OpenWebmasterby Mello Zone

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Language, color, reading size, and motion stay on this device.

Inspect URLAdd website

JavaScript SEO · response source · rendered DOM

Compare response HTML with rendered HTML

Paste the raw server response beside a rendered DOM snapshot to find JavaScript-created or modified titles, descriptions, canonicals, robots directives, headings, internal links, external links, visible text, image alt coverage, and JSON-LD.

HTML INPUT200,000 CHARSSEO ELEMENTSSIDE BY SIDERENDERERNOT CLAIMED
PAGE CONTEXT

Set the URL used for link classification

The URL is used only to resolve relative links and separate same-origin links from external links. The tool does not fetch this page.

HTML SNAPSHOTS

Paste both versions of the page

Use View Source or the HTTP response for the first field. Use your browser inspector, crawler export, or rendering workflow for the rendered DOM field.

Boundary: this compares the two supplied HTML snapshots. It does not run Chromium, inspect a live network waterfall, or prove what a search crawler indexed.

Evidence boundary: OpenWebmaster compares supplied response HTML and supplied rendered DOM HTML. It does not run a browser renderer, prove Googlebot or another crawler rendered the page, measure crawl budget, verify indexing, score JavaScript SEO, estimate rankings, traffic, conversions, or infer cause.

JS

Ready for both HTML snapshots.

No sample JavaScript score, Googlebot rendering proof, indexing claim, ranking impact, traffic claim, or manufactured crawl-budget metric appears before you supply both snapshots.

METHOD

Useful JavaScript SEO comparison without pretending to crawl the web

Critical fields first

Titles, meta descriptions, canonicals, robots directives, H1 text, links, visible words, images, and JSON-LD are compared because changes there can alter crawl discovery, indexability interpretation, or search appearance review.

Differences are not automatically defects

Some JavaScript frameworks intentionally create page content after rendering. The report marks what changed so you can decide whether that behavior is expected.

Live rendering stays separate

For a live page, pair this with a crawler, browser export, or future rendering workflow. OpenWebmaster keeps supplied snapshots separate from Googlebot, Bingbot, or LLM crawler behavior.