What Makes a Good Slug: SEO-Friendly URLs Explained

A URL slug is one of the few pieces of SEO that's entirely within a site owner's control, permanent once published, and visible to every person who ever shares or hovers over the link — which makes it worth getting right the first time.

What a slug actually is

The slug is the readable part of a URL that identifies a specific page — in example.com/blog/best-free-online-tools-2026, the slug is best-free-online-tools-2026. It's generated from a title but simplified: lowercase, hyphenated, stripped of punctuation and stop words.

Why slugs matter beyond aesthetics

• Readability. A clean slug tells both humans and search engines what a page is about before they even click it.
• Shareability. A slug like /gst-calculator looks trustworthy pasted into a chat; /page?id=48291 does not.
• Stability. Slugs ideally don't change after publishing — changing them breaks existing links and loses any accumulated search ranking for that URL unless a redirect is set up.

Rules that consistently produce good slugs

Rule	Why
Use hyphens, not underscores	Search engines treat hyphens as word separators; underscores are sometimes read as joining words together
Keep it short but descriptive	Long slugs are harder to read and share, though a slug should still meaningfully describe the page
Avoid stop words where possible	Words like "the," "and," "of" add length without adding clarity
Never include dates you might need to update	A slug like "-2024" becomes misleading once the content is refreshed for a new year

A quick before-and-after

"10 Best Ways to Save Money in 2026!!!" as a raw title becomes an unwieldy slug if converted literally. Simplified: save-money-tips — shorter, evergreen, and just as clear about the page's topic.

Frequently asked questions