When to Use Hyphens, Underscores or Lowercase in URLs

URL formatting should be boring. Hyphens, underscores and capitalization look minor, but inconsistent choices make links harder to read, compare and maintain.

Use the Slug Generator, Slug Cleaner and Lowercase Converter before publishing or sharing a URL pattern.

Use hyphens for public slugs

Hyphens are easier to read in page slugs and are the safest default for SEO-friendly URLs.

Use underscores only when a system expects them

Underscores can be useful in campaign names, filenames or internal IDs, but they are less readable in public slugs.

Lowercase avoids duplicates

Lowercase URLs and campaign values reduce accidental variants. This matters for redirects, analytics and manual sharing.