A URL slug is the human-readable part of a web address that identifies a specific page — in autonomiqtech.com/what-is-a-url-slug, the slug is what-is-a-url-slug. It seems trivial, but slugs affect click-through rates, SEO, and whether a link still works in two years. Getting them right is quick; fixing them later is painful.
Why the slug earns its keep
Three reasons. First, readability: a person deciding whether to click /best-budget-laptops-2026 versus /p?id=48213 can tell what they will get. Second, SEO: keywords in the slug are a small but real relevance signal, and descriptive slugs earn more clicks in search results. Third, sharing: a clean slug in a chat or social post is self-explaining and looks trustworthy, while a random string looks like spam.
The best-practice checklist
Keep slugs short and descriptive — three to five meaningful words beats a full sentence. Use hyphens, not underscores, because search engines treat hyphens as word separators. Stick to lowercase to avoid duplicate-URL confusion on case-sensitive servers. Drop stop words (a, the, of) when they add nothing. Include your primary keyword near the front. And leave out volatile details like the year or a category that might change, unless they are genuinely part of the page’s identity.
Things to avoid
Avoid spaces (they become ugly %20 codes), special characters, and ID-only slugs like /node/1123. Do not stuff keywords — /cheap-laptop-best-laptop-buy-laptop reads as spam to both people and Google. And avoid dates in the slug for evergreen content, because /2023-guide looks stale the moment the calendar turns.
The rule that saves you later
Here is the one that experience teaches: once a URL is published and indexed, changing its slug breaks every existing link and can cost ranking. If you truly must rename it, always add a 301 redirect from the old slug to the new one so visitors and search engines follow along. The cheapest fix is to write a good, timeless slug on day one so you never have to touch it.
Frequently asked questions
Should I use hyphens or underscores in a URL slug?
Use hyphens. Google treats hyphens as word separators but underscores as joiners, so hyphens are better for readability and SEO.
Does the URL slug affect SEO?
Yes, modestly. A short, keyword-relevant slug is a small ranking signal and improves click-through by making the link readable and trustworthy.
Can I change a slug after publishing?
You can, but it breaks existing links and can lose ranking. If you must, add a 301 redirect from the old slug to the new one.
Should I put the year in a slug?
Avoid it for evergreen content, since it looks outdated quickly. Only include a year if the page is genuinely tied to that year.