snake_case Converter
Free online snake_case converter. Instantly turn any text, phrase, or variable name into snake_case — all lowercase with words joined by underscores, like first_name or user_profile_id — then copy it with one click. No uploads, no sign-up, and your text never leaves your device.
ToolsSoup’s snake_case Converter is a free online tool that rewrites any text in snake_case: it lowercases every word and joins them with underscores instead of spaces. So “User Profile Id”, “userProfileId”, and “user-profile-id” all become user_profile_id. Paste a label, a column name, or a camelCase or kebab-case identifier, click the button, and you get a clean snake_case string ready to drop into your Python code, SQL schema, or environment variables. Everything runs in your browser — there are no uploads, no sign-up, and no character limit, and your text never leaves your device.
What is snake_case?
snake_case is a naming style where every word in a phrase is lowercase and the words are joined with underscores instead of spaces, like first_name, total_amount, or get_user_by_id. The underscores keep the words readable while staying valid as a single identifier. It is the standard convention for variables, functions, and module names in Python and Ruby, and it is widely used for database table and column names. snake_case differs from camelCase and PascalCase, which join words with capital letters and no underscores, and from kebab-case, which uses hyphens instead of underscores. A variant called SCREAMING_SNAKE_CASE uses all uppercase and is common for constants and environment variables.
How to convert text to snake_case
Turning a phrase or identifier into snake_case takes just a few seconds:
- Type directly into the text box or paste the text you want to convert.
- Click Convert to snake_case to lowercase the words and join them with underscores.
- Review the snake_case result in the output box on the right.
- Click Copy result to copy the snake_case string to your clipboard.
When should you use snake_case?
Reach for snake_case whenever a style guide or framework expects underscore-separated identifiers: naming Python and Ruby variables and functions, database tables and columns, JSON keys for APIs that follow snake_case, file names, and configuration keys. It is also the natural choice for environment variable names and constants when written in uppercase. Because the converter accepts spaced text, camelCase, PascalCase, and kebab-case as input, it is a quick way to normalize mixed naming into one consistent snake_case style without retyping anything.
Why use this snake_case converter?
- Converts spaces, camelCase, PascalCase, and kebab-case into clean snake_case in one click.
- Lowercases every word and joins them with underscores automatically.
- Splits on capital letters too, so userProfileId becomes user_profile_id correctly.
- Handles each line on its own, so you can convert a whole list of names at once.
- No character limit and an instant one-click copy.
- Runs entirely in your browser — your text is never uploaded or stored.
Frequently asked questions
How do I convert text to snake_case?
Paste your text into the box and click Convert to snake_case. The tool splits the text into words, lowercases each one, and joins them with underscores. The snake_case result appears in the output box ready to copy with one click.
What is snake_case?
snake_case writes a phrase in all lowercase with words joined by underscores, such as first_name or get_user_data. It is the most common naming style for variables and functions in Python and Ruby and for database table and column names.
What is the difference between snake_case and camelCase?
snake_case keeps every word lowercase and separates them with underscores (user_name), while camelCase removes the spaces and capitalizes each word after the first (userName). snake_case is common in Python and databases, and camelCase in JavaScript and Java.
Can it convert camelCase or kebab-case to snake_case?
Yes. The converter treats spaces, hyphens, and the boundaries between lowercase and uppercase letters as word breaks, so userProfileId, user-profile-id, and “User Profile Id” all become user_profile_id.
Can I convert several names at once?
Yes. Each line is converted on its own, so you can paste a list of labels or identifiers and get one snake_case result per line in a single click.
Is my text private?
Absolutely. All conversion happens locally in your browser using JavaScript, so the text you enter is never sent to or stored on any server.