Crawling SEO
Crawling is the process search engine bots use to discover and fetch web pages so they can be analyzed for indexing.
Key takeaways
- Crawling is the discovery phase—without it, your pages won't be indexed or ranked.
- Bots find pages via internal links and sitemaps; orphan pages are invisible.
- Crawling and indexing are separate; a crawled page may not be indexed.
- Common blockers: robots.txt, noindex, server errors, slow load times.
- Use Google Search Console to monitor crawl activity and fix errors.
If a page is not crawlable, search engines may never discover it, which limits its chance to be indexed and ranked.
Example: How Googlebot Crawls a Blog Post
- Googlebot starts from a known URL (e.g., your homepage).
- It follows an internal link to a new blog post.
- The bot fetches the page's HTML, images, and other resources.
- It then follows links from that blog post to discover more pages.
- All discovered URLs are added to a queue for further crawling.
When Should You Focus on Crawling?
- When launching a new website or adding new pages.
- If your pages are not appearing in search results.
- After making major site structure changes (e.g., redesign, URL changes).
- When you notice a drop in organic traffic or indexed pages.
- To ensure important content is discovered quickly (e.g., time-sensitive offers).
What Crawling Is Not
- Crawling is not indexing—a page can be crawled but not stored in the search index.
- Crawling is not ranking—even if indexed, a page may rank poorly or not at all.
- Crawling is not a one-time event—bots revisit pages to check for updates.
- Crawling is not guaranteed—blockers like robots.txt or server errors can prevent it.
Quick Start: Improve Crawlability in 5 Steps
- Submit an XML sitemap to Google Search Console.
- Ensure all important pages are linked internally (no orphan pages).
- Check robots.txt for accidental blocks (e.g., disallowing CSS/JS).
- Monitor Crawl Stats in Google Search Console for errors.
- Fix server errors (5xx) and slow page loads to keep bots happy.
Common Crawling Mistakes
- Treating crawling and indexing as the same thing.
- Blocking important pages or resources with robots.txt, noindex, or poor site architecture.
- Relying on orphan pages that are not reachable through internal links.
- Ignoring crawl errors, slow responses, or server instability that can reduce crawl efficiency.
Next step
FAQ
What is crawling in SEO?
Crawling is the process where search engine bots (like Googlebot) discover and fetch web pages by following links and reading sitemaps. It is the first step before indexing and ranking.
Is crawling the same as indexing?
No. Crawling is discovery and fetching; indexing is storing and organizing page content in a database. A page can be crawled but not indexed.
How do I check if Google is crawling my site?
Use Google Search Console's Crawl Stats report or inspect a URL to see if it was crawled. Server logs also show bot activity.
Related topics
Sources
- Google Search Central: Crawling and indexing overview — Explains how Google discovers, crawls, indexes, and serves content.
- Moz Beginner's Guide to SEO — Clear industry-standard explanation of crawling versus indexing and ranking.
- Google Search Central: Learn about sitemaps — Useful for explaining how sitemaps support discovery.
Reviewed by Lucía Marín, Founding editor.