snake_case Converter

Lowercase words joined with underscores, like order_total or date_of_birth. Paste a list and convert it all at once.

Your text

Result

How to convert to snake_case

Paste your words or names into the top box, one per line.
Each line is converted to snake_case in the result box.
Copy the list and paste it into your code, SQL script or spreadsheet.

Examples

Input	snake_case
First Name	`first_name`
userAccountId	`user_account_id`
Total Price (incl. tax)	`total_price_incl_tax`
shipping-method	`shipping_method`

Where snake_case is used

Python: PEP 8, the official style guide, uses snake_case for variables, functions and module names.
Ruby and Rust: methods, variables and file names.
Databases: table and column names in PostgreSQL and MySQL are very often snake_case, because unquoted names are not case sensitive.
PHP and WordPress: WordPress functions and hooks follow it, like get_the_title.
File names: underscores avoid problems that spaces can cause in scripts and command lines.

Turning spreadsheet headers into column names

Here is a common job: you have a spreadsheet with headers like "Customer Name", "Order Date" and "Amount Paid" and you need to import it into a database. Copy the header row, paste it into a text editor so each header is on its own line, then paste that here. You will get customer_name, order_date and amount_paid ready to use.

Frequently asked questions

What is snake_case?

snake_case writes every word in lower case and puts an underscore between them, like user_id or created_at. The underscores make it look like a snake lying flat on the ground.

Can I convert camelCase to snake_case?

Yes. The tool spots where a capital letter starts a new word, so userAccountId becomes user_account_id.

What happens to punctuation?

Punctuation and symbols are treated as word breaks and removed, so "price (USD)" becomes price_usd.

Is there an uppercase version?

Yes. Uppercase words with underscores are usually called CONSTANT_CASE or SCREAMING_SNAKE_CASE. Use our CONSTANT_CASE converter for that.