SEOApril 2026 · 5 min read

How to Generate SEO-Friendly URL Slugs

A URL slug is the human-readable part of a URL that identifies a specific page — the 'how-to-generate-slug-url' in this page's address. Clean, descriptive slugs improve SEO, readability, and shareability. The Slug Generator converts any title or text into a properly formatted URL slug instantly.

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Derek Giordano

Designer & Developer

In this guide

01What Makes a Good Slug02Conversion Rules03SEO Best Practices for URLs04Generating Slugs in Code

⚡ Key Takeaways

Convert titles to clean URL slugs.
What Makes a Good Slug.
Covers conversion rules.
Covers seo best practices for urls.
Covers generating slugs in code.

What Makes a Good Slug

Lowercase only — URLs are case-sensitive on many servers. Hyphens between words (not underscores — Google treats hyphens as word separators but underscores as joiners). No special characters, accents, or spaces. Short and descriptive — include your target keyword. No stop words unless they aid readability ('how-to-create-css-gradient' is better than 'how-to-create-a-css-gradient-for-your-website').

Conversion Rules

The Slug Generator applies these transformations: converts to lowercase, replaces spaces with hyphens, removes special characters (!@#$%^&*), transliterates accented characters (ü→u, é→e, ñ→n), collapses consecutive hyphens into one, trims leading/trailing hyphens. Example: 'How to Create CSS Gradients — A 2026 Guide!' becomes 'how-to-create-css-gradients-a-2026-guide'.

💡 Tip

Use 3+ color stops instead of 2 to avoid the muddy gray band that appears in the center of complementary-color gradients.

SEO Best Practices for URLs

Keep slugs under 60 characters. Include your primary keyword near the beginning. Use folder structure for hierarchy: /blog/css-gradient-guide/ not /blog/2026/04/15/complete-guide-to-css-gradients-for-web-designers/. Never change a slug after publishing without setting up a 301 redirect — broken URLs lose all accumulated link equity and search ranking.

⚠ Warning

CSS gradients used as backgrounds cannot be animated with standard transitions. Use background-size animation or @property registered custom properties instead.

Generating Slugs in Code

JavaScript: text.toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/(^-|-$)/g, ''). Python: import re; re.sub(r'[^a-z0-9]+', '-', text.lower()).strip('-'). Most CMS platforms (WordPress, Ghost, Strapi) generate slugs automatically from the title — but it's worth reviewing them manually for length and keyword inclusion.

Frequently Asked Questions

What is a URL slug?+

A slug is the human-readable part of a URL that identifies a page. In 'example.com/blog/css-gradient-guide/', the slug is 'css-gradient-guide'. Good slugs are short, descriptive, and include target keywords.

Should I use hyphens or underscores in URLs?+

Hyphens. Google treats hyphens as word separators (css-gradient = two words) but treats underscores as joiners (css_gradient = one word). Hyphens are the universal standard.

Can I change a URL slug after publishing?+

You can, but always set up a 301 redirect from the old URL to the new one. Without a redirect, you lose all search ranking and inbound links associated with the original URL.

Try it yourself

Use the Slug Generator — free, no signup required.

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Derek Giordano

Written by the creator of Ultimate Design Tools. BA in Business Marketing.

📚 References & Further Reading