Free comparer
Compare raw HTML vs rendered HTML
See what the server sends first, what JavaScript adds, and whether crawlers may be missing important page content.
Check 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.
Thin initial HTML
Your app ships a small root div and JavaScript bundle before real content appears.
Browser proof is not enough
You need to show why a finished browser preview does not prove crawler readability.
Prerendering fit
Use the gap to decide whether rendered HTML for bots would solve the problem.
How to use the result
- Initial raw HTML text length
- Rendered page text length
- Crawler-readable content gap
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.
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.
Check content that loads only after an interaction ↗