How Google Crawls Websites: A Complete Guide to Google Crawling and Indexing

Google crawling is the process Google uses to discover and visit webpages across the internet. Before a webpage can appear in Google Search results, Google generally needs to discover the page, crawl it, understand its content, and potentially add it to its search index.

Understanding how Google crawls websites is important for website owners, bloggers, SEO professionals, and businesses that want their webpages to rank higher in search results.

What Is Google Crawling?

Google crawling is the process of using automated programs called Googlebot to discover and access webpages.

Googlebot follows links from one webpage to another and discovers new or updated content.

For example:

Website A → Link → Website B → Link → Website C

When Googlebot discovers Website B, it can follow links on that page and discover additional webpages.

Google Crawling vs. Indexing

These two terms are often confused.

Crawling: Google discovers and visits a webpage.

Indexing: Google analyzes the webpage and decides whether it should be stored in Google’s search index.

Ranking: When someone searches Google, Google selects and orders relevant indexed pages for the search results.

A simple process is:

Discovery → Crawling → Processing → Indexing → Ranking → Search Results

How Does Google Discover a Website?

Google can discover webpages in several ways.

1. Links From Other Websites

Googlebot can discover your website through links from other websites.

For example, if another website links to:

example.com/page

Google may follow that link and discover your webpage.

2. Internal Links

Internal links connect pages within your own website.

For example:

Homepage → Blog → SEO Guide → Google Crawling Guide

Good internal linking helps search engines discover important pages.

3. XML Sitemap

An XML sitemap provides Google with a list of important URLs on your website.

A typical sitemap can contain URLs such as:

• Homepage
• Blog posts
• Product pages
• Category pages
• Important service pages

Submitting a sitemap through Google Search Console can help Google discover URLs more efficiently.

4. Google Search Console

Website owners can use Google Search Console to monitor how Google discovers and indexes their website.

You can inspect individual URLs and see information related to crawling and indexing.

What Is Googlebot?

Googlebot is Google’s web crawler.

Google uses different Googlebot crawlers to access different types of content and devices.

For example, Google can crawl webpages using a mobile-oriented crawler because Google primarily uses the mobile version of a site’s content for indexing.

Googlebot downloads resources from webpages and processes the content so Google’s systems can understand the page.

How Google Crawls a Website

The crawling process can be simplified into several steps.

Step 1: Google Discovers a URL

Google finds a URL through links, sitemaps, previously known URLs, or other discovery methods.

Step 2: Google Checks Crawling Restrictions

Before crawling a URL, Google checks whether the site has restrictions such as a robots.txt file.

For example:

User-agent: *
Disallow: /private/

This tells compliant crawlers not to crawl URLs under /private/.

Step 3: Googlebot Requests the Page

Googlebot sends a request to the website’s server.

The server returns the webpage and associated resources.

Step 4: Google Processes the Page

Google analyzes the page’s content, links, images, structured data, and other information.

Step 5: Google May Add the Page to Its Index

If Google determines that the page is suitable for indexing, it can be included in Google’s search index.

Step 6: Google Can Rank the Page

When a user performs a search, Google’s ranking systems determine which indexed pages are relevant to that query.

How Long Does Google Take to Crawl a Website?

There is no fixed time.

Google may discover and crawl some pages quickly, while other pages may take longer.

Crawling frequency can depend on factors such as:

• Website size
• Website popularity
• Number of internal links
• Server performance
• Content changes
• Sitemap availability
• Overall website structure
• Crawl demand
• Server capacity

A new website should therefore not expect every page to appear in Google immediately.

What Is Crawl Budget?

Crawl budget refers broadly to the amount of crawling Google can perform on a website during a particular period.

Large websites with thousands or millions of URLs need to pay particular attention to crawl efficiency.

Problems that can waste crawling resources include:

• Duplicate URLs
• Infinite URL parameters
• Poor internal linking
• Large numbers of low-value pages
• Server errors
• Redirect chains
• Soft 404 pages

For smaller websites, crawl budget is usually less of a concern than basic technical SEO and making important pages easily discoverable.

How Robots.txt Affects Crawling

The robots.txt file is located at the root of a website.

Example:

https://example.com/robots.txt

A robots.txt file can provide crawling instructions to search engine crawlers.

Example:

User-agent: *
Disallow: /admin/
Disallow: /private/
Allow: /

Be careful when using robots.txt.

Blocking crawling does not necessarily mean that a URL can never appear in search results. If Google discovers a blocked URL through other means, it may still know about the URL.

If your goal is to prevent a page from being indexed, using an appropriate noindex directive is generally different from simply blocking the page in robots.txt.

Why Internal Links Are Important

Internal links help Google discover pages on your website.

For example:

Homepage
↓
SEO Category
↓
Google Crawling Guide
↓
Google Indexing Guide

Use descriptive anchor text when appropriate.

Instead of:

Click here

You could use:

Learn how Google indexing works

This gives both users and search engines more context.

