When you publish a page, every part of its URL sends a small signal — to search engines and to the human about to click it. The slug, the part after your domain, is one of the most overlooked pieces of on-page SEO, and one of the easiest to get right from day one. The fastest way to see why is to look at the same page title turned into three different slugs.
Before and after: the same article, three ways
Bad: /blog/?p=4821 — tells a reader nothing about what's on the page before they click.
Better: /blog/the-truth-about-bmi-and-why-it-might-be-outdated-in-2025 — readable, but bloated with stop words and a date that will age badly.
Best: /blog/truth-about-bmi — short, keyword-first, no filler, ages well. This is the version that shows up cleanly in search results and reads naturally when someone pastes the link into a chat.
Why the "best" version actually performs better
Search engines read URLs to understand what a page covers — a slug containing your target keyword gives an early, unambiguous signal before a single word of body text is parsed. URLs also show up directly in search results, so a clean slug is simply more clickable: /blog/truth-about-bmi tells a searcher exactly what they're about to read, where /blog/?p=4821 tells them nothing. And when that link gets pasted into a forum, a group chat, or a tweet, the slug itself carries meaning even with no surrounding text.
Six rules, with a before/after for each
- Lowercase, always.
/Blog/URL-Slugs→/blog/url-slugs. URLs are case-sensitive on many servers, and mixed case invites duplicate-URL issues. - Hyphens, not underscores.
/url_slugs_guide→/url-slugs-guide. Google treats hyphens as word breaks; underscores get read as one fused word. - Keyword near the front.
/blog/everything-you-need-to-know-about-url-slugs→/blog/url-slugs-seo-guide. - Cut stop words.
/blog/the-truth-about-bmi→/blog/truth-about-bmi. Words like "a," "the," "and," "of" add length with no SEO value. - No dates baked in.
/blog/2025/07/url-slugs→/blog/url-slugs. A dated slug looks stale the moment the year changes, unless the content is genuinely time-bound. - Never silently change a live slug. If a URL is already indexed and linked to, changing it without a 301 redirect destroys that page's accumulated SEO value instantly.
The shortcut
Our URL Slug Generator takes any title and applies all six rules automatically — lowercase, hyphens, stop-word removal, accent handling — so you get the "best" version without doing it by hand every time.