Convert text to snake_case
Paste or type your text and convert it to snake_case with one click. It runs entirely in your browser, so nothing is uploaded — just copy the result when you're done.
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How to convert text to snake_case
- Paste or type your text into the box above — it stays in your browser and is never sent anywhere.
- Press the snake_case button to transform the text instantly.
- Copy the result, or keep transforming with the other case buttons.
About snake_case
Converting text to snake_case reformats your words without changing their meaning — handy for headings, code, data and tidying up pasted text.
Everything runs locally in your browser, with no upload, no limit and no sign-up, and you can chain conversions on the same text.
snake_case lowercases every word and joins them with underscores (my_variable), keeping word boundaries readable without spaces or capital letters. It's the convention for identifiers in Python and Ruby and for SQL/database column names, so reach for it when your variables, functions, or table columns need to match those style guides. Because it relies only on lowercase letters and underscores, it stays safe across case-insensitive databases and filesystems that might otherwise mangle camelCase.
Frequently asked questions
How do I convert text to snake_case?
Paste your text into the box and press the snake_case button. The text is converted instantly and you can copy it — all in your browser.
Is my text uploaded anywhere?
No. The conversion happens entirely in your browser, so your text never leaves your device and nothing is stored online.
Can I switch to another case?
Yes. The other options (UPPERCASE, lowercase, Title Case, Sentence case and more) are right there, so you can transform the same text again.
Is there a limit on how much text I can convert?
No. You can convert as much text as you like — it runs locally and instantly, with no sign-up.
What's the difference between snake_case and SCREAMING_SNAKE_CASE?
Both join words with underscores, but snake_case stays all-lowercase for variables, functions, and column names, while SCREAMING_SNAKE_CASE (all uppercase) is the Python and Ruby convention for constants — this converter produces lowercase snake_case, so apply UPPERCASE afterwards if you need the constant form.