String Case Converter

What is the String Case Converter?

This tool converts text between the naming conventions used in programming and writing: camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and plain upper and lower case.

Naming conventions are not arbitrary, each ecosystem has settled on particular ones, and following them is part of writing code that reads naturally to other people working in that language.

JavaScript and Java use camelCase for variables and PascalCase for classes and components. Python and Ruby use snake_case for variables and functions. CSS and URLs use kebab-case. Environment variables and constants use CONSTANT_CASE. Databases conventionally use snake_case for tables and columns.

Converting between them by hand is tedious and error-prone, particularly across a list of names, which is exactly the situation that arises when mapping API fields to database columns or generating code from a schema.

How to use the String Case Converter

1. Paste your text. Enter a single identifier or a list with one per line.
2. Pick a target case. Choose the convention you want to convert to.
3. Copy the result. Converted output is ready to paste into your code.
4. Convert lists in bulk. Multiple lines are converted together, which is the efficient path when remapping a set of field names.

Worked examples

user profile image url

camelCase:      userProfileImageUrl
PascalCase:     UserProfileImageUrl
snake_case:     user_profile_image_url
kebab-case:     user-profile-image-url
CONSTANT_CASE:  USER_PROFILE_IMAGE_URL
Title Case:     User Profile Image Url

firstName
lastName
emailAddress
createdAt

first_name
last_name
email_address
created_at

Common use cases

• Porting code between languages. Moving logic from Python to JavaScript means renaming identifiers to match the target convention.
• Writing database migrations. Converting a list of API field names to snake_case columns in one step.
• Generating CSS class names. Turning component names into kebab-case selectors.
• Creating environment variable names. Converting configuration keys to CONSTANT_CASE for a .env file.

Features and limitations

• Supports camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, uppercase, and lowercase.
• Detects word boundaries from existing casing, underscores, hyphens, and spaces.
• Converts multi-line input in bulk.
• Acronyms are a known ambiguity: whether URL becomes Url or URL in PascalCase depends on the convention you follow, so review output containing acronyms.
• Leading digits and special characters are preserved rather than stripped, since removing them could produce invalid identifiers silently.

Frequently asked questions