HTML Page Weight Analyzer

Paste any HTML document to analyze its total weight online for free. Our HTML page weight analyzer breaks down inline CSS, inline JavaScript, base64 images, inline SVGs, HTML comments, and whitespace — with GZIP and Brotli compression estimates and actionable optimization recommendations. All analysis happens in your browser. No signup required.

Paste any HTML document to analyze its total weight — broken down by inline CSS, inline JavaScript, base64 images, inline SVGs, comments, and whitespace. Shows GZIP and Brotli compression estimates and actionable optimization recommendations. All analysis happens locally in your browser.

Load sample:

HTML Input

1530 bytes

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Sample Page</title>
  <link rel="stylesheet" href="/styles/main.css">
  <link rel="stylesheet" href="/styles/components.css">
  <link rel="preload" href="/fonts/inter.woff2" as="font" crossorigin>
  <style>
    /* Inline critical CSS */
    body { margin: 0; font-family: Inter, sans-serif; }
    .hero { background: #009bf9; color: white; padding: 2rem; }
    .container { max-width: 1200px; margin: 0 auto; }
  </style>
</head>
<body>
  
  <nav class="nav">
    <a href="/">Home</a>
    <a href="/about">About</a>
    <a href="/contact">Contact</a>
  </nav>

<main class="container">
    <section class="hero">
      <h1>Welcome to Our Website</h1>
      <p>This is a sample page for the HTML Page Weight Analyzer.</p>
    </section>

<section class="content">
      <h2>Our Features</h2>
      <p>We offer a wide range of tools and services to help you build better websites.</p>
      <ul>
        <li>Fast performance</li>
        <li>SEO optimized</li>
        <li>Mobile friendly</li>
      </ul>
    </section>
  </main>

Why Use Our HTML Page Weight Analyzer?

Instant HTML Page Weight Analysis

Analyze HTML page weight instantly in your browser — no server upload, no cloud processing. Our html page weight analyzer breaks down inline CSS, inline JS, base64 images, SVGs, comments, and whitespace in real time.

Secure HTML Page Weight Analyzer Online

Your HTML source code never leaves your device when you analyze it. 100% client-side processing means complete privacy — no cloud storage, no server logs, no source code exposure.

HTML Page Weight Analyzer — No Installation

Analyze HTML page weight directly in your browser with no software downloads, no plugins, and no account required. Works on any modern browser on any operating system — no signup required.

GZIP & Brotli Compression Estimates

See estimated GZIP and Brotli compressed sizes alongside the raw HTML weight — with a visual size bar comparison. The analyzer also lists all external resources and their HTTP request count.

Common Use Cases for HTML Page Weight Analyzer

Core Web Vitals & LCP Optimization

Analyze HTML page weight to identify what's making your Largest Contentful Paint (LCP) slow. Large inline CSS, inline JS, and base64 images all increase HTML transfer size and delay first render.

PageSpeed Insights Score Improvement

Use the html page weight analyzer to find and fix the "Reduce initial server response time" and "Avoid large network payloads" PageSpeed warnings. The analyzer shows exactly which inline content is adding weight.

HTML Minification Planning

Identify how much whitespace and comment removal would save before running an HTML minifier. The analyzer shows the estimated savings from minification alongside GZIP and Brotli compression estimates.

Server-Side Rendering (SSR) Optimization

Analyze the HTML output of Next.js, Nuxt, or other SSR frameworks to identify bloated server-rendered payloads. Large inline JSON data blocks and hydration payloads are common SSR weight issues.

Email Template Weight Analysis

Analyze HTML email templates for weight issues — email clients have strict size limits (Gmail clips emails over 102 KB). The analyzer identifies inline CSS, base64 images, and other weight contributors.

E-Commerce Page Performance Audit

Analyze product page HTML to identify weight issues before they impact conversion rates. Large inline scripts, base64 product images, and excessive external resources are common e-commerce performance bottlenecks.

Understanding HTML Page Weight Analysis

What is HTML Page Weight?

HTML page weight is the total byte size of the HTML document transferred from the server to the browser. It includes the raw HTML structure, inline CSS (<style> tags), inline JavaScript (<script> tags withoutsrc), base64-encoded images, inline SVGs, HTML comments, and whitespace. Our html page weight analyzeruses the browser's native DOMParser APIto parse the HTML and measure each component's contribution to total weight — giving you a precise breakdown of where bytes are being spent.

