Server HTML versus live DOM
Inspect the signal in the rendered page.
SEO tool · Free in Chrome
Rendered HTML Checker for JavaScript SEO
Search Toolbox helps you see exactly what changed between server response and browser render, directly on the live page. The goal is a concrete source-to-render diff you can hand to the development team, without hiding the evidence behind one overall score.
JavaScript SEOs and teams working with React, Next.js, Vue or client rendering
What you can verify
Changed titles and canonicals
Compare source code with the browser output.
Injected schema and links
Find contradictions that block indexation.
Missing content after hydration
Export evidence your team can act on.
The observable problem
A page can look complete to users while critical links or metadata are absent from the initial HTML.
The useful outcome
a concrete source-to-render diff you can hand to the development team
Evidence on the real page
rendered HTML checker
A verifiable workflow, not a decorative score
Open the real page
Check the rendered HTML checker in the real session, staging environment or localhost — preferably the troublesome page, not the perfectly groomed demo.
Inspect the evidence
Check server html versus live dom, changed titles and canonicals, injected schema and links, missing content after hydration and connect signals that contradict each other.
Fix and retest
Aim for a concrete source-to-render diff you can hand to the development team. Change one rule at a time, then repeat the exact same check so you know what actually moved.
What this page does not pretend to do
For the rendered HTML checker, Search Toolbox inspects the active URL deeply. It is not a full-site crawler, backlink platform or rank tracker. Test several URLs when the issue comes from a template.
Frequently asked questions
What does the rendered HTML checker check?
It covers server html versus live dom, changed titles and canonicals, injected schema and links, missing content after hydration to deliver a concrete source-to-render diff you can hand to the development team.
Is the rendered HTML checker free?
Manual checks for the rendered HTML checker are included in the 60+ free tools. Only the optional contextual SEO Expert uses credits.
Does it work on staging and localhost?
Yes. The rendered HTML checker check runs on the page you are viewing, including logged-in sessions and non-public environments.
Is it a full SEO crawler?
For the rendered HTML checker, Search Toolbox inspects the active URL deeply. It is not a full-site crawler, backlink platform or rank tracker. Test several URLs when the issue comes from a template.
Verify it on your own page.
Manual checks for the rendered HTML checker are included in the 60+ free tools. Only the optional contextual SEO Expert uses credits.