Compare raw HTML vs rendered HTML
See what the server sends first, what JavaScript adds, and whether crawlers may be missing important page content.
All free toolsCheck what exists before JavaScript runs
The result highlights how much readable content exists before JavaScript compared with the rendered page.
Bare domains use HTTPS and the www hostname by default.
Move through the diagnostic sequence.
See what crawler-style requests can read.
Compare the first HTML response with rendered content.
Score crawler access, metadata, and thin-content issues.
Check crawler rules and AI-agent discovery files.
Check up to 10 sitemap or pasted URLs.
When to use this tool
Your app ships a small root div and JavaScript bundle before real content appears.
You need to show why a finished browser preview does not prove crawler readability.
Use the gap to decide whether rendered HTML for bots would solve the problem.
Does JavaScript contain most of the page?
A large gap means the browser can see useful content that is absent from the first response. Review the missing headings, copy, links, and metadata—not only the text ratio.
It does not promise rankings, traffic, or AI citations. It tells you whether bots are getting useful HTML from the request path.
The rendered page contains substantially more useful content than the raw response. Crawlers that do not execute JavaScript reliably may receive an incomplete page.
The raw response already contains the page's important content and signals. A separate rendering layer may not be necessary for this URL.
Very low readable text, generic metadata, missing headings, blocked crawler access, or a large raw-versus-rendered gap.
If the rendered page has much more content
Confirm the same gap on important routes, then choose SSR, static generation, or crawler rendering. If raw HTML is already complete, leave the delivery path alone.