How Our HTML Page Weight Analyzer Works

1Paste your HTML: Paste any HTML document — a full page, a component, or an email template. The byte counter updates in real time as you type. All analysis happens locally in your browser — your HTML source code never leaves your device.
2Click "Analyze Page Weight":The analyzer uses the browser's DOMParser to parse the HTML and extract inline CSS, inline JS, base64 images, SVGs, comments, and external resource references. It calculates the byte size of each component and estimates GZIP and Brotli compressed sizes.
3Review the breakdown and recommendations: The results show a weight summary with GZIP/Brotli estimates, a per-category breakdown with visual bars, a list of external resources, and actionable optimization recommendations with estimated savings.

What Gets Analyzed

Inline CSS: Content inside <style> tags — measured in bytes. Large inline CSS blocks should be extracted to external stylesheets for browser caching.
Inline JavaScript: Content inside <script> tags without a src attribute. Large inline scripts block rendering and should be extracted to external files.
Base64 Images: Images embedded as data: URIs — base64 encoding adds ~33% overhead vs binary. Use external image URLs for images larger than 1 KB.
HTML Comments & Whitespace: Comments and excess whitespace are stripped by HTML minifiers — the analyzer shows how much they contribute to total weight.

Important Limitations

The html page weight analyzer measures the HTML document weight only— it does not download or measure external resources (CSS files, JS bundles, images). GZIP and Brotli estimates are approximations based on typical text compression ratios — actual compression depends on content entropy. The analyzer uses the browser's DOMParser, which may normalize some HTML (e.g., adding missing closing tags) — paste the exact HTML as served by your server for accurate measurements.

Related Tools

JSON to YAML

Convert JSON to YAML format instantly - Free online JSON to YAML converter

XML to YAML

Convert XML to YAML format for configuration migration - Free online XML to YAML converter

CSV to YAML

Convert CSV spreadsheet data to YAML format - Free online CSV to YAML converter

TSV to YAML

Convert TSV tab-separated data to YAML format - Free online TSV to YAML converter

Frequently Asked Questions About HTML Page Weight Analyzer

An HTML page weight analyzer measures the byte size of an HTML document and breaks it down by component — inline CSS, inline JavaScript, base64 images, SVGs, comments, and whitespace. Our free html page weight analyzer online works entirely in your browser — your HTML source code is never uploaded to any server.

HTML is the first resource the browser downloads — it blocks rendering until fully received. Large HTML documents delay First Contentful Paint (FCP) and Largest Contentful Paint (LCP). Google recommends keeping HTML under 100 KB uncompressed. Large inline CSS and JS also block rendering and prevent browser caching.

Google recommends keeping HTML under 100 KB uncompressed for optimal Core Web Vitals. With GZIP compression, a 100 KB HTML document typically transfers as ~35 KB. Gmail clips HTML emails at 102 KB — emails larger than this show a "View entire message" link.

Absolutely. Our html page weight analyzer processes everything locally in your browser using the DOMParser API. Your HTML source code is never uploaded to any server, never stored, and never leaves your device.

Yes — 100% free, forever. No signup, no account, no premium tier, no file size limits, and no ads interrupting your workflow.

Inline CSS and JavaScript cannot be cached by the browser — they are re-downloaded on every page load. External CSS and JS files are cached after the first visit, reducing subsequent page load times to near-zero for those resources. Inline scripts also block HTML parsing and delay rendering.

Base64 encoding adds approximately 33% overhead to binary data — a 10 KB image becomes ~13.3 KB when base64-encoded. Base64 images also cannot be cached separately from the HTML document. Use external image URLs for images larger than 1 KB; base64 is only appropriate for very small icons (under 1 KB).

The estimates use typical compression ratios for HTML content (GZIP ~65% reduction, Brotli ~72% reduction). Actual compression depends on content entropy and repetition — highly repetitive HTML (like server-rendered lists) compresses better than the estimates.

No — the html page weight analyzer measures the HTML document weight only. It lists external resource URLs and counts HTTP requests, but does not download or measure external file sizes. Use browser DevTools Network tab to measure total page weight including all external resources.