Case Converter
NumbersConvert text between letter cases: UPPER, lower, Title, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and more. Free online tool for developers.
Input Text
19 chars · 3 words
UPPER CASE
HELLO WORLD EXAMPLE
lower case
hello world example
Title Case
Hello World Example
Sentence case
Hello world example
camelCase
helloWorldExample
PascalCase
HelloWorldExample
snake_case
hello_world_example
kebab-case
hello-world-example
CONSTANT_CASE
HELLO_WORLD_EXAMPLE
dot.case
hello.world.example
What is a Case?
A Case Converter transforms text between different letter case formats used in programming, writing, and URL design. Each case format encodes word boundaries differently — through capitalisation, underscores, hyphens, or dots — and different contexts demand different conventions.
This tool converts any input text into ten standard formats simultaneously:
| Case | Example |
|---|---|
| UPPER CASE | HELLO WORLD EXAMPLE |
| lower case | hello world example |
| Title Case | Hello World Example |
| Sentence case | Hello world example |
| camelCase | helloWorldExample |
| PascalCase | HelloWorldExample |
| snake_case | hello_world_example |
| kebab-case | hello-world-example |
| CONSTANT_CASE | HELLO_WORLD_EXAMPLE |
| dot.case | hello.world.example |
For Indian developers and writers, switching between these formats is a daily task — JavaScript variables use camelCase, Python functions use snake_case, database columns use snake_case, class names use PascalCase, URL slugs use kebab-case, and environment variables use CONSTANT_CASE. Moving code between layers (frontend → API → database) means constant renaming that this converter automates in a single step.
Use alongside the Number Base Converter and Word Count Calculator for complete text and number tooling.
How to use this Case calculator
- The converter loads with "Hello World Example" as the default input to demonstrate all 10 output formats.
- Click inside the Input Text area and type or paste your text. All 10 case variants update instantly.
- The character count and word count below the textarea update as you type — useful for verifying that the word splitter detected the correct number of words in your input.
- Click Copy on the card for your target case format to copy it to clipboard.
- Use the Clear button (bottom-right of the input area) to reset the input and start fresh.
- The URL updates as you type — share the URL with a pre-filled input by copying it from your browser's address bar.
- For mixed inputs like
getUserProfileDataorget-user-profile-data, check the snake_case output: if it showsget_user_profile_data, the word splitting worked correctly.
Formula & Methodology
The converter splits input into words before applying case rules. Word boundaries are detected by: 1. camelCase/PascalCase boundaries — a lowercase letter followed by an uppercase letter (e.g.helloWorld→hello,World) 2. Consecutive capitals followed by a lowercase letter —ABCDef→ABC,Def3. Separator characters — hyphens, underscores, and dots are treated as word separators and removed 4. Whitespace — spaces and tabs split words as expected After splitting, each target case is applied:UPPER CASE: words → joined with spaces → .toUpperCase() lower case: words → joined with spaces → .toLowerCase() Title Case: words → each word capitalised → joined with spaces Sentence case: full text → .toLowerCase() → first char capitalised camelCase: words → first word lowercase, rest capitalised → joined PascalCase: words → each word capitalised → joined snake_case: words → all lowercase → joined with '_' kebab-case: words → all lowercase → joined with '-' CONSTANT_CASE: words → all uppercase → joined with '_' dot.case: words → all lowercase → joined with '.'Example — "getUserProfileData": | Step | Result | |---|---| | Detect boundaries |get,User,Profile,Data| | Normalise |get,user,profile,data| | camelCase |getUserProfileData| | snake_case |get_user_profile_data| | kebab-case |get-user-profile-data| | CONSTANT_CASE |GET_USER_PROFILE_DATA| Edge case: abbreviations like "ITR", "API", "GST" are treated as sequences of single letters by the camelCase detector. "fileITROnline" splits asfile,I,T,R,Online— which may not be the intended result. For abbreviation-heavy text, consider adding spaces manually before converting.
Frequently Asked Questions
What is a Case Converter?
A Case Converter transforms text between different letter case formats — such as UPPER CASE, lower case, camelCase, snake_case, PascalCase, and kebab-case. Each case format serves a specific purpose in programming, content writing, database design, and URL structuring. This tool converts any input text into all ten standard cases simultaneously, with one-click copy for each result.
