Why is submitting a sitemap essential for the crawling of your site?

Is the sitemap still a real lever or just a formality?

Many SEO professionals see the sitemap as an administrative checkbox: generate it once, submit it, and move on. Mistake. Google emphasizes here that submitting a sitemap actively helps engines discover all content — an important nuance. This means that even with impeccable internal linking, some content may escape crawling, particularly deep pages, new publications, or media assets.

Daniel Waisberg points out three types of resources explicitly: pages, images, videos. Images and videos often fly under the radar of poorly configured sitemaps, even though they represent a significant amount of traffic in certain sectors. A well-structured multimedia sitemap boosts visibility in Google Images and Google Videos — two underutilized traffic sources.

What does “facilitate discovery” really mean?

Google never guarantees the indexing of a URL present in the sitemap. However, it confirms that the sitemap accelerates discovery and increases the chances that a page will be crawled quickly. On a site that publishes daily — e-commerce, media, active blog — the sitemap becomes a near real-time notification channel.

The Sitemaps report in Search Console also offers valuable visibility on submitted vs indexed URLs. A significant gap between the two metrics often reveals structural issues: duplicate content, messy canonicalization, pages blocked by robots.txt, or simply content deemed irrelevant by Google. This report serves as a diagnostic tool, not just a submission tool.

Which types of sites benefit the most?

Sites with a deep architecture — e-commerce with thousands of product listings, news portals, multi-category sites — benefit the most from a well-maintained sitemap. Conversely, a showcase site with 10 pages and a coherent internal link structure will only see marginal benefits.

Sites that regularly launch new content should update their sitemap in near real-time. A modern CMS does this automatically, but some custom or legacy setups require manual monitoring. An outdated sitemap listing 404s or redirects sends a signal of negligence to Google.

• The sitemap does not guarantee indexing, but it accelerates discovery and increases the likelihood of crawling.
• Three formats to include: classic HTML pages, images (with dedicated tags), videos (with metadata).
• The Search Console report helps diagnose discrepancies between submission and indexing — a goldmine for spotting issues.
• Complex architecture sites or frequently updated sites: the sitemap is critical, not optional.
• A dirty sitemap (404s, redirects, blocked pages) can harm the perceived quality of the site by Google.

Is this statement consistent with practices observed in the field?

Yes, without reservation. SEO audits regularly show that sites neglect their sitemaps or generate them poorly — duplicate URLs, tracking parameters, unmanaged language variants. The result: Google crawls unnecessary URLs and misses strategic content. Crawl logs confirm that Google frequently checks the sitemap, especially on active sites.

Where it gets tricky: some CMS or plugins generate sitemaps automatically, but without business logic. They include empty taxonomies, time archives without added value, or nearly identical author pages. An overcrowded sitemap dilutes crawl budget instead of optimizing it. The idea that “the more URLs in the sitemap, the better” is a rookie mistake.

What nuances should be added to this official recommendation?

Google says “submit a sitemap,” but it doesn’t specify how to structure it intelligently. A large site with 500,000 pages shouldn’t submit a single 50 MB sitemap — it should be broken down into specialized sitemaps: one for products, one for the blog, one for images, and one index sitemap that federates them. This organization allows for fine monitoring of indexing rates by content type.

Another point: the <lastmod> (last modified date) is often ignored or poorly filled out. If Google sees that all URLs have the same lastmod or that it never changes, it quickly understands that the information is bogus and disregards it. It’s better not to provide this tag than to fill it with fanciful data.

[To be verified] Google claims that the sitemap “helps discover” content, but never specifies what proportion of the crawl actually comes from the sitemap vs from internal linking. Logs show that on a well-linked site, the majority of the crawl still comes from link following. The sitemap primarily serves as a safety net and accelerator for new content.

In what cases does this rule not apply?

An ultra-simple site — 5 to 20 pages, clear internal linking, infrequent publishing — does not need a sitemap to be crawled effectively. Google will find everything via internal links after a few passes. The sitemap then becomes a formality that adds no measurable value.

Conversely, some complex sites — marketplaces, UGC content aggregators, sites with millions of pages — cannot include everything in the sitemap without making it unusable. It's then necessary to prioritize strategic URLs: active product listings, recent articles, high-potential landing pages. A sitemap listing 10 million URLs where 80% are SEO noise is useless.

What should be done concretely to optimize the sitemap?

First, audit the existing sitemap. Download it, scrutinize the URLs: how many 404s? How many redirects? How many pages blocked by robots.txt or canonicalized elsewhere? A good sitemap contains only URLs with a 200 status, indexable, without canonical pointing to another page. Everything else pollutes the signal.

Next, segment by content type. An e-commerce site should have a products sitemap, a categories sitemap, a blog sitemap, and a product images sitemap. This granularity allows for monitoring indexing rates by segment in Search Console and identifying where the blocks are — for example, if product listings index well but the blog stagnates, this reveals a quality or duplication issue on the editorial side.

What mistakes should be absolutely avoided?

Never include paged URLs (page=2, page=3…) in the sitemap if they are canonicalized to page 1 or blocked by noindex. Google will crawl them, see that they are not indexable, and you will have wasted crawl budget for nothing. The same logic applies to filter variants (color, size, price) on an e-commerce site — unless you have an explicit SEO strategy for those combinations.

Another classic mistake: forgetting to update the sitemap after a redesign or migration. Dead URLs lingering for months in the sitemap send a signal of poor site maintenance. Set up a Search Console alert to be notified of sitemap errors as soon as they appear.

How to check if my sitemap is working correctly?

In Search Console, under the Sitemaps section, look at the ratio of submitted URLs to indexed URLs. An indexing rate lower than 60-70% on a healthy site should raise alarms. Investigate non-indexed URLs using the URL Inspection tool: Google will tell you why it is not indexing them — duplication, low quality, crawl refusal, canonical, noindex.

Also check that the sitemap is publicly accessible (test the URL in incognito mode) and that it is declared in robots.txt via the Sitemap: directive. Even if you submit it in Search Console, declaring it in robots.txt allows other bots (Bing, Yandex) to find it automatically.

• Audit the current sitemap: zero 404s, zero redirects, zero blocked or canonicalized pages elsewhere.
• Segment by content type (products, blog, images, videos) for fine monitoring.
• Exclude paged, filtered, or non-strategic URLs — quality > quantity.
• Automate the sitemap update with each publication or modification (via CMS or custom script).
• Monitor the Search Console report weekly to detect discrepancies between submission/indexing.
• Declare the sitemap in robots.txt in addition to the Search Console submission.