Should I change an existing URL slug to improve SEO?

Only if genuinely bad — no keywords, too long, or underscores. Implement a 301 redirect immediately if you change it and update all internal links.

Does slug length affect SEO rankings?

Shorter slugs are generally better for shareability and display. No official maximum but slugs over 100 characters are rarely beneficial. Include the primary keyword.

Should every page on my site have a custom slug?

Focus on important pages: posts, service pages, products, landing pages. Tag archives and pagination auto-slugs are fine to leave.

Can two different pages have the same slug?

Not within the same directory. Different subdirectories can share slug names but this causes confusion and is best avoided.

What Is a URL Slug and How to Create SEO-Friendly Slugs

A URL slug is the part of a web address that identifies a specific page — the readable, human-friendly portion that comes after the domain name and any subdirectory. In the URL https://toolchecking.com/what-is-a-url-slug, the slug is "what-is-a-url-slug." Slugs seem like a minor detail, but they affect SEO, shareability, user experience, and how well your URLs age as your content evolves. Getting them right from the start saves a lot of redirect management later.

Generate clean, SEO-friendly slugs from any title or text instantly with our free Slug Generator tool. For related URL tools, our URL Parser breaks down complete URLs and our URL Encoder handles special characters in URLs.

What Makes a Good URL Slug

A good slug is short, readable, descriptive, and contains the primary keyword for the page. Bad slugs either include too much information (every word of a long title), too little (just a number or ID), or contain characters that cause encoding issues.

Rules for SEO-Friendly Slugs

Use lowercase letters only: URLs are technically case-sensitive on most servers. /My-Page and /my-page can be treated as different URLs. Always use lowercase to avoid duplicate content issues and inconsistency. Use hyphens, not underscores: Google treats hyphens as word separators (how-to-create becomes three words: how, to, create). Underscores are not word separators — how_to_create is treated as one word by Google. Always use hyphens. Remove stop words: words like "a," "an," "the," "and," "or," "in," "of" rarely add SEO value and make slugs longer. "how-to-create-a-url-slug" becomes "how-to-create-url-slug." Use judgment — sometimes removing stop words makes the slug harder to read. Keep it short: slugs under 5 words are ideal. Longer slugs are harder to type, truncate in browser tabs and social media previews, and look messier when shared. Aim for the shortest version that still describes the page clearly. Include the primary keyword: the slug is one of the most important on-page SEO signals. The page title is "How to Create a Professional Email Signature — A Complete Guide" but the slug should just be "professional-email-signature" or "create-email-signature." No special characters: avoid apostrophes, commas, question marks, exclamation points, and other punctuation. These require URL encoding and create messy-looking URLs. Our URL Encoder shows how special characters are encoded.

Slug Examples — Good vs Bad

Article title: "15 Ways to Improve Your Website Speed in 2025" Bad slug: /15-ways-to-improve-your-website-speed-in-2025 (too long, year dates it) Better slug: /improve-website-speed Best slug: /website-speed-tips (short, keyword-focused, does not date)

Article title: "What Is DNS and How Does It Actually Work?" Bad slug: /what-is-dns-and-how-does-it-actually-work (long, includes stop words) Better slug: /what-is-dns-how-it-works Best slug: /how-dns-works (concise, answers the intent directly)

Product page: "Premium Blue Leather Wallet — Handmade" Bad slug: /product?id=4782 (no keywords, not human-readable) Better slug: /premium-blue-leather-wallet-handmade Best slug: /blue-leather-wallet (clear, short, keyword-rich)

When to Include Numbers in Slugs

Dates in slugs (/website-speed-tips-2025) date your content and create duplicate content risk if you update the article in 2026 and change the slug. Numbers that are part of the core meaning (/top-10-seo-tools) are acceptable. Avoid dates unless the page is genuinely time-specific (event pages, news articles with specific publication dates).

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Slug Best Practices for WordPress

WordPress auto-generates slugs from post titles. The default behaviour takes the full title, converts to lowercase, replaces spaces with hyphens, and removes some special characters. This auto-generated slug is almost always too long and often includes stop words that add no SEO value.

Always edit the slug before publishing. In the WordPress post editor, the slug field appears below the title in the URL section (classic editor) or in the right sidebar under Permalink (block editor). Click edit and replace the auto-generated slug with your optimised version.

For existing published posts: changing a slug creates a new URL. WordPress will automatically create a redirect from the old URL to the new one if you have a redirect plugin installed (like Redirection or Yoast SEO Premium), but the old URL will no longer be the canonical address. Update any internal links that point to the old slug. Use our URL Redirect Checker to verify the redirect is working correctly after making the change.

Check your site is correctly configured and accessible to Google by running it through our SSL Lookup and HTTP Headers Lookup tools to confirm everything is in order before publishing new content.

Slug Localisation and International URLs

For multilingual websites, URL slugs in languages that use non-Latin scripts (Arabic, Chinese, Japanese, Korean, Cyrillic) present a challenge. The characters must be percent-encoded in the actual HTTP request, which creates URLs that look like a string of % codes when copied and pasted — not ideal for sharing.

Three common approaches: translate the slug into the Latin transliteration of the language (works reasonably well for most languages, poor for Chinese), use language-prefix directories with English slugs (/ar/how-dns-works), or use Unicode slugs that browsers display in the decoded form in the address bar but encode in HTTP requests.

For international domain names (IDN) — domains in non-Latin scripts — our IDN Punnycode Converter converts between the human-readable Unicode form and the ASCII-compatible encoding used in the DNS system.

Frequently Asked Questions

Only if the current slug is genuinely bad — contains no keywords, is extremely long, or uses underscores. The SEO benefit of a better slug must outweigh the cost of losing link equity accumulated at the old URL and the risk of broken links. For established pages with significant backlinks, keep the slug and improve other on-page elements instead. If you do change it, implement a proper 301 redirect immediately and update all internal links.

A URL slug is the readable part of a web address that comes after the domain name. For example, in example.com/blog/what-is-a-url-slug, the slug is what-is-a-url-slug.

A URL slug example is best-seo-tools in the URL example.com/blog/best-seo-tools. A good slug is short, lowercase, descriptive, and uses hyphens between words.

URL slug means the custom text part of a URL that identifies a specific page. It helps users and search engines understand what the page is about before opening it.

Shorter slugs are generally better — not because length directly affects ranking, but because shorter URLs are more shareable, display better in search results, and are less likely to be truncated in social media previews. Google's official guidance does not specify a maximum length, but slugs over 100 characters are rarely beneficial. The most important factor is that the slug contains the primary keyword for the page.

Yes, for important pages: blog posts, service pages, product pages, landing pages. For less important pages like tag archives, category archives, author pages, and pagination, the auto-generated slugs are usually fine and not worth optimising. Focus your slug effort on pages you want to rank for specific keywords.

Not within the same directory. /blog/how-dns-works and /guides/how-dns-works are different URLs despite the same slug because they are in different subdirectories. Within the same directory, slugs must be unique — your CMS will typically enforce this and append a number to prevent duplicates. Duplicate slugs across different directories are technically valid but can cause confusion and are best avoided.