What is camelCase and when should I use it?
camelCase writes the first word in lowercase and capitalises the first letter of each subsequent word, with no spaces or separators — for example, 'helloWorldExample'. It is the dominant convention for variable and function names in JavaScript, TypeScript, Java, Swift, and Kotlin. In Indian software development contexts, camelCase is standard in most Node.js and React projects, which make up a large share of the Indian startup technology stack.
What is snake_case and why is it used in Python and databases?
snake_case uses all lowercase letters with underscores separating words — for example, 'hello_world_example'. Python's PEP 8 style guide mandates snake_case for variable names, function names, and module names. PostgreSQL and MySQL database column names conventionally use snake_case since SQL is case-insensitive and underscores avoid quoting requirements. In Indian data engineering projects built on Python and PostgreSQL, snake_case is the most common naming convention.
What is PascalCase and where is it used?
PascalCase capitalises the first letter of every word with no separators — for example, 'HelloWorldExample'. It is the standard for class names in Java, C#, TypeScript, Python, and most object-oriented languages. Component names in React and Angular also use PascalCase (e.g., UserProfileCard). In Indian enterprise Java and .NET development, PascalCase is universally used for class and interface names.
What is kebab-case and where is it used?
kebab-case uses all lowercase letters with hyphens separating words — for example, 'hello-world-example'. It is the standard for URL slugs, CSS class names, HTML attributes, and npm package names. SEO-friendly URLs use kebab-case because hyphens are treated as word separators by search engines while underscores are not. On thecalcu.com, all calculator and converter URLs use kebab-case slugs, such as /sip-calculator/ and /speed-converter/.
What is CONSTANT_CASE and when should I use it?
CONSTANT_CASE uses all uppercase letters with underscores separating words — for example, 'HELLO_WORLD_EXAMPLE'. It is the universal convention for named constants and environment variables in most programming languages: Java, Python, C, JavaScript (for module-level constants). Environment variables in .env files always use CONSTANT_CASE (e.g., DATABASE_URL, API_SECRET_KEY, NODE_ENV). Indian DevOps and cloud engineering teams use CONSTANT_CASE for all infrastructure configuration values.
What is the difference between Title Case and Sentence case?
Title Case capitalises the first letter of every word — 'Hello World Example' — and is used for article headings, page titles, and book chapter names. Sentence case only capitalises the first letter of the first word — 'Hello world example' — and is used for body text, button labels, and UI copy. Indian content teams and English-language publications increasingly prefer Sentence case for body content and subheadings, following the style of major international publications.
What naming conventions are used in Indian IT and software projects?
Indian IT projects span multiple technology stacks with different conventions. Java enterprise projects (common in Indian banks, insurance, and large enterprises) use camelCase for methods, PascalCase for classes, and CONSTANT_CASE for constants. Python projects follow PEP 8: snake_case for variables and functions, PascalCase for classes. React/Node.js projects use camelCase for variables, PascalCase for components, and kebab-case for CSS. Database teams almost universally use snake_case for column names. Many Indian product startups adopt Google's Java Style Guide or Airbnb's JavaScript Style Guide.
How do I convert snake_case to camelCase?
Paste your snake_case text into the input field and click Copy next to the camelCase output. For example, 'user_profile_card' becomes 'userProfileCard'. The converter handles any combination of separators in the input — snake_case, kebab-case, dot.case, and even mixed camelCase inputs are all split into words correctly before converting to your target case.
What is dot.case and when is it used?
dot.case uses all lowercase letters with dots separating words — for example, 'hello.world.example'. It is used in configuration file keys (such as Java .properties files and some YAML structures), logging namespace identifiers (log4j, SLF4J loggers are typically named 'com.company.module'), and some programming language module paths. dot.case is less common than camelCase and snake_case but appears regularly in enterprise Java and configuration management contexts.
How does the Case Converter handle mixed input?
The Case Converter splits input text into words before applying the target case, so mixed input formats are handled correctly. 'helloWorldExample', 'hello-world-example', 'hello_world_example', 'Hello World Example', and 'HELLO_WORLD_EXAMPLE' all produce the same word list ['hello', 'world', 'example'] and therefore the same output in each target case. CamelCase boundaries (a lowercase letter followed by an uppercase letter) are detected and treated as word separators.
How do I use the Case Converter?
Type or paste your text into the Input Text area at the top. All ten case variants — UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and dot.case — update instantly below. Click the Copy button on any card to copy that result to your clipboard. The input supports multi-word phrases, existing camelCase, snake_case, or any mixed format. The URL updates as you type, so you can share a pre-filled link.