Tool guide

snake_case to kebab-case Converter Online

Paste names written in snake_case — my_variable_name, user_id, created_at — and get the same list back in kebab-case with hyphens instead of underscores. This comes up daily when database or Python field names move into front-end code: CSS classes, data attributes, file names and URL slugs all use hyphens. You can paste a whole column of names at once. The substitution runs inside the tab, with no upload. See also: go from camelCase back to snake_case, camelCase straight into hyphens, a clean page address from a string.

How to use it

Paste your names into the «snake_case text» box — one per line or as running text, like the my_variable_name placeholder.
Press «Convert»; every underscore becomes a hyphen and all other characters are left alone.
Read the «kebab-case result» box and check that double underscores turned into double hyphens where that is acceptable.
Press «Copy» and paste the list into your stylesheet, router or configuration file.
Upper-case letters are not touched here — run the lowercase tool first if your source mixes cases.

FAQ

When should I use kebab-case instead of snake_case?

Underscores are the convention in Python, Ruby and SQL column names. Hyphens are the convention in CSS classes, HTML attributes, npm package names and URLs — search engines treat a hyphen as a word separator and an underscore as a word character.

What happens to a double underscore like __init__?

Each underscore is replaced independently, so __init__ becomes --init--. That is meaningless for Python dunder methods, so exclude them from the list before converting or fix the output by hand.

Can I convert a few hundred names at once?

Yes. Paste the whole column into the input box; line breaks are preserved and the output comes back line for line. It works well with names copied straight out of a DESCRIBE result or a migration file.

Does it lower-case the letters too?

No. It only swaps the underscore character for a hyphen, so User_Name becomes User-Name rather than user-name. Run the lowercase converter first if you need an all-lowercase CSS class or URL slug.

Is the output safe to use in a URL?

For ASCII names, yes. Non-Latin characters are kept as they are, and while browsers accept them they get percent-encoded in links and look unwieldy. Transliterate first if you are building slugs from non-Latin text.

Is there a kebab-to-snake direction?

Not on this page — it converts one way only. The reverse is the same single substitution and is quickest done with find-and-replace in your editor. Related camelCase converters live in the same text tools section.

Does my code get uploaded anywhere?

No. The substitution runs in a script on the page, and the field contents never leave the tab. That makes it safer for internal table and column names than services that process input on a backend.

Examples

Database columns into CSS classes

Before: user_id order_total created_at

After: user-id order-total created-at

File name into a URL slug

Before: how_to_pick_a_laptop_2026

After: how-to-pick-a-laptop-2026

snake_case to kebab-case Converter Online

How to use it

FAQ

Examples

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