What this tool does
Page Size Checker estimates pasted HTML byte size, asset tag counts, likely third-party references, and performance-budget warnings.
← All ToolsPasted HTML mode. For honest browser-local privacy, this tool measures the text you paste and counts referenced assets; it does not request the URL or download linked files.
📦 Page Size Checker
Estimate static HTML weight and asset references from pasted markup. This page does not fetch external resources.
Why it is useful
It helps developers spot heavy templates, excessive scripts, too many images, and inline payload bloat before deeper lab testing.
How it works
The browser parses pasted HTML, counts resource references, and estimates text payload size.
Best input
Paste generated production HTML or a realistic resource list.
Performance tip
Look for oversized inline data, unused scripts, excessive fonts, and third-party tags first.
Privacy note
Calculations run locally. This tool does not fetch URLs or linked resources.
Important limitation
This estimates markup size and references, not real compressed transfer weight or runtime performance.
Quick answers
Does this fetch my page?
No. It only analyzes pasted text.
Will this match Lighthouse?
No. Lighthouse also measures network transfer, compression, rendering, and runtime behavior.
Common Use Cases
Estimate static HTML weight
Paste generated HTML to see byte size and asset tag counts.
Document performance QA
Copy a simple page-size summary into deployment notes.
SEO Suite workflow
Move from pasted page metadata into canonical, heading, link, keyword, page-size, Core Web Vitals, SERP snippet, social-card, and meta-description checks while keeping local-analysis boundaries clear.