How to Write URL Slugs That Actually Help Your SEO — A Practical Guide

You publish a blog post with the title "10 Ways to Improve Your JavaScript Performance in 2026." Your CMS auto-generates the URL: /blog/10-ways-to-improve-your-javascript-performance-in-2026. That is 63 characters long. On a mobile search result, Google truncates URLs at around 60 characters. Your carefully crafted title becomes /blog/10-ways-to-improve-your-javascript-performanc… in the SERP. A URL slug generator helps — but only if you know what makes a good slug in the first place.

The rules of a good URL slug

1. Keep it under 60 characters. Shorter slugs rank slightly better and get clicked more often. "javascript-performance-tips" (29 chars) beats "10-ways-to-improve-your-javascript-performance-in-2026" (63 chars). The difference is not huge, but it compounds across hundreds of URLs.
2. Include your primary keyword. If your article is about JavaScript performance, those words should appear in the slug. The slug is a ranking signal — not the strongest one, but one you control completely.
3. Remove stop words. "the," "a," "an," "in," "on," "at," "to," "for," "of" — these add length without adding meaning. "ways-to-improve-javascript-performance" becomes "improve-javascript-performance." Same meaning, 10 characters shorter.
4. Use hyphens, not underscores. Google treats hyphens as word separators and underscores as word joiners. "javascript-performance" is read as two words. "javascript_performance" is read as one word. Use hyphens.
5. Lowercase only. Mixed-case URLs create duplicate content issues: /Blog/JavaScript and /blog/javascript are different URLs that serve the same content. Always lowercase.

How the slug generator works

The URL slug generator takes any text and converts it to a clean, URL-safe format. It lowercases everything, replaces spaces and special characters with hyphens, removes stop words, and strips accents from international characters (café → cafe, naïve → naive). Paste your title, get a clean slug in under a second.

For titles with special characters — ampersands, quotes, mathematical symbols — the generator handles the conversion that would otherwise require manual lookup. "Ben & Jerry's Ice Cream" becomes "ben-jerrys-ice-cream." Our URL encoder handles the opposite direction — encoding special characters for query parameters, where hyphens would be incorrect.

The slug mistakes that hurt your SEO

Auto-generated IDs as slugs. /blog/post-2847 tells Google nothing about your content. It tells users nothing about your content. If your CMS generates numeric slugs, override them with descriptive text. The slug is free real estate in your search snippet — use it.

Changing slugs after publishing. If you change a slug, the old URL returns a 404 unless you set up a 301 redirect. Every old link — from other sites, from social media, from bookmarks — breaks. Pick a good slug the first time and stick with it. The slug generator helps you get it right before you hit publish.

Keyword stuffing slugs. /best-javascript-performance-tips-optimization-speed-fast is not a slug; it is a spam signal. One or two keywords, not seven. The slug should read naturally — if you would not say it out loud, do not put it in a URL.

Dates in slugs. /blog/2026-06-24/javascript-performance locks your content to a specific date. When you update the article in 2027, the 2026 date makes it look outdated even though the content is fresh. Omit dates from slugs unless the date is essential to the content (news articles, event coverage).

For related text transformation tools, our case converter handles the other direction — converting slugs back to readable titles. And for a broader look at URL handling, see our beginner's guide to URL encoding and why it matters.