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What Makes a Good URL Slug?

Dev Nexus4 min read

The handful of rules - length, hyphens, lowercase, and stop words - that separate a clean, SEO-friendly slug from a messy one.

Two pages can cover the same topic and end up with very different URLs: /blog/9-Ways_To-Improve%20Your-SEO-in-2026 versus /blog/improve-seo. The second is easier to read, easier to share, and easier for search engines to parse. The difference comes down to a small set of slug best practices.

This post breaks down what actually makes a slug good - length, casing, separators, and stop words - so you can judge any URL at a glance and write better ones yourself.

The Problem

Most bad slugs are not the result of one big mistake but of ignored defaults. A CMS keeps the capital letters from the title, encodes spaces as %20, or pastes an entire twelve-word headline into the URL. Someone uses underscores because they look tidy in code, or leaves in every the and of from the title.

Individually these seem harmless, but they add up. Mixed case can spawn duplicate URLs. Underscores blur word boundaries for search engines. Overlong slugs get cut off in results and are painful to share. And once a page is published, the messy slug tends to stay, quietly working against you on every link.

The Solution

A good slug is short, lowercase, hyphen-separated, and descriptive - and nothing more. Concretely that means: aim for three to five meaningful words, lowercase every letter, join words with single hyphens, strip accents to plain ASCII, and drop stop words that carry no meaning. The goal is a URL a person could read aloud and roughly guess the page's content from.

Rather than remembering to apply each rule by hand, let the Slug Generator enforce them for you. Paste a title and it returns a clean slug live as you type, all in your browser with nothing uploaded. When you specifically need to normalise casing across text - not build a URL - the Case Converter is the right companion tool.

Step-by-Step Guide

1
Keep it short and descriptive
Target three to five meaningful words. The slug should hint at the page's content without repeating the whole title. beginners-guide-to-sourdough beats the-complete-absolute-beginners-guide-to-baking-sourdough-bread-at-home.
2
Use lowercase everywhere
Lowercase the entire slug. Some servers treat /Page and /page as different URLs, which splits link equity and can produce duplicate content. All-lowercase sidesteps the whole problem.
3
Separate words with hyphens
Use single hyphens between words - never spaces, underscores, or camelCase. Search engines read hyphens as spaces, so url-slug is understood as two words while url_slug may read as one.
4
Remove unnecessary stop words
Drop small filler words - a, an, the, of, and, to - when the slug still makes sense without them. This shortens the URL and sharpens its focus on the real keywords.
5
Keep it stable and meaningful
Choose a slug you will not need to change, and make it reflect the content rather than a date or id. A stable, descriptive slug keeps links working and stays relevant even as the page is updated.

Common Mistakes

Stuffing in every keyword
Cramming a slug with repeated or loosely related keywords looks spammy and reads badly. Pick the two or three terms that genuinely describe the page and stop there.
Dating slugs you will want to reuse
Baking 2026 or a full date into an evergreen page's slug makes it look stale next year and tempts you into a risky rename. Leave dates out unless they are essential to the content.
Mixing separators
Using hyphens on some pages and underscores or camelCase on others makes your URLs inconsistent and harder to predict. Pick hyphens and apply them everywhere.
Dropping stop words that change meaning
Removing a stop word is good only when meaning survives. history-of-art should not become history-art if that reads oddly - keep the word when it earns its place.

Frequently Asked Questions

How long should a URL slug be?

Short - roughly three to five meaningful words. Concise slugs are easier to read and share and are less likely to be truncated in search results. There is no hard character limit, but shorter is generally better.

Should I always remove stop words from slugs?

Usually, but not blindly. Drop words like `the` and `of` when the slug still makes sense, since they shorten the URL. Keep a stop word when removing it would make the slug read awkwardly or change its meaning.

Are hyphens or underscores better in slugs?

Hyphens. Search engines treat hyphens as word separators but underscores as joiners, so hyphens help each word be recognised. Use hyphens consistently across your whole site.

Does capitalisation in a slug matter?

Yes. On many servers URLs are case-sensitive, so `/About` and `/about` can be two different pages. Using all-lowercase slugs avoids duplicate URLs and broken links.

Can a good slug improve my search ranking?

A clean, descriptive slug is a minor ranking signal, but its bigger benefit is usability: readers see a clear, trustworthy link, which can lift click-through from search results and encourage sharing.