Snake_case Converter
Convert text to snake_case (e.g., hello_world) for Python and database naming.
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What is snake_case?
The snake_case Converter transforms text into snake_case format - a naming convention where words are separated by underscores and all letters are lowercase. It's the standard convention in Python, Ruby, and database schema design.
Premium Features
Live Conversion
See results instantly as you type variable names.
File Upload
Load .txt files with multiple variable names to convert.
Batch Mode
Convert multiple variable names line-by-line.
Common Use Cases
Python Development
Convert variable and function names to snake_case following PEP 8 Python style guidelines. Standard for Python codebases.
Database Schema
Format database table and column names in snake_case. Standard for PostgreSQL, MySQL, and most SQL databases.
Config & Environment
Convert configuration keys and environment variable names to readable snake_case format for .env files and settings.
File Names
Create readable, standardized file names for Python modules, scripts, and project files following best practices.
Need Other Programming Cases?
Check out our camelCase, kebab-case, PascalCase, and CONSTANT_CASE converters.
Explore All Case Options →snake_case Naming Rules
Format:
- ✓ All lowercase: No uppercase letters
- ✓ Underscores: Words separated by underscores (_)
- ✓ No other separators: No spaces, hyphens, or special characters
- ✓ Example: "user first name" → "user_first_name"
Example
Frequently Asked Questions
What is snake_case?
snake_case is a naming convention where words are separated by underscores and all letters are lowercase. For example, 'user name' becomes 'user_name'. It's commonly used in Python, Ruby, and database column names.
When should I use snake_case?
Use snake_case for: Python variables and functions, Ruby methods and variables, database table and column names, file names in Python projects, configuration keys, and environment variables.
What's the difference between snake_case and camelCase?
snake_case uses underscores between words and all lowercase (user_first_name), while camelCase removes spaces and capitalizes subsequent words (userFirstName). snake_case is preferred in Python and databases, while camelCase is common in JavaScript.
Can I convert multiple variable names at once?
Yes! Enable Batch Mode to convert multiple variable names line-by-line. Enter each variable name on a new line, and the tool will convert each one to snake_case independently.
Does snake_case work for database column names?
Yes! snake_case is the standard naming convention for database columns in PostgreSQL, MySQL, and most SQL databases. It's readable, avoids reserved keywords, and works consistently across systems.
How does the tool handle numbers and special characters?
The tool extracts alphanumeric words, converts them to lowercase, and joins them with underscores. Special characters are removed. Numbers are preserved within words.
Is my code saved or stored?
No. All conversion happens 100% client-side in your browser. Your code and variable names never leave your device, ensuring complete privacy and security.
Is this snake_case converter free?
Yes, completely free with no registration, hidden fees, or limitations. Use it for personal or commercial development projects.