SEO-Friendly URL Slugs

What a slug is and why it matters

The slug is the human-readable end of a URL, the part after your domain that names the page. It is a minor ranking signal, so a keyword in the slug helps a little, but its bigger job is trust. A clean, descriptive slug tells both search engines and people exactly what the page is about, and searchers are more likely to click a URL they can read than a string of numbers.

The rules of a good slug

Keep it lowercase, since mixed-case URLs can cause duplicate-content headaches. Separate words with hyphens, not underscores or spaces, because search engines read hyphens as word breaks. Include your main keyword. Keep it short, three to five meaningful words is plenty. And drop the filler: articles and conjunctions like "a," "the," and "of" add length without adding meaning.

What to avoid

Avoid dates and numbers that will age the URL, like /2023-guide, since you cannot easily change a slug later without setting up redirects. Avoid stop-word soup that makes the slug long and vague. Avoid special characters and spaces, which get encoded into ugly percent codes. And avoid stuffing the keyword multiple times, which looks spammy and helps nothing.

Match the slug to the keyword, not the title

Your title can be longer and more compelling than your slug. The slug should be the tight, keyword-focused core. If your title is "How to Write an SEO Title That Ranks in 2026," your slug does not need all of that, "how-to-write-an-seo-title" captures the keyword cleanly. Trim to the essential terms and let the title do the selling.

Set it once and leave it

Because changing a live slug means setting up a redirect to preserve any ranking the old URL earned, it is worth getting right the first time. Decide your target keyword, write a clean slug around it before you publish, and avoid the temptation to tweak it later. A small amount of care up front saves redirect work down the line.

This formats a slug. The Pro tool checks it in context.

Formatting a slug is the easy part, and the box above handles it. The SEO Keyword Density Analyzer checks the part that matters for ranking: whether your focus keyword actually appears in the slug, alongside your title, meta, headings, and the full on-page checklist. This box formats length only; the tool checks the SEO.