URL Slug Best Practices

What a slug is

In the address yoursite.com/blog/how-to-bake-bread, the bold part is the slug. It is the piece of the URL that identifies one specific page in words rather than codes. A clear slug tells a reader what to expect before they click, and gives search engines a clean signal about the page's topic.

The rules of a good slug

• Use lowercase only. Web addresses can be case-sensitive, so /My-Page and /my-page may be treated as two different pages. Sticking to lowercase avoids duplicates.
• Separate words with hyphens, not underscores. Search engines read hyphens as spaces between words; underscores join words together. Use red-shoes, not red_shoes.
• Keep it short and meaningful. Include the main keywords, but trim filler. /best-running-shoes beats /the-10-best-running-shoes-you-should-buy-this-year.
• Describe the page. The slug should make sense on its own, even without the page title next to it.
• Use plain ASCII letters and numbers. Spaces, accents and symbols get converted into messy codes like %20, which look broken when shared.
• Drop small stop words like "a", "the" and "and" when they add nothing, to keep the slug tight.

What to avoid

• Dates and numbers you may change: /2024/post-1 ages badly and breaks if you reorganise.
• Keyword stuffing: repeating the same word (/shoes-shoes-cheap-shoes) looks spammy and helps no one.
• Spaces and special characters: they encode into ugly, fragile URLs.
• Changing slugs after publishing. A live URL may be linked, bookmarked and indexed. If you must change it, set up a redirect from the old address to the new one so nothing breaks.

Good vs bad slugs

A few before-and-after examples make the rules concrete:

• ❌ /Blog/My_First_Post%20(2024) → ✅ /blog/my-first-post — lowercase, hyphens, no codes or dates.
• ❌ /p?id=8842 → ✅ /best-budget-headphones — words a person and a search engine can read.
• ❌ /the-ultimate-complete-guide-to-everything-about-coffee-brewing → ✅ /coffee-brewing-guide — short and focused.

The pattern is always the same: readable words, lowercase, hyphen-separated, and no more than you need.

A simple workflow

Take your page title, make it lowercase, remove punctuation, and replace spaces with hyphens. "10 Tips for Better Sleep!" becomes 10-tips-for-better-sleep. Then trim any words that aren't needed. A slug generator does all of this automatically — paste a title and it returns a clean, safe slug you can use straight away, handling accents, symbols and double spaces for you so the result is always valid.

Try the free Slugify — URL Slug Generator →
Turn any title into a clean, lowercase, hyphenated URL slug automatically.

Frequently asked questions

Should I use hyphens or underscores in a URL?

Use hyphens. Search engines treat hyphens as spaces between words, but read underscores as joining words together. So 'blue-widget' is understood as two words, while 'blue_widget' may be read as one.

Does the URL slug affect SEO?

Yes, modestly. A short, descriptive, keyword-relevant slug helps search engines and people understand the page, and clean URLs are easier to share and click. It is one of many ranking signals, not a magic switch.

Can I change a slug after publishing?

You can, but be careful: the old URL may already be linked or bookmarked. If you change it, add a redirect from the old slug to the new one so existing links keep working.