URL Slugs: How to Make Them SEO-Friendly
Bad slugs hurt SEO. Here's what makes a good URL slug, common mistakes to avoid, and a free tool to generate them.
# URL Slugs: How to Make Them SEO-Friendly
A URL slug is the part of the URL that identifies a specific page. In https://example.com/blog/how-to-bake-bread, the slug is how-to-bake-bread.
What Makes a Good Slug
- Lowercase — URLs are case-sensitive on some servers. Lowercase avoids confusion.
- Hyphen-separated — Google treats hyphens as word separators. Underscores are not treated as separators.
- Short — 3-5 words is ideal. Longer slugs dilute keyword relevance.
- No stop words — Drop "the", "a", "an", "of", "in" unless removing them changes the meaning.
- No special characters — Avoid
?,&,=,+— they have URL-specific meanings.
Good vs Bad Slugs
| Bad Slug | Good Slug | Why |
|---|---|---|
/blog/post/12345 | /blog/how-to-bake-bread | Descriptive, not numeric |
/The-10-Best-Ways-To-Bake-Bread-At-Home | /best-bread-recipes | Shorter, no caps, no stop words |
/how_to_bake_bread | /how-to-bake-bread | Hyphens, not underscores |
/how%20to%20bake%20bread | /how-to-bake-bread | No encoded spaces |
How Slugs Affect SEO
Google has confirmed that URLs are a minor ranking factor. But slugs matter more for CTR — a clean, descriptive URL gets more clicks in search results than a messy one.
Slugs also help users understand where they are on your site. Breadcrumbs and URL structure work together: /blog/seo/url-slugs tells you exactly what the page is about.
Generating Slugs Automatically
If you're building a CMS or blog, generate slugs from titles by:
- Convert to lowercase
- Replace spaces with hyphens
- Remove special characters
- Strip stop words
- Transliterate accented characters
Our URL Slug Generator does all of this. Paste a title, get a clean slug. Free, no signup.
## URL Slugs Across Different Platforms
Different CMS platforms handle slugs differently:
- WordPress: Auto-generates slugs from post titles. You can edit them individually. Uses hyphens, lowercase only.
- Ghost: Similar to WordPress, auto-generates from titles. No slug editing in the free version.
- Hugo/Jekyll: Slugs come from the filename or a frontmatter field. You have full control.
- Next.js: Slugs are derived from the file path in the
app/orpages/directory. - Shopify: Product and collection URLs use slugs. Auto-generated from product names, editable.
- Medium: Auto-generates slugs from titles with a random suffix to prevent collisions.
SEO Impact of Slugs
Google has stated that URL structure is a minor ranking factor, but slugs affect SEO in indirect ways:
- Click-through rate: A clean, descriptive slug in search results gets more clicks than
?p=12345. - Keyword relevance: Having the target keyword in the URL provides a small ranking signal.
- Link readability: When people share URLs in plain text (email, forums), a readable slug encourages clicks.
- Site structure: Hierarchical slugs (
/blog/seo/url-slugs) help users and search engines understand site organization.
Slug Best Practices
- Keep it short: 3-5 words is ideal. Google truncates long URLs in search results.
- Use hyphens: Hyphens are word separators in URLs. Underscores are not (Google treats
word_wordas one word). - Lowercase only: URLs are technically case-sensitive. Lowercase avoids duplicate content issues.
- No stop words: Remove "the", "a", "an", "is", "of" unless they change the meaning.
- No special characters: Avoid
?,&,=,#— they have URL-specific meanings. - Be descriptive:
/blog/how-to-bake-sourdough-breadis better than/blog/article-47.