Snake_case converter

The snake_case converter joins words with underscores — lowercase for Python and Ruby, UPPER option for SQL and constants.

How to convert text to snake_case

Paste your text
Any mix of cases, separators and line breaks is fine.
Watch it convert
The output updates live with every keystroke.
Tune the options if offered
Some case modes offer a lowercase/uppercase word choice.
Copy the result
One click, done.

Python variables, Ruby symbols, SQL columns and config keys.

Deterministic word splitting means multi-word inputs, hyphens, underscores and camelCase all converge to the same clean result.

It runs locally: paste confidential drafts, unreleased product names or client copy without a second thought.

Input accepted	Mixed case, separators, multiple lines
Word splitting	camelCase humps, -, _, spaces and punctuation are all boundaries
Word case	lowercase by default; toggle the option for SCREAMING output
Processing	100% in your browser

Every tool runs locally on your device. Nothing you paste is uploaded, stored, or tracked.

Does it handle accents and non-Latin scripts?

Accented Latin letters convert fine. Non-cased scripts (Chinese, Arabic…) pass through unchanged since they have no case.

Can I convert a whole document?

Yes — paste as much as you like. Line structure is preserved where the case mode allows it.

Is there an API?

No API by design: the tool is a page that runs locally, so your text never touches a server.