What Is a URL Slug and Why It Matters for SEO
When you look at a URL like text-fast.com/slug-generator, the part after the last slash — slug-generator — is the URL slug. Slugs are the human-readable identifiers that tell both users and search engines what a page is about before it is opened.
What is a URL slug?
A URL slug is the part of a web address that identifies a specific page. It comes after the domain name and any directory path. For the URL https://example.com/blog/how-to-count-words, the slug is "how-to-count-words."
Slugs are called slugs because they were originally used in newspaper printing to label articles with short, descriptive identifiers before the final headline was set. The term carried over into web publishing.
What makes a good URL slug?
A well-formed URL slug has several properties. It should be lowercase only — /Word-Counter and /word-counter are different URLs on case-sensitive servers, so always use lowercase. It should use hyphens, not underscores — Google treats hyphens as word separators, while underscores are treated as word joiners, which affects how your keywords are indexed.
A good slug should contain no special characters — spaces, ampersands, quotes, and percent signs break URLs or require encoding. It should be descriptive and concise, including your primary keyword in 5–6 words or fewer. Stop words like "the," "a," and "of" rarely add value and can be omitted to keep the slug clean.
How URL slugs affect SEO
URL slugs are a confirmed ranking signal in Google's algorithm — minor in isolation, but meaningful as part of a broader on-page SEO strategy. A slug that contains your target keyword tells Google what the page covers before any content is read.
Beyond ranking, slugs affect click-through rate. Users who see a URL in search results trust clean, readable slugs more than opaque strings of numbers and parameters. A slug like /what-is-a-url-slug is more inviting than /p=1847.
Once a page is indexed, avoid changing its slug without setting up a 301 redirect. Changing a URL without redirecting breaks incoming links and causes a ranking reset as Google processes the new URL.
How to create a URL slug
You can create a slug manually or use a generator tool. The manual process: start with your page title or headline, convert to lowercase, replace spaces with hyphens, remove special characters, and remove stop words if the slug is too long.
Using the Slug Generator: paste your title and copy the result. The generator handles lowercasing, hyphenation, accent removal (é to e, ü to u), and special character stripping automatically. This is faster and avoids human error on titles with accented characters or unusual punctuation.
Frequently asked questions
What is the difference between a URL and a slug?
A URL is the full web address: https://example.com/blog/what-is-a-slug. A slug is just the final path segment: what-is-a-slug. The slug identifies the specific page within a site.
Should I include keywords in my URL slug?
Yes. Including your primary keyword in the slug is a confirmed minor SEO ranking factor and improves click-through rate by telling users and search engines what the page is about.
Can I change a URL slug after publishing?
You can, but you must set up a 301 redirect from the old URL to the new one. Without a redirect, any links pointing to the old URL will return 404 errors and the page will lose its search rankings.
What is a slug in WordPress?
In WordPress, a slug is the URL-friendly version of a post or page title, automatically generated from the title but editable in the Permalink field below the title in the page editor.
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