Snake Case Converter
Convert text to snake_case — the standard for Python variables, database columns, and file names. Free, instant, client-side snake case converter.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
0 / 100M Limit
Common Use Cases
Naming database columns
Convert display names or camelCase fields into the snake_case identifiers SQL tables and migrations expect.
Writing Python to PEP 8
Turn phrases or JavaScript-style names into the snake_case that Python functions and variables require.
Defining environment variables
Convert config names into the underscore-separated form used in .env files (then uppercase for the final SCREAMING_SNAKE form).
Frequently Asked Questions
- Where is snake_case the standard?
- Python variables and functions (PEP 8), SQL table and column names, Ruby methods, and Rails database fields. Environment variables use the SCREAMING_SNAKE_CASE variant. JavaScript APIs often convert between snake_case JSON and camelCase objects.
- Does the converter handle camelCase input?
- Yes — it detects the capital-letter word boundaries in camelCase or PascalCase input and inserts underscores there, so "getUserProfile" becomes get_user_profile without you having to add spaces first.
- How does snake_case compare to camelCase and kebab-case?
- Same words, different separators and capitalization: snake_case (user_profile) joins with underscores, all lowercase; camelCase (userProfile) has no separator and capitalizes internal words; kebab-case (user-profile) joins with hyphens, all lowercase. Use the Camel Case Converter or Kebab Case Converter to convert straight to those instead.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.