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What Is a URL Slug? A Complete Guide

5 min read

A URL slug is the part of a web address that identifies a specific page in a human-readable format. In the URL https://example.com/what-is-a-url-slug, the slug is what-is-a-url-slug.

The term “slug” comes from the newspaper industry, where a slug was a short name given to an article during production. In web development, the concept works the same way—a slug is a short, descriptive label that identifies a specific page.

Why URL Slugs Matter for SEO

URL slugs are one of the simplest SEO signals you can control. Search engines like Google use the URL to understand what a page is about. A descriptive slug gives both Google and users immediate context about the page content.

Consider these two URLs:

  • example.com/p?id=1234— tells nothing about the content
  • example.com/what-is-a-url-slug— clearly describes the page topic

Google has confirmed that keywords in URLs are a minor ranking factor. While they won’t single-handedly get you to page one, they contribute to the overall relevance signal and improve click-through rates from search results.

Anatomy of a Good URL Slug

A well-crafted URL slug has these characteristics:

  1. Lowercase— URLs are case-sensitive on most servers. Using lowercase avoids duplicate content issues.
  2. Hyphen-separated— Google treats hyphens as word separators but doesn’t treat underscores the same way.
  3. Descriptive— Contains relevant keywords that describe the page content.
  4. Concise— Generally under 60 characters. Shorter slugs are easier to read and share.
  5. No special characters— Only uses letters (a-z), numbers (0-9), and hyphens (-).

How URL Slugs Are Created

The process of creating a URL slug (called “slugification”) typically involves:

  1. Taking the page title or a descriptive phrase
  2. Converting it to lowercase
  3. Replacing spaces with hyphens
  4. Removing special characters and punctuation
  5. Transliterating accented characters (é → e, ü → u)
  6. Collapsing multiple consecutive hyphens into one
  7. Trimming hyphens from the start and end

For example, the title “Café Menu — Special Édition (2024)!” becomes the slug cafe-menu-special-edition-2024.

You can automate this process using our Slug Generator, which handles all these steps instantly in your browser.

Common URL Slug Mistakes

  1. Including stop words unnecessarily— Words like “a”, “the”, “is”, “and” add length without value. “the-complete-guide-to-the-best-url-slugs” can be shortened to “url-slug-guide”.
  2. Using IDs instead of slugs — URLs like /post/12345 waste the SEO opportunity of having keywords in the URL.
  3. Changing slugs after publishing— Once Google indexes a URL, changing the slug creates a 404 error unless you set up a redirect. Only change slugs when absolutely necessary.
  4. Keyword stuffing— Cramming every possible keyword into a slug looks spammy and can hurt rather than help.
  5. Using underscores— Google explicitly recommends hyphens over underscores. The Kebab Case Converter ensures your text uses the correct format.

URL Slugs in Different Platforms

Most content management systems generate slugs automatically:

  • WordPress creates slugs from the post title but lets you edit them
  • Shopify generates product slugs from the product name
  • Ghost and Hugo use the title as the default slug
  • Next.js and Gatsby use file names or programmatic routing

For custom applications, you can use our Text to Slug converter to generate slugs that work with any platform.

Summary

URL slugs are a small but important part of SEO and web development. They help search engines understand your content, improve click-through rates, and make URLs more user-friendly. The best slugs are short, descriptive, lowercase, and use hyphens as separators.