What Is a URL Slug?
A URL slug is the part of a web address that identifies a specific page in a human-readable format. In the URL https://toolscourt.com/blog/what-is-a-cron-expression, the slug is what-is-a-cron-expression. Slugs replace spaces with hyphens, remove special characters, and use lowercase letters to create URLs that are readable, memorable, and SEO-friendly.
Slug Best Practices for SEO
- Use hyphens, not underscores: Google treats hyphens as word separators.
word-counter is indexed as two words; word_counter is indexed as one word. - Keep it short: Aim for 3–5 words. Long slugs are truncated in search results and harder to share.
- Include the primary keyword: The slug is one of the strongest on-page SEO signals. Put your main keyword in the slug.
- Remove stop words: Words like "a", "the", "and", "of" add length without SEO value. "what-is-cron-expression" is better than "what-is-a-cron-expression".
- Use lowercase only: URLs are case-sensitive on most servers. Uppercase in slugs creates duplicate content risks.
- Avoid dates unless necessary: "guide-to-jwt" ages better than "2024-guide-to-jwt".
Unicode and International Slugs
Hindi titles like "क्रोन एक्सप्रेशन जनरेटर" cannot be used directly in URLs without percent-encoding, which produces ugly URLs like %E0%A4%95%E0%A5%8D%E0%A4%B0.... The standard approach for non-Latin titles is transliteration — converting characters to their closest ASCII equivalents — followed by standard slug processing. Our tool uses Unicode NFD normalisation to decompose characters and remove diacritical marks, producing clean ASCII slugs from titles in any language.
Should I change existing slugs to make them better?
Only if the SEO benefit is significant. Changing a URL breaks existing links and requires a 301 redirect. If a page has significant traffic and backlinks, changing the slug can temporarily hurt rankings even with a proper redirect. For new pages, invest in good slugs from the start.
What is the maximum length for a URL slug?
There is no hard limit, but Google recommends keeping URLs concise. Slugs over 60–70 characters are truncated in search results. Most SEO practitioners recommend 50 characters or less for the slug portion.