Developer Case Tool
snake_case Converter
Convert text to snake_case for Python, Ruby, and databases.
Features
CamelCase to snake_case
Detects camelCase and PascalCase word boundaries and inserts underscores correctly.
All Lowercase Output
snake_case is always lowercase — the converter lowercases every character.
Multi-Line Support
Process multiple identifiers at once by placing one per line.
How to Use
- 1
Paste your text or identifiers
Enter any text, camelCase, PascalCase, kebab-case, or phrase.
- 2
View snake_case output
The converter splits words and joins them with underscores in lowercase.
- 3
Copy for use
Use the output in Python code, SQL schemas, or config files.
Examples
Phrase
Input
get user profile dataOutput
get_user_profile_dataFrom camelCase
Input
getUserProfileDataOutput
get_user_profile_dataFrom kebab-case
Input
api-response-handlerOutput
api_response_handlerCommon Questions
snake_case is an identifier style that uses all lowercase letters with underscores separating words. It resembles a snake lying flat: 'get_user_data', 'my_variable', 'http_request_handler'.
It automatically detects word boundaries in camelCase and PascalCase names and separates them with underscores. 'getUserData' and 'GetUserData' both produce 'get_user_data'.