What is a URL Slug?
A URL slug is the part of a web address that identifies a specific page in human-readable form. It comes after the domain name and any directory path, and it describes the page content using lowercase words separated by hyphens.
The term "slug" comes from newspaper typesetting — a short label used to identify a story in production. In web development, it serves the same purpose: a concise, URL-safe label for a piece of content.
Generate a clean, SEO-friendly slug from any title instantly — free, no sign-up.
Open Slug Generator →Why Slugs Matter for SEO
URL slugs are a confirmed on-page SEO factor. Google reads the URL of a page to understand its topic — and a clear, keyword-rich slug reinforces the relevance signal that your title tag and content already send.
- Keyword relevance — a slug containing your target keyword tells Google exactly what the page is about before it even crawls the content.
- Click-through rate — users see the URL in search results, bookmarks, and social shares. A readable slug builds trust and encourages clicks.
- Link anchor text — when other sites link to you without custom anchor text, the URL itself becomes the anchor. A descriptive slug is better link equity than a random ID.
- Crawl efficiency — clean slugs help search engine bots understand site structure and crawl more efficiently.
Include your primary keyword in the slug. Keep it short. Use hyphens. Never change a slug after a page is indexed without setting up a 301 redirect.
Good vs Bad Slugs
Here's how the same page title translates into slugs of different quality:
7 Slug Best Practices
Use lowercase only
URLs are case-sensitive on most servers. Always use lowercase to avoid duplicate content issues from URL variants.
Use hyphens, not underscores
Google treats hyphens as word separators. Underscores join words together, reducing keyword matching effectiveness.
Keep it short
Aim for 3–5 words. Remove filler words like "a", "the", "and", "in", "of" unless they're part of the keyword.
Include your keyword
Put the target keyword at the start of the slug when possible. It carries more weight near the beginning of the URL.
No special characters
Avoid ?, #, %, &, spaces, or any character that needs URL encoding. Stick to letters, numbers, and hyphens.
Never change without a redirect
Once a URL is indexed, changing the slug without a 301 redirect destroys accumulated backlink equity and rankings.
Use ASCII characters
For non-English content, transliterate accented characters (é → e, ü → u) rather than using encoded Unicode in URLs.
Hyphens vs Underscores
This is one of the most commonly misunderstood slug rules — and getting it wrong has a direct impact on search rankings.
Google's John Mueller has confirmed that hyphens are treated as word separators, while underscores join words together. This means:
word-counter→ Google reads as two words: "word" + "counter" ✓word_counter→ Google reads as one word: "wordcounter" ✗
If your target keyword is "word counter" (two words), the hyphenated version matches the search query directly. The underscored version does not match either word individually.
Always use hyphens in URL slugs. The only exception is if your CMS or framework enforces underscores — in which case this is a platform limitation, not a choice.
Should You Remove Stop Words?
Stop words are common words like "a", "an", "the", "and", "in", "of", "for", "to", "with". The traditional SEO advice was to remove them from slugs to keep URLs short. The current guidance is more nuanced.
- Remove stop words when they add no meaning — "how-to-calculate-percentage" is cleaner than "how-to-calculate-a-percentage".
- Keep stop words when they form part of a phrase — "lord-of-the-rings" should not become "lord-rings" — the stop words are part of the brand.
- Keep stop words when removing them changes the meaning — "how-not-to-fail" vs "how-fail" are very different.
As a rule of thumb: read the slug aloud. If it still makes sense without the stop words, remove them. If it sounds wrong or changes the meaning, keep them.
Slugs in Popular CMS Platforms
Most content management systems auto-generate slugs from your page title. Here's how the major platforms handle them:
| Platform | Auto-generate | Default separator | Where to edit |
|---|---|---|---|
| WordPress | Yes | Hyphens | Post editor → Permalink field |
| Webflow | Yes | Hyphens | Page settings → Slug field |
| Shopify | Yes | Hyphens | Product/page editor → URL handle |
| Ghost | Yes | Hyphens | Post settings → URL field |
| Wix | Yes | Hyphens | Page SEO settings → URL |
| Custom HTML/JS | No | Manual | File name / router config |
Auto-generated slugs often include stop words and are too long. Always review and manually edit the auto-generated slug before publishing — especially for pages targeting specific keywords.
How to Generate a Slug Online
Creating a clean slug manually means remembering all the rules every time. Our free Slug Generator automates the entire process:
- Open the Slug Generator Tool.
- Paste or type your page title or heading.
- The tool instantly converts it to a clean slug — lowercase, hyphens, no special characters.
- Review and optionally shorten by removing stop words.
- Copy the slug with one click.
- Paste it into your CMS's permalink or URL field.
Input: "How to Calculate Body Mass Index (BMI) — Step-by-Step Guide 2026"
Output: how-to-calculate-body-mass-index-bmi-step-by-step-guide-2026
Shortened: calculate-bmi-guide
Generate a clean SEO-friendly slug from any title — free, instant, no sign-up required.
Open Slug Generator →Frequently Asked Questions
Conclusion
A good URL slug is short, keyword-focused, lowercase, and hyphen-separated. It takes ten seconds to write a good one — and those ten seconds can make a measurable difference to how your page ranks, how users perceive your site, and how link equity accumulates over time.
Use our free Slug Generator to convert any title into a clean, SEO-ready slug automatically — no more manually removing special characters or converting spaces to hyphens.
Generate clean, SEO-friendly slugs from any title in one click — free, browser-based.
Open Slug Generator →