WhatsApp link preview debugger: the only tool that simulates WhatsApp

When you select a crawler and enter a URL, we send a server-side HTTP request using that bot's exact User-Agent string. For example, selecting Googlebot sends the request with 'Mozilla/5.0 (compatible; Googlebot/2.1)' - the same identifier Google's real crawler uses.

Your web server receives this request and responds based on the User-Agent. If you have dynamic rendering, cloaking rules, or bot-specific logic configured, the response will reflect that. This is exactly what happens during a real crawl - we are replicating the full request/response cycle.

The returned HTML is then analysed for SEO elements: title tag, meta description, Open Graph tags, heading structure, canonical URL, structured data, and overall text content. Each element is scored, and the tool flags missing or problematic items with severity ratings.

When you select multiple crawlers, each one makes an independent request in parallel. The results are displayed side by side in a comparison table so you can spot differences - for example, a page that returns complete HTML for Googlebot but an empty shell for GPTBot.

WhatsApp is the world's most popular messaging platform with over 2 billion users. When someone shares a link in a WhatsApp chat, the app fetches the page to generate an inline preview showing a title, description, and thumbnail image. These previews are critical for click-through rates in private and group chats.

WhatsApp's link preview system does not execute JavaScript. It reads Open Graph meta tags (og:title, og:description, og:image) from the raw HTML response. If your JavaScript framework renders these tags client-side, WhatsApp displays the link as a plain URL with no preview - dramatically reducing the likelihood that recipients will click through.

WhatsApp link previews are particularly important for e-commerce, content marketing, and customer communication. When a customer service agent shares a product link, or when a user forwards an article to a group chat, a rich preview with an image and description provides context and builds trust. A bare URL looks unprofessional and suspicious.

Pre-rendering ensures WhatsApp's crawler receives your OG tags in the raw HTML, producing rich link previews that display correctly in every chat conversation.