Should you really maintain an HTML sitemap alongside the XML one?

Why does Google differentiate between XML and HTML sitemaps?

The XML sitemap is a standardized protocol readable by machines, specifically designed to communicate with crawlers. It contains structured metadata (URLs, priorities, frequency of updates, last modified dates) that Googlebot can parse quickly.

The HTML sitemap, on the other hand, is primarily for humans. It is a standard web page that lists the main sections and pages of the site in a navigable hierarchy. Googlebot can crawl it just like any other page, thus discovering URLs that it might not have reached through conventional internal linking.

Is this recommendation outdated?

The joint initiative between Google, Yahoo, and Microsoft dates back to the early days of the XML sitemap protocol. At that time, crawling capabilities were more limited, and HTML sitemaps played a crucial role in discoverability.

Today, Googlebot is infinitely more efficient. It crawls massive sites with no major difficulties. Yet, Google maintains this dual recommendation. This indicates that even with sophisticated crawling algorithms, providing multiple entry points remains beneficial, especially for sites with complex architectures or imperfect internal linking.

What’s the practical difference between the two formats?

The XML sitemap serves as a technical catalog: it exposes raw URLs along with their metadata, allowing Googlebot to adjust its crawling priorities. It can contain up to 50,000 URLs per file and supports multiple types of content (pages, images, videos, news).

The HTML sitemap, however, functions more like an alternative navigation blueprint. It enhances accessibility for users who may be lost and offers a safety net for poorly linked pages within the hierarchy. Additionally, it transmits internal PageRank to the listed pages, which the XML sitemap does not do.

• The XML sitemap provides technical metadata usable by crawlers (priority, frequency, lastmod)
• The HTML sitemap creates crawlable links transmitting PageRank and enhances UX
• Both formats complement each other without substituting: XML optimizes crawling, while HTML secures discovery
• A well-architected site can technically do without the HTML sitemap, but rarely without the XML one
• Google explicitly recommends both as each format addresses a different need in its crawling process

Does this recommendation still hold relevance in a modern context?

Let’s be honest: the majority of professional sites completely neglect the HTML sitemap. They focus solely on the XML, and in most cases, this works perfectly fine. Google crawls and indexes their pages without apparent issues.

However, this observation does not render the recommendation obsolete. On sites with millions of pages, a deficient internal linking, or dynamically created orphan pages, the HTML sitemap can serve as a safety net. The problem is that no one truly measures its isolated impact. [To be verified]: Google provides no quantified data on crawl budget improvement when both sitemaps coexist.

Why do so few sites maintain an HTML sitemap?

The main reason is simple: it’s an additional maintenance burden. Automatically generating an XML sitemap is trivial with any CMS. Creating a readable, well-structured, and up-to-date HTML sitemap requires design and integration effort.

Many SEO professionals believe that if the site architecture is solid—with good internal linking and reasonable click depth—the HTML sitemap only offers marginal benefits. And they’re not entirely wrong. The perceived ROI is low, especially compared to other technical optimizations.

When does the HTML sitemap become truly useful?

In practical terms, the HTML sitemap shows its value on large catalog e-commerce sites, media portals with deep archives, or platforms generating user-generated content where certain pages may temporarily become orphaned.

It also serves new or penalized sites where Googlebot allocates a reduced crawl budget. In this context, multiplying entry points can speed up discovery. But be careful: a poorly designed HTML sitemap with hundreds of random links can degrade UX and dilute internal PageRank. It’s better to have no HTML sitemap than a bad one.

What should you actually do with your sitemaps?

The top priority remains the XML sitemap. Ensure it is complete, up-to-date, free of errors (HTTP 404 codes, redirects), and submitted via Search Console. This is the bare minimum, non-negotiable.

For the HTML sitemap, assess the cost-benefit ratio based on your context. If your site has fewer than 10,000 pages, a clean internal linking structure, and a good indexing rate, don’t waste time on an HTML sitemap. Instead, invest in improving your overall architecture.

How can you check the effectiveness of your current sitemaps?

In Search Console, go to Sitemaps and check the coverage rate: how many submitted URLs are actually indexed? If you have a significant gap (over 20%), investigate the reasons: blocked pages, duplicate content, insufficient quality.

Use indexing coverage reports to identify URLs that are discovered but not indexed. If many come from poorly linked deep pages, this is a signal that your internal linking needs attention, and an HTML sitemap could temporarily compensate for the problem until a structural overhaul.

What critical mistakes must be absolutely avoided?

Never overload your XML sitemap with unnecessary URLs: indexable pagination pages, sort parameters, multiple filters. Each URL in the sitemap must be canonical and indexable.

For the HTML sitemap, avoid flat structures with 500 links on a single page. Organize by logical categories, prioritize, and think UX before crawlability. An HTML sitemap must remain usable by a human; otherwise, it loses its purpose.

• Ensure the XML sitemap is submitted and error-free in Search Console
• Exclude from the XML sitemap any page set to noindex, blocked by robots.txt, or redirected
• Test the XML's validity with a sitemap.org schema validator
• If you create an HTML sitemap, structure it by logical categories, not as a flat list
• Add a link to the HTML sitemap in the site's footer so it gets crawled regularly
• Monitor the indexing rate of URLs submitted via sitemaps to identify structural issues