What Makes a Good URL Slug?

You publish a page and your CMS hands you a URL like /blog/post?id=4821&cat=12&ref=home. It works. It also tells a visitor, a search engine, and future-you absolutely nothing about what's on the page. Six months later you're trying to remember which numbered ID was the pricing guide.

The slug — the readable part of the URL after your domain — is one of the few SEO elements a person can actually judge on sight. A good one is a short, honest label. A bad one is either a wall of noise or a string of digits, and both cost you clicks, clarity, and rankings you didn't need to give up.

What is a URL slug?

The slug is the segment of a URL that identifies one specific page in plain words — the part after the domain and any folder structure. In rebrixe.com/blogs/what-makes-a-good-url-slug, the slug is what-makes-a-good-url-slug.

• It's the human-readable address. Where a database ID means nothing to a person, a slug like black-leather-boots tells them exactly what's on the page before they click.
• It's separate from the page title. A title can be a full sentence with punctuation; a slug is a compressed, URL-safe version of that same idea.
• It's part of what search engines read. Along with the title tag and headings, the slug is one more signal search engines use to understand what a page is about.
• Most CMS platforms generate one automatically. WordPress, Shopify, and similar tools auto-fill a slug from your title, but that default is rarely the cleanest version — it usually still needs editing.

The practical takeaway: a slug isn't decoration. It's a small, permanent label that either helps or gets in the way every time the URL is seen, shared, or crawled.

Why slug quality matters

A slug is easy to overlook because it doesn't change how a page looks to a visitor once they're on it. But it shows up in places that do affect behavior:

• It's visible in search results. Google often displays the URL path beneath the title, so a clean slug reinforces relevance right where people are deciding whether to click.
• It's what gets shared and pasted. A slug that reads like a phrase looks trustworthy in a chat message or email; a slug full of numbers and symbols looks like spam.
• It affects long-term maintainability. Descriptive slugs make it possible to scan a sitemap or list of URLs and understand the site's structure at a glance, months or years later.
• It plays a small but real role in rankings. Keyword-relevant slugs are one of many minor ranking signals — not decisive on their own, but not worth giving away for free either.

Step-by-step: writing a good slug

1. Start from the page's core topic, not its title. Strip the title down to the two or three words that actually carry the meaning before you touch formatting.
2. Include the primary keyword once. If the page targets "best running shoes," the slug should contain that phrase — not a rephrased or padded version of it.
3. Remove stop words. Drop "a," "the," "of," "and," and similar connector words unless leaving one out makes the phrase confusing to read.
4. Convert to lowercase and separate words with hyphens. Use best-running-shoes, never Best_Running_Shoes or bestrunningshoes.
5. Keep it to three to five words. If it's still long after trimming, ask whether every remaining word is doing real work, or just repeating what the folder path already says.
6. Check it reads as a phrase, not a fragment. A person should be able to say the slug out loud and understand the page's topic without seeing anything else.
7. Lock it in before heavy promotion. Slugs can be changed later with a proper redirect, but treating the first published version as final avoids unnecessary link and ranking churn.

Common slug mistakes

1. Leaving the auto-generated default in place

Most CMS platforms turn your full title into a slug automatically, stop words and all. Publishing that default without a second look is how slugs end up eight words long.

2. Stuffing in every keyword variation

Repeating a keyword or cramming in synonyms — best-running-shoes-top-running-shoes-2026 — doesn't help rankings and reads as spam to anyone who sees the raw URL.

3. Using underscores or mixed case

Underscores can cause Google to read joined words as a single term instead of separate ones, and mixed-case URLs risk being treated as duplicate pages if both versions get crawled and indexed.

4. Changing a live slug without a redirect

Editing a published slug without setting up a 301 redirect breaks every backlink, bookmark, and search ranking pointing to the old address — the content didn't disappear, but as far as visitors and Google are concerned, the page did.

Good slug vs. bad slug examples

Side by side, the difference between a slug that helps and one that hurts is usually obvious:

Every "good" example reads like a short phrase a person would actually say out loud. Every "bad" example either hides the topic behind technical noise or drowns it in extra words.

Slug formatting choices compared

A quick reference for the formatting decisions that come up most often when writing slugs.

Generate a clean URL slug right now — free

The Rebrixe Slug Generator turns any page title into a short, hyphenated, lowercase slug with stop words stripped automatically. No account, no watermark — just paste your title and copy the result.

Frequently asked questions