snake_case Converter Online
Convert any text to snake_case naming convention instantly in your browser. This free tool processes everything client-side, keeping your data private.
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, and more. Results update as you type.
About Case Conversion
- Automatically detects word boundaries from camelCase, separators (hyphens, underscores, dots, slashes), and whitespace.
- Supports 11 case styles commonly used in programming, CSS, file paths, and documentation.
- Everything runs in your browser — no data is sent over the network.
What is snake_case?
snake_case is a naming convention where multi-word identifiers are written in all lowercase with words separated by underscores. For example, "user first name" becomes "user_first_name". It is one of the most readable naming conventions because the underscores act as clear visual separators between words.
Where is snake_case used?
snake_case is the standard naming convention in Python (PEP 8), Ruby, Rust, and PostgreSQL. It is also common for database column names, environment variables (often in SCREAMING_SNAKE_CASE), and REST API field names in Python-based frameworks like Django and FastAPI. C and C++ also traditionally use snake_case.
Frequently Asked Questions
How do I convert camelCase to snake_case?
Paste your camelCase text into the converter and it will automatically insert underscores before each uppercase letter and lowercase the entire string. For example, "userFirstName" becomes "user_first_name".
What is SCREAMING_SNAKE_CASE?
SCREAMING_SNAKE_CASE (also called CONSTANT_CASE) uses all uppercase letters with underscores, like MAX_RETRY_COUNT. It is the standard convention for constants in Python, Java, JavaScript, and most other languages.