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SEO-Friendly URL Slugs: Rules, Examples and Mistakes

By : Safdar Waraich | Last updated: 31 October 2026

Look at the address bar of any web page. Some addresses are clear, such as example.com/blog/how-to-write-meta-description. Others are a puzzle, such as example.com/index.php?id=4827&cat=3. You can guess what the first page is about before you open it. The second tells you nothing.

The last part of a web address, the part that names the page, is called the slug. It is a small detail, but it appears in search results, in links that people share, and in the address bar. A good slug makes your page easier to understand and to trust. A bad one can confuse visitors and cause trouble later, especially if you need to change it.

In this guide you will learn what a slug is, the simple rules for writing a good one, how to handle special characters and other languages, and what to do if you must change a slug on a page that is already live.

What is a URL slug?

A URL (web address) has several parts. In this address:

https://www.example.com/blog/seo-friendly-url-slugs

• https is the protocol.
• www.example.com is the domain.
• /blog/ is a folder or section.
• seo-friendly-url-slugs is the slug, the part that identifies this particular page.

You normally set the slug when you create or edit a page or a post. Most admin panels fill one in automatically from the title, but the automatic version is often too long or contains words you would rather leave out. Taking a minute to edit it is one of the cheapest improvements you can make.

Do slugs affect rankings?

A little, but not much. A slug is at most a small signal. Its main value is clarity. A readable slug helps visitors understand where a link leads before they click, it looks more trustworthy when someone pastes it in a message, and it helps you keep your own site organized. Google’s guidance on URL structure also asks for simple, readable addresses, partly because they are easier to crawl and to understand.

So do not expect a perfect slug to push a weak page up the results. Write a good slug because it makes the site better for people, and treat any ranking benefit as a bonus.

The rules for a good slug

1. Use lowercase letters

Some servers treat /Word-Counter and /word-counter as two different addresses. If both work, you may create duplicate pages without meaning to. Lowercase everywhere avoids the problem.

2. Separate words with hyphens

Google recommends hyphens, because it treats a hyphen as a separator between words. Underscores are not treated the same way, so seo_tools can be read as one long word. Spaces are not allowed in addresses, and when they appear they become %20, which is ugly and hard to read.

3. Keep it short and descriptive

There is no official length limit, but shorter is easier to read, copy and share. Three to five meaningful words is a good target. A slug should describe the page in a way that a person could guess from the address alone.

4. Include the main topic, once

Put the main phrase of the page in the slug in plain language. Do not repeat it or stuff in extra keywords. best-seo-tools is fine. best-seo-tools-best-free-seo-tool-seo-tools-online looks like spam and helps nobody.

5. Leave out words that add nothing

Words such as “a”, “the”, “and”, “of” and “to” can often be removed to shorten a slug. But do not remove them if the meaning becomes unclear. how-to-write-meta-description is clear and short enough, while write-meta-description is also acceptable.

6. Avoid special characters

Keep to letters, numbers and hyphens. Characters such as ? # & % $ @ ! , ; : ' " ( ) have special jobs in addresses, or need to be encoded. Remove them from the slug rather than trying to keep them.

7. Avoid dates and numbers that will go out of date

A slug that contains a year, such as best-seo-tools-2023, looks old once the year has passed, and you may feel pressed to change it. If you update the article every year, leave the year out of the slug and put it in the title. Numbers that are part of the topic itself, such as 10-best-seo-tools, are fine. (Even there, if the number of items may change, think before you use it.)

8. Make every slug unique

Two pages in the same section should not have the same slug. Most systems will add a number like -2 to the second one, which is a sign that you probably have two pages about the same thing.

9. Avoid unnecessary parameters and IDs

Addresses such as ?id=4827&cat=3 are harder to read, harder to remember and more likely to create duplicate versions of a page. Where your system lets you, use readable, words-only paths.

Before and after: eight examples

Notice the patterns: the better versions are lowercase, use hyphens, drop punctuation, and say the same thing in fewer words.

Create slugs quickly with a tool

If you are not sure how to clean up a title, paste it into the Text to Slug tool. For the title 10 Best SEO Tools for Beginners (2026 Guide)!, a typical result is:

10-best-seo-tools-for-beginners-2026-guide

The tool lowercased the text, replaced spaces with hyphens and removed the brackets and the exclamation mark. After that, you can shorten it by hand, for example to best-seo-tools-for-beginners. Check the result before you use it, because a tool cannot know which words matter most for your page.

Special characters and encoding

Web addresses can only contain a limited set of characters. If other characters appear, they are converted into percent-encoding: a percent sign followed by two hexadecimal digits. A space becomes %20, an ampersand becomes %26, and the letter é becomes %C3%A9. You can try this with the URL Encode tool.

