snake_case Converter

About this tool

Convert any phrase to snake_case: lowercase words joined by underscores, e.g. "User First Name" → "user_first_name". Standard for Python variables and SQL column names.

Example

Input: User First Name

Output: user_first_name

How to use

Paste or type your text into the box above, then read or copy the result. Everything runs privately in your browser, your text is never uploaded to a server.

How to use this tool

1. Paste or type your phrase into the input box.
2. Check that the words are separated the way you expect, such as by spaces or punctuation.
3. Read the converted snake_case result shown by the tool.
4. Copy the result and use it in Python variables, SQL columns, or other code.

Step by step, what happens

1. The tool takes your text and breaks it into words based on spaces and common separators.
2. It converts all letters to lowercase so the result follows snake_case style.
3. It joins the words with underscores to make one continuous identifier.
4. You can then reuse the output anywhere you need a lowercase underscore-separated name.

Worked example

If you need a database column name from a label like a form field, this tool turns it into a clean snake_case identifier.

Input: User First Name

1. The tool reads the three words in the input.
2. It changes each word to lowercase.
3. It joins them with underscores instead of spaces.

Tips and common mistakes

• Use it for Python variable names, SQL columns, and other identifiers that should be lowercase with underscores.
• If your input has punctuation, the tool may treat it as a separator, so review the result before copying it.
• If you already have mixed case text like CustomerEmail, paste it and check whether the output matches the naming style you want.
• For best results, start with a short phrase that clearly matches the name you want to create.

Frequently asked questions