Technical SEO · URL Structure

What Is URL Structure in SEO?

URL structure shapes how your pages are organised. Here is what it is, what makes a good URL and slug, what parameters are and how to handle them, and subfolder versus subdomain.

Updated: July 2026
Written by: Andrew Odgers, Managing Director
Reading time: 9 minutes
The short answer

URL structure is how the addresses of your pages are organised: path, folders and slug. A good URL is short, readable, descriptive and consistent; the slug is the readable part identifying a page. URL parameters are the extra values after a question mark, which can duplicate content and are handled with canonical tags. A subfolder sits within your domain; a subdomain is more independent. Change existing URLs only with good reason and proper redirects.

Clear, logical addresses

What URL structure is, and good URLs and slugs

URL structure is how the addresses of your pages are organised, including the path, folders and slug, and how they reflect your site hierarchy. It affects clarity for users and search engines; because clear, logical URLs are easier to understand and manage, good URL structure supports usability and technical SEO. A good URL is short, readable, descriptive and consistent, and the slug is the readable part identifying a specific page, such as the words after the last slash. Clarity is the goal; because a clean slug describes the page and helps users and search engines, optimising slugs with clear, relevant words is worthwhile, and it complements a tidy sitemap.

UR 01

Readable

Short, descriptive slugs.

UR 02

Parameters

Handle to avoid dupes.

UR 03

Stable

Redirect if you change.

Parameters, subfolders and changing URLs

URL parameters, subfolder vs subdomain, and changing URLs

URL parameters are the extra values after a question mark in a URL, often used for filtering, tracking or sorting, which can create many similar URLs. They can cause duplication; because parameters can bloat crawling and duplicate content, handling them with canonical tags and careful configuration keeps things tidy, which ties into canonical tags. A subfolder is a section within your main domain, like example.com/blog, while a subdomain is a separate section, like blog.example.com, treated more independently. The choice affects how authority is grouped; because subfolders keep content under one domain, they are often preferred, though the right choice depends on your setup. You should change existing URLs only with good reason and always with proper redirects, since needless changes risk losing value. Stability is usually best; because changing URLs without care can break links and rankings, it should be planned, redirected and tested rather than done casually, exactly as in a site migration.

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Frequently asked

URL structure

What is URL structure in SEO?
URL structure is how the addresses of your pages are organised, including the path, folders and slug, and how they reflect your site hierarchy. It affects clarity for users and search engines. Because clear, logical URLs are easier to understand and manage, good URL structure supports usability and technical SEO.
What makes a good URL and what is a slug?
A good URL is short, readable, descriptive and consistent, and the slug is the readable part identifying a specific page, such as the words after the last slash. Clarity is the goal. Because a clean slug describes the page and helps users and search engines, optimising slugs with clear, relevant words is worthwhile.
What are URL parameters and how do you handle them?
URL parameters are the extra values after a question mark in a URL, often used for filtering, tracking or sorting, which can create many similar URLs. They can cause duplication. Because parameters can bloat crawling and duplicate content, handling them with canonical tags and careful configuration keeps things tidy.
What is the difference between a subfolder and a subdomain?
A subfolder is a section within your main domain, like example.com/blog, while a subdomain is a separate section, like blog.example.com, treated more independently. The choice affects how authority is grouped. Because subfolders keep content under one domain, they are often preferred, though the right choice depends on your setup.
Should you change existing URLs for SEO?
You should change existing URLs only with good reason and always with proper redirects, since needless changes risk losing value. Stability is usually best. Because changing URLs without care can break links and rankings, it should be planned, redirected and tested rather than done casually.