Last updated: March 2026
How URL Slugs Affect SEO Rankings
Google uses URL slugs as a lightweight signal to understand page content. A page at /running-shoes-review signals relevance to search engines better than /page?id=47832. But the bigger impact is on click-through rates — users scanning search results are more likely to click a URL they can understand.
Studies show that URLs with keywords get 45% more clicks than URLs without them. The slug is visible in search results, browser address bars, and social media shares. A clean, descriptive slug builds trust and sets expectations about the page content before the user even clicks.
Slug Formatting Rules by Platform
WordPress auto-generates slugs from post titles and allows editing in the permalink settings. It lowercases, removes special characters, and uses hyphens. Always review auto-generated slugs — WordPress doesn't remove stop words by default. Shopify generates from product names and collection names, using hyphens and lowercase.
Next.js and static site generators use folder and file names as URL paths — your slug IS the filename. This makes it especially important to name files carefully. GitHub Pages uses the Markdown filename minus the extension. Each platform has slightly different rules, but the principles are the same: lowercase, hyphens, no special characters.
Frequently Asked Questions
How do URL slugs affect SEO rankings?
URL slugs are a minor but confirmed ranking factor. Google uses the slug to understand page content. More importantly, clean slugs improve click-through rates in search results — users are more likely to click a URL like '/best-running-shoes' than '/p?id=83721'. Higher CTR indirectly improves rankings.
What makes a good SEO slug?
A good SEO slug is: short (3-5 words), contains the primary keyword, uses hyphens (not underscores), is lowercase, avoids stop words where possible, and clearly describes the page content. Match the slug to the user's search intent — if they'd search 'best running shoes 2026', the slug should be 'best-running-shoes-2026'.
Should I include dates in URL slugs?
Generally no. Dates make content look outdated over time, and you'll want to update the content without changing the URL. Exception: if the date IS the content (e.g., event pages, annual reports), include it. For evergreen content, skip dates and just update the content regularly.
How do different platforms handle slugs?
WordPress auto-generates slugs from titles (editable). Shopify generates from product names. Next.js uses folder/file names as slugs. Ghost CMS auto-generates from titles. Most CMSs let you customize slugs — always review and shorten auto-generated ones before publishing.
Can I use non-English characters in slugs?
Technically yes (IRIs support Unicode), but it's not recommended. Non-ASCII characters get percent-encoded in URLs (%C3%A9 for é), making URLs unreadable and hard to share. Best practice: transliterate accented characters to ASCII (café → cafe) and use English keywords for maximum compatibility.
What happens if two pages have the same slug?
Most CMSs (WordPress, Shopify, Ghost) automatically append a number: 'my-page', 'my-page-2', 'my-page-3'. However, identical slugs under different paths are fine: '/blog/getting-started' and '/docs/getting-started' are unique URLs. Always ensure each full URL path is unique.