely in your browser. Quick buttons, code-style conversions, custom rules, and find-replace.
How to Use
Quick Buttons
- UPPERCASE
- Converts all characters to uppercase. Example: hello world → HELLO WORLD
- lowercase
- Converts all characters to lowercase. Example: HELLO WORLD → hello world
- Title Case
- Capitalizes the first letter of every word. Example: hello world → Hello World
- Sentence case
- Capitalizes only the first letter of each sentence. Example: hello world. goodbye. → Hello world. Goodbye.
- 1 Space
- Collapses multiple consecutive spaces into a single space. Tabs and newlines are not affected.
- Lines → Space
- Replaces all line breaks with a single space, merging multiple lines into one.
Highlight & Boundary
- Off
- No highlighting. The default mode.
- All
- Colors the first letter of every word — blue for uppercase, orange for lowercase.
- A↑
- Colors only words whose first letter is uppercase (blue).
- a↓
- Colors only words whose first letter is lowercase (orange).
- Boundary: Space
- Words are split only by spaces. Useful for normal prose.
- Boundary: All
- Words are split by spaces and special characters (underscore, hyphen, dot, slash, comma, etc.). Useful for code and technical text.
Case Conversion
Select the current format of your text (Input) and the desired format (Output), then click Apply. Each line is converted independently.
- Space separated
- Normal text with spaces between words. Example: my variable name
- camelCase
- First word lowercase, subsequent words capitalized, no separator. Example: myVariableName
- PascalCase
- Every word capitalized, no separator. Example: MyVariableName
- snake_case
- All lowercase, separated by underscores. Example: my_variable_name
- kebab-case
- All lowercase, separated by hyphens. Example: my-variable-name
- CONSTANT_CASE
- All uppercase, separated by underscores. Example: MY_VARIABLE_NAME
- dot.case
- All lowercase, separated by dots. Example: my.variable.name
Character / Word Rules
Enter a word or character pattern, choose an action, and click Apply All. Rules are applied in order from top to bottom. All occurrences of the pattern are affected.
- UPPERCASE
- Converts the entire matched text to uppercase.
- lowercase
- Converts the entire matched text to lowercase.
- Capitalize first
- Capitalizes only the first character of the matched text.
- Lowercase first
- Lowercases only the first character of the matched text.
- Add space after
- Inserts a space after every occurrence. Applying multiple times adds multiple spaces.
- Add space after (if none)
- Inserts a space after the match only if there isn't one already. Safe to apply repeatedly.
Find & Replace
Add one or more find-and-replace pairs. All pairs are applied in order from top to bottom when you click Apply All. Every occurrence of the 'Find' text is replaced.
Tips
Quick Buttons for Common Conversions
UPPERCASE, lowercase, Title Case, and Sentence case cover the vast majority of daily text formatting needs. One click to transform your entire text.
Case Conversion for Code
Use the Case Conversion section to transform between camelCase, PascalCase, snake_case, kebab-case, and CONSTANT_CASE. Select the input format so the tool knows how to split words.
Find & Replace Multiple Pairs
Add multiple find-and-replace pairs and apply them all at once. Useful for batch renaming variables, fixing typos, or normalizing terminology.
Visual Highlighting Helps Verify
Turn on the highlight feature to color-code the first letter of each word — blue for uppercase, orange for lowercase. A quick visual check after converting.
Common Use Cases
Writing & Editing
Fix capitalization in blog posts, articles, or emails. Convert headings to Title Case or body text to Sentence case in seconds.
Variable Naming
Convert between camelCase, snake_case, PascalCase, and kebab-case when moving code between languages or following naming conventions.
Data Cleanup
Normalize inconsistent capitalization in CSV exports, database dumps, or spreadsheet data before importing into another system.
Social Media & Marketing
Create attention-grabbing UPPERCASE headers or clean lowercase aesthetic text for social media posts and captions.
Batch Text Processing
Apply multiple find-and-replace rules at once to clean up large blocks of text. Combine with case conversion for powerful transformations.
Internationalization
Prepare text for i18n by normalizing case before translation. Ensure consistent formatting across language files.