What Is IndexNow? Definition and How It Works

IndexNow is an open-source protocol that allows websites to instantly notify participating search engines whenever content is created, updated, or deleted. Instead of waiting hours or days for crawlers to discover changes on their own, IndexNow sends a real-time signal that triggers immediate indexing. It is supported by Bing, Yandex, Naver, and other engines, making it a key tool for getting content into AI-powered search systems like Microsoft Copilot faster.

Why It Matters

Traditional search engine indexing is a passive process. Crawlers visit your site on their own schedule -- sometimes within hours, sometimes not for weeks. For time-sensitive content like product launches, news, or updated pricing, that delay can mean lost visibility during the most critical window.

IndexNow flips this model. Instead of waiting for search engines to find your changes, you tell them directly. The search engine receives your notification and indexes the updated page within minutes, not days.

For AI SEO, this speed advantage is significant. Microsoft Copilot draws its answers from Bing's index. ChatGPT also uses Bing for web browsing. When your content is indexed faster in Bing, it becomes available to these AI systems sooner. In a landscape where being first to answer a question can determine whether AI cites you or a competitor, IndexNow provides a measurable edge.

The protocol also reduces unnecessary crawling. Search engines no longer need to repeatedly crawl your site looking for changes -- they only fetch pages you flag as updated. This conserves crawl budget and server resources, which is especially valuable for large sites with thousands of pages.

For a broader view of technical optimizations that affect AI visibility, see our technical SEO overview.

How It Works

IndexNow operates through a straightforward API mechanism with three components.

Step 1: Generate an API key. You create a unique key through the IndexNow website or your search engine's webmaster tools (such as Bing Webmaster Tools). This key verifies that the indexing requests genuinely come from your site.

Step 2: Host the key file. Place a text file containing your API key at the root of your domain (e.g., https://example.com/your-api-key.txt). This serves as verification that you own the site.

Step 3: Send notifications. Whenever you publish, update, or delete a page, your site sends an HTTP POST request to the IndexNow endpoint with the URL(s) that changed. You can submit a single URL or batch up to 10,000 URLs per request.

Example API call:

POST https://api.indexnow.org/IndexNow
{
  "host": "example.com",
  "key": "your-api-key",
  "urlList": [
    "https://example.com/new-blog-post",
    "https://example.com/updated-product-page"
  ]
}

Most CMS platforms simplify this further. WordPress has dedicated IndexNow plugins that automatically ping the API whenever you publish or update a post. Shopify, Wix, and Cloudflare also offer native or plugin-based IndexNow support.

One important detail: IndexNow operates on a shared-submission model. When you notify one participating search engine, that engine shares the notification with all other IndexNow partners. So a single ping to Bing also reaches Yandex, Naver, and Seznam.

Practical Implications

• Faster AI visibility. Content indexed in Bing within minutes becomes available to Copilot and ChatGPT's browsing mode almost immediately. This is critical for competitive queries where multiple sources publish similar content.
• Complements your sitemap. IndexNow does not replace XML sitemaps. Sitemaps tell search engines about all your pages; IndexNow tells them which pages changed right now. Use both together for complete coverage.
• No impact on Google directly. Since Google has not adopted IndexNow, you still need Google's own indexing tools (Search Console URL Inspection) for Google-specific indexing. However, the Bing-side benefits still affect AI platforms that use Bing.
• Works best for frequently updated sites. If your site publishes new content daily or updates product pages regularly, IndexNow delivers the highest value. Static sites that rarely change see less benefit.
• Monitor adoption in Bing Webmaster Tools. After implementing IndexNow, you can verify that your submissions are being processed in the IndexNow section of Bing Webmaster Tools. Check whether your AI visibility improves in Copilot after implementation -- see our guide on checking visibility in Copilot.