A slug is the readable part of a page URL that identifies a specific page, post, or product. In a URL like /seo-basics/on-page-seo-checklist, the slug is on-page-seo-checklist. It should be short, descriptive, and easy for both users and search engines to understand.
Why a slug matters for SEO
A clear slug helps search engines quickly understand what a page is about. It also improves usability because people can read the URL in search results, browser bars, and shared links. Good slugs can support better click-through rates when they match search intent and make the topic obvious.
For SEO beginners and in-house teams, slugs matter because they are one of the easiest on-page elements to control. A messy slug with random numbers, dates, or unclear words can make a page look low quality or outdated. A clean slug supports a stronger site structure and makes content easier to manage over time.
How to write a good slug
Keep it short and specific
Use only the words needed to describe the page. Remove filler words unless they improve clarity. For example, /keyword-research-guide is better than /a-complete-guide-to-doing-keyword-research-for-beginners.
Include the main topic
Add the primary keyword or topic naturally. This helps reinforce page relevance without stuffing. If the page is about technical SEO audits, a slug like /technical-seo-audit is clearer than /site-check.
Use lowercase words and hyphens
Most websites use lowercase letters and hyphens between words because they are easier to read and less likely to cause formatting issues. Avoid spaces, underscores, and special characters where possible.
Avoid changing slugs without a plan
If a page is already live, changing the slug can break links and hurt rankings unless you set up a proper 301 redirect. Only update a slug when there is a strong reason, such as removing a date, fixing a vague structure, or aligning with a better content strategy.
Practical example of a slug
Imagine you publish an article targeting the keyword “local SEO checklist.” A weak slug might be /blog/post-127. A stronger slug would be /local-seo-checklist. The second version is clearer, easier to share, and more useful for searchers deciding whether to click.
As a simple rule, write the slug right after choosing the page’s primary topic. Keep it readable, aligned with search intent, and stable once published.