If you are reading this, you probably saw something weird in your URL structure, maybe while reviewing crawl data, or maybe while debugging a stubborn page in Google Search Console. An extra forward slash here and there: are these duplicates? Will it affect SEO? Is it even a problem? According to Google’s Gary Illyes, yes, double slashes don’t break the rules, but they might still break your performance if left unchecked. This article breaks it all down for you, clearly and practically.
What Is a Double Slash URL Error?
“If your site has two URLs for the same page, search engines have to guess which one matters. That’s not a good place to be,” says Bill Fukui of MedShark Digital.
Sometimes, a double slash sneaks in without anyone noticing. Maybe a developer updated the routing logic. Maybe a plugin started spitting out messy paths. Either way, you’re looking at URLs like example.com//services/consulting, and they’re sitting right alongside the cleaner version. Are they the same page? Is it just cosmetic? Unfortunately, search engines don’t always treat them that way, and now you’ve got multiple versions of a single resource floating around.
This kind of thing is more common than most people realize, especially on sites with automated content generation or custom URL handling. While Google has stated that technically, double slashes are fine, the key word there is “technically.” In practice, they can create crawl inefficiencies, indexing confusion, and duplicate signals that impact performance. Because of this, it’s not something you should just brush off as harmless formatting. If you’re seeing these URLs pop up in live environments, it’s worth a closer look.What Google Says About SEO Impact
During a live Q&A, Google’s Gary Illyes gave his thoughts on whether URLs with double forward slashes, like //shop, could hurt SEO. According to the web standard (RFC 3986), it’s technically allowed. A slash is just a separator, and if a site happens to have two back-to-back, it’s not against the rules.
However, Gary did not recommend it. He pointed out that while it might not tank your rankings overnight, it’s not a great look for usability or crawlability. Search engines like things tidy, and double slashes can feel messy. It’s one of those technical quirks that won’t always trip you up, but when it does, it’s a pain to fix. Why take the risk? A clean URL structure helps your pages get indexed properly, reduces crawl waste, and makes your site easier to maintain long-term.
How to Spot and Fix It
Now that you understand what’s going on behind the hood, the obvious question is: what should you do about it? The good news is that this is not one of those problems that cannot be fixed. You don’t need to rip your site apart or reinvent your CMS. But you do need to take it seriously. Catching and correcting these double slashes early can save you from long-term indexing headaches, and it starts with a few targeted steps:
- Use Screaming Frog or Google Search Console to crawl your site and flag any duplicate or unexpected URL paths. Look for double slashes that don’t belong.
- Loop in your developer or SEO team to check for sloppy URL generation in CMS templates, plugins, or .htaccess rules.
- Don’t settle for a simple redirect. Redirects patch the symptom, but the cleaner fix is to stop the issue at the source.
- Set up regular audits. Tools like Screaming Frog or Sitebulb can schedule crawls, helping you catch structural issues before they do any damage.
Conclusion
You don’t have to be a coder or SEO expert to handle anything like this; you only need the correct tools and a desire to delve a bit deeper. Double slashes won’t destroy your site, but ignoring them can send confusing signals that cost you over time. Fortunately, they’re easy to find and fix once you know what to look for, so check your setup, make the small changes, and move on with confidence. Here’s to clean URLs, better search performance, and one less mystery in your crawl report.