Percent-encoded addresses work, but they are ugly. A link that is supposed to read cafe-munster-guide but shows up as caf%C3%A9-m%C3%BCnster-guide is hard for people to read, and it looks suspicious in a message. The simplest fix is to use plain letters in your slug.

Slugs in other languages

If your site is written in Urdu, Arabic, Hindi or another language with its own script, you have a choice to make.

Option 1: a slug in the native script. Modern browsers can show it in the address bar. But when you copy the link into an email or a chat, it often turns into a long percent-encoded string. For example, the Urdu word اردو becomes %D8%A7%D8%B1%D8%AF%D9%88. That is hard to read, easy to break, and unpleasant to share.

Option 2: a short English or transliterated slug. You keep the page title in the original language, and use a short Latin-letter slug, such as urdu-typing-guide. Links stay clean, and they are easy to type and share.

Both approaches can work. What matters most is to choose one and use it consistently across the whole site. If your visitors mostly search in a native script, you may decide to use it. If you share links widely, Latin-letter slugs are often more practical. Whichever you choose, test your links in the places where you plan to share them.

Keep the structure simple

Slugs sit inside a structure. A site with /blog/ for articles, /tools/ for tools and /about-us for company pages is easy to understand. Avoid very deep structures such as /blog/2026/10/30/seo/tools/article-name, which are hard to read and make every address long. A shallow structure with clear names is almost always better.

Also avoid putting the same words in every level. In /tools/word-counter-tool/word-counter-online, the repetition does not add information.

Changing a slug on a live page

Sometimes you must change a slug, for example because it contains a typo or the topic has changed. The rule is simple: do not change a slug on a page that already has traffic or links unless you have a good reason, and if you do, set up a redirect.

If you change /old-slug to /new-slug and do nothing else, the old address will return a “not found” error. Visitors who use old links land on an error page, and any value that page had earned from other sites is cut off.

The safe process is:

1. Change the slug in your admin panel.
2. Create a 301 redirect from the old address to the new one. If you need help, read our guide to 301 vs 302 redirects and use the htaccess Redirect Generator if your site runs on Apache.
3. Update your internal links so that they point straight to the new address.
4. Update your sitemap and any canonical tag to the new address.
5. Test the old address with the Redirect Checker, and confirm a single 301 followed by a 200.
6. Keep the redirect in place for a long time.

Some systems create the redirect for you when you change a slug. Do not assume it. Test it.

Common mistakes

• Leaving the automatic slug. Long titles often turn into very long slugs. Always read and shorten them.
• Capital letters, spaces and underscores. They create ugly, inconsistent addresses and possible duplicates.
• Keyword stuffing. A slug is not a place for a list of keywords.
• Putting the year or a version number in a slug that you intend to keep updating.
• Changing slugs without redirects. This creates broken links and loses visitors.
• Using two addresses for one page, such as one with and one without a trailing slash, without choosing a preferred version.
• Leaving default slugs such as post-1234 or untitled, which say nothing about the content.
• Mixing styles. Some pages in English with hyphens, others in another script with underscores. Pick a style and stay with it.

A quick checklist

• Is the slug lowercase, with hyphens between words?
• Is it short (about three to five meaningful words)?
• Does it describe the page and contain the main topic once?
• Does it contain only letters, numbers and hyphens?
• Is it free from dates and numbers that will become outdated?
• Is it unique on my site?
• If I changed it, did I add a 301 redirect, update internal links and update the sitemap?
• Have I tested the final address in a private browser window?

Common questions

Should the slug match the title exactly?
Not necessarily. A shorter version with the main topic is often better.

Are hyphens or underscores better?
Hyphens. Google treats them as word separators.

Does a slug need to contain my keyword?
It helps to include the main topic in clear language, but do not force it.

How long can a slug be?
There is no fixed limit, but short slugs are easier to read and share. Aim for three to five words.

Can I use numbers in a slug?
Yes, when they are part of the topic, as in 10-best-seo-tools. Avoid numbers that will go out of date.

Should I change my old slugs to make them better?
Only if they are really poor and the page is not performing. Changing slugs always carries some risk, so weigh the benefit against the effort of redirects.

Final thoughts

A good slug is short, lowercase, readable and honest about what the page contains. It will not rescue a weak page, but it makes every page easier to understand, share and maintain. Most importantly, once you publish a page and others start linking to it, treat its address with care.

Start with the page you are about to publish. Write the slug by hand, check it with the Text to Slug tool, and read it aloud. If it makes sense to you, it will make sense to your visitors.