How Images Are Crawled by Google

Google can discover and process images found on webpages.

For better image SEO, use:

Descriptive Image File Names

Instead of:

IMG12345.jpg

Use:

how-google-crawls-websites.jpg

Use Alt Text

Example:

<img src="how-google-crawls-websites.jpg"
alt="Diagram showing how Google crawls and indexes a website">

Alt text helps describe the image and can improve accessibility.

Use Relevant Images

Images should be relevant to the content surrounding them.

Optimize Image Size

Large image files can negatively affect page loading performance.

Use appropriately sized images and modern formats where suitable.

Suggested Images for This Article

For an article about Google crawling, use original diagrams and relevant screenshots.

Image 1: Google Crawling Process

Suggested image:
A diagram showing:

Website → Googlebot → Crawl → Process → Index → Google Search

Suggested file name:

google-crawling-process.png

Suggested alt text:

Diagram showing how Google crawls, processes and indexes websites

Image 2: Googlebot Illustration

Suggested image:
An illustration of a search engine crawler discovering webpages through links.

File name:

googlebot-website-crawler.jpg

Alt text:

Googlebot crawling webpages through website links

Image 3: XML Sitemap

Suggested image:
A screenshot or diagram explaining how an XML sitemap lists website URLs.

File name:

xml-sitemap-google-crawling.jpg

Alt text:

XML sitemap helping Google discover website URLs

Image 4: Google Search Console

Suggested image:
A screenshot of the URL Inspection or indexing section in Google Search Console.

File name:

google-search-console-url-inspection.jpg

Alt text:

Google Search Console URL inspection showing website indexing information

How to Make Your Website Easier for Google to Crawl

Follow these SEO practices:

1. Create a Clear Website Structure

Organize your website into logical categories.

2. Use Internal Links

Connect related pages using relevant internal links.

3. Create an XML Sitemap

Keep your sitemap updated with important URLs.

4. Maintain a Clean Robots.txt

Don’t accidentally block important pages or resources.

5. Fix Broken Links

Regularly check your website for broken internal and external links.

6. Improve Server Performance

A slow or unreliable server can create crawling problems.

7. Avoid Duplicate Content

Use canonical URLs and good site architecture where appropriate.

8. Keep Important Content Accessible

Make sure important content isn’t hidden behind unnecessary technical barriers.

9. Use Google Search Console

Monitor crawling, indexing, and search performance.

10. Publish Useful Content

Creating genuinely useful content gives Google a reason to discover and potentially rank your pages.

Common Reasons Google May Not Crawl a Page

There are several possible reasons.

The Page Has No Internal Links

If there are no links pointing to a page, discovering it may be harder.

Robots.txt Blocks Crawling

Your robots.txt configuration may prevent Googlebot from crawling the URL.

Server Errors

Errors such as HTTP 5xx responses can prevent successful crawling.

Poor Website Architecture

A complicated structure can make important pages harder to discover.

Too Many Low-Value URLs

Large websites can generate huge numbers of URLs through filters, parameters, and duplicate pages.

The Page Is Very New

Google may simply not have discovered or crawled it yet.

How to Check Whether Google Has Crawled Your Page

The easiest method is Google Search Console.

Use the URL Inspection feature and enter your webpage URL.

You can check information related to:

• URL indexing
• Crawling
• Sitemap discovery
• Canonical URL
• Mobile usability
• Page indexing
• Search appearance

You can also search Google using:

site:example.com

For example:

site:example.com/how-google-crawls-websites

However, a site: search should not be treated as a complete diagnostic tool. Search Console provides much more useful information about your own website.

Google Crawling, Indexing and Ranking: What’s the Difference?

Understanding this difference is essential for SEO.

A page can be crawled but not indexed.

A page can also be indexed but receive very little traffic because it does not rank highly for relevant searches.

Frequently Asked Questions

Does Google crawl every website?

Google can discover and crawl many websites, but crawling is not guaranteed for every URL or at a specific frequency.

How often does Google crawl a website?

There is no universal schedule. Crawling frequency varies depending on the website and Google’s systems.

Does submitting a sitemap guarantee indexing?

No. A sitemap helps Google discover URLs, but it does not guarantee that every URL will be indexed.

Does Google crawl images?

Yes. Google can discover and process images associated with webpages.

Does robots.txt stop Google from indexing a page?

Robots.txt primarily controls crawling. It should not be confused with a noindex directive.

How can I ask Google to crawl a new page?

Google Search Console’s URL Inspection tool can be used to request indexing for a URL, although a request does not guarantee immediate crawling or indexing.

Conclusion

Google crawling is the first important step in the journey from a webpage to Google Search.

A strong website should have a logical structure, useful internal links, an accessible XML sitemap, appropriate robots.txt instructions, fast and reliable hosting, optimized images, and high-quality content.

Remember the basic SEO process:

Discover → Crawl → Process → Index → Rank → Search

If Google can easily discover and understand your website, your pages have a better foundation for appearing in relevant Google Search results.