Snake Case Converter — Text to snake_case Online
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.
Input
getUserProfile Output
get_user_profile camelCase input is split on its capital boundaries, so you do not need to add spaces first. Acronym runs stay whole: parseHTTPResponse becomes parse_http_response.
Common Use Cases
Naming database columns
Convert display names or camelCase API fields into the snake_case identifiers that SQL tables, migrations and ORM models expect, without renaming each column by hand.
Writing Python to PEP 8
Turn a phrase or a JavaScript-style name into the snake_case that PEP 8 requires for Python functions, variables and module names, so linters stay quiet.
Defining environment variables
Convert config names into the underscore-separated form used in .env files and CI settings, then uppercase the result for the final SCREAMING_SNAKE_CASE form.
Mapping an API payload to a database
Translate a camelCase JSON response into the snake_case column names your insert statement needs, which is the usual chore when wiring a third-party API into storage.
Frequently Asked Questions
- Where is snake_case the standard?
- Python variables and functions under PEP 8, SQL table and column names, Ruby methods, and Rails database fields. Environment variables use the SCREAMING_SNAKE_CASE variant of the same convention. Many JavaScript APIs carry snake_case JSON on the wire but use camelCase objects in code, which is why converting between the two is such a common chore.
- Does the converter handle camelCase input?
- Yes. It detects the capital-letter boundaries in camelCase or PascalCase input and inserts underscores there, so getUserProfile becomes get_user_profile without you adding spaces first. Acronym runs stay together rather than exploding letter by letter, so parseHTTPResponse becomes parse_http_response and not parse_h_t_t_p_response.
- Why do databases prefer snake_case over camelCase?
- Because unquoted SQL identifiers are case-folded. PostgreSQL lowercases them, so a column created as userProfile is stored as userprofile, and every later reference needs double quotes to keep the capitals. Underscores survive folding untouched, so a snake_case name reads identically everywhere. For the JavaScript form use the Camel Case Converter; for URL slugs use the Kebab Case Converter.
- What is SCREAMING_SNAKE_CASE and when should I use it?
- It is the same convention uppercased, and it signals a constant rather than a variable. Use it for environment variables in .env files and CI settings, and for module-level constants in Python and JavaScript. Convert here first and then uppercase the result — the word splitting is identical, only the final casing differs.
- How are accented characters handled?
- Accented characters are folded to their closest ASCII form rather than dropped, so "Café Menu Items" becomes cafe_menu_items and the German ß expands to ss. That matters for database columns and file names, where a stray non-ASCII byte can break a migration, a shell script, or a client library that assumes plain ASCII identifiers.
- 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.