What Is a URL Slug?
A URL slug is the part of a web address that appears after the domain name (and any subdirectory) to identify a specific page. In the URL https://www.juicydesigns.co.za/glossary/url-slug/, the slug is url-slug. The term "slug" originates from newspaper editorial jargon, where a slug was a short label used to identify a story, and the meaning transferred naturally to web publishing when content management systems began automatically generating URL paths from article titles.
Slugs are important for both SEO and usability. From an SEO perspective, the slug is one of the on-page elements Google uses to understand what a page is about. A slug that contains the target keyword (such as /seo-services-pretoria/) gives an additional relevance signal compared to a non-descriptive slug like /p-id=4829 or /services-1/. From a usability perspective, a descriptive slug makes links more clickable and trustworthy, particularly when shared on social media or in email campaigns where the full URL is visible.
The standard best practices for SEO-friendly slugs are widely agreed upon. Slugs should be lowercase, since URLs are case-sensitive in many server configurations and mixed case creates potential duplicate URL issues. Words should be separated by hyphens, not underscores, because Google treats hyphens as word separators and historically treated underscores as character joiners (meaning url_slug could be read as a single word). Stop words (and, the, of, in) are generally omitted to keep slugs concise without losing meaning.
Slugs should be as short as possible while still being descriptive. Long slugs with many words add noise without improving clarity. A product page for "Premium Organic Rooibos Tea Bags 40 Pack" has a better slug as /organic-rooibos-tea/ than as /premium-organic-rooibos-tea-bags-40-pack-buy-online/. Including the target keyword once is sufficient. Keyword stuffing in slugs does not improve rankings and can appear untrustworthy to users.
Once a page is published and indexed, changing the slug requires a 301 permanent redirect from the old URL to the new one. Without this redirect, the old URL returns a 404 error, breaking all existing backlinks and bookmarks. For on-page SEO, choosing the right slug at publication is preferable to changing it later.
URL Slug In Practice
The scenario below is an illustrative example, not a Juicy Designs client result. The figures indicate the scale of effect that URL slug clean-up work typically produces, so treat them as indicative rather than measured.
Picture a South African insurance comparison website that uses an e-commerce platform that auto-generates slugs from product titles. For its car insurance quote pages, the platform would create slugs like /car-insurance-quotes-for-south-african-drivers-get-the-best-price-today/. Slugs of this kind run to over 70 characters, include stop words and marketing phrases, and change slightly with each product title update, so a chain of 301 redirects accumulates over time.
An SEO audit of a site like this would typically find that Google is not passing full link equity through the long redirect chains, with several pages sitting three to four redirects away from the final URL. The sensible recommendation would be a slug audit: standardise all product page slugs to a format of /car-insurance/[product-name]/ where the product name segment is 2 to 4 words maximum.
The migration would involve setting up 301 redirects from every old URL and updating all internal links to point directly to the new clean slugs. The XML sitemap would be updated to list only the new canonical URLs. Once Google recrawls the site over several weeks, the redirect chain issue should resolve and link equity would flow cleanly to the target pages. Several category pages could plausibly see ranking improvements for competitive insurance terms within around two months of the migration.
A common mistake during this type of migration is forgetting to update internal links and leaving them pointing at redirecting URLs. While the redirect means users reach the correct page, Google recommends updating internal links to point directly at the final URL to avoid unnecessary redirect hops and preserve full link equity transfer.
What a URL slug is
A URL slug is the part of a web address that identifies a specific page, the readable portion after the domain and any folders, typically describing the page in a few words. In the address example.co.za/blog/website-cost-south-africa, the slug is website-cost-south-africa. A good slug is short, descriptive and readable, using words rather than meaningless codes or numbers, so that both people and search engines can tell what the page is about from the URL alone. Slugs matter for usability and SEO: a clear, keyword-relevant slug helps users understand and trust a link before clicking, is easier to share and remember, and gives search engines a small additional signal about the page's topic. Conventions for good slugs include using lowercase letters, separating words with hyphens (not underscores or spaces), keeping them concise by including the key terms and dropping filler words, and making them descriptive of the page's actual content. While the slug is only one modest ranking factor, a tidy, descriptive slug is part of clean URL structure and good on-page practice, contributing to a page that is clear to users and search engines alike.
URL slug best practices
Writing good URL slugs follows a few reliable conventions. Keep them concise and focused on the key terms: include the main keyword or the essence of the page's topic, and drop filler words (a, the, and) that add length without meaning, so the slug is short and readable. Use lowercase letters throughout and separate words with hyphens, which is the standard and search-engine-friendly word separator, rather than underscores or spaces. Make the slug descriptive of the actual content, so it accurately reflects the page, and avoid meaningless strings of numbers or codes where a readable slug is possible. Aim for stability: because changing a slug changes the URL, which can break existing links and lose accumulated SEO value unless you set up a redirect, it is best to choose a good slug when publishing and avoid changing it later; if you must change one, implement a 301 redirect from the old URL to the new. Avoid stuffing keywords unnaturally, a slug should read cleanly, not cram in repeated terms. And keep slugs consistent with your site's URL structure. These practices produce URLs that are clear to users, shareable, and tidy for search engines, which is the modest but real contribution a well-formed slug makes to a page's usability and SEO.
FAQ
Should I include the year in my URL slug for blog posts?
Generally, avoid including the year in the slug. A slug like /best-seo-tools/ ages better than /best-seo-tools-2024/ because you can update the content each year without changing the URL. Changing a URL requires a 301 redirect and causes a temporary loss of link equity, so it is better to choose an evergreen slug from the start.
Can I change my URL slugs after publishing for better SEO?
Yes, but you must implement a 301 permanent redirect from the old URL to the new URL to preserve link equity and prevent broken links. Without a 301 redirect, changing a slug will create a 404 error for anyone who has bookmarked or linked to the old address, and any backlinks pointing to the original URL will no longer pass equity.
Should you include the year in a URL slug for blog posts?
Generally no, unless the year is genuinely part of the topic (such as an annual report). Including a year dates the URL, so if you update the post later, the slug either looks outdated or must be changed, which risks breaking links. Keeping the year out of the slug lets you refresh the content over time without the URL becoming stale.
Can you change URL slugs after publishing?
You can, but do so cautiously: changing a slug changes the URL, which breaks existing links and can lose accumulated SEO value unless you implement a 301 redirect from the old URL to the new one. Because of this, it is best to choose a good slug at publication and avoid changing it; if a change is necessary, always set up the redirect.