Advanced Source Code Viewer

Extract HTML, CSS, JavaScript, Images, Links & Meta Data from any public webpage — all in one powerful free tool.

🏷 HTML 🎨 CSS ⚙ JavaScript 📷 Images 🔗 Links 📊 Meta Stats
⚠ Please enter a valid URL starting with http:// or https://
📦 Choose what to extract

⚡ Advanced Features

Everything you need to inspect, audit, and download any webpage's assets in one tool.

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Full HTML Extraction

Get the complete raw HTML with syntax highlighting, line numbers, find-in-source search, and one-click download as .html or .txt.

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CSS Extraction

Capture all inline <style> blocks and list every external stylesheet URL. Download as a single merged .css file or copy to clipboard.

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JavaScript Extraction

Extract all inline <script> blocks and enumerate every external .js file URL, with per-URL copy buttons for quick reference.

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Image Gallery

Visual thumbnail gallery of every image on the page including srcset sources. View alt text, dimensions, and export all URLs as a .txt list.

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Link Extractor

Full hyperlink inventory with anchor text, internal/external classification, and one-click CSV export for link auditing and SEO analysis.

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Meta & Page Stats

Instant snapshot of page title, description, Open Graph tags, word count, HTML tag count, page size, image count, and script totals.

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Syntax Highlighting

Toggle-able color-coded HTML with tag, attribute, and value highlighting in a dark editor theme — comfortable for large source files.

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Dark / Light Mode

Full dark mode for comfortable late-night sessions. Theme preference is saved locally so it persists across visits.

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Fully Responsive

Works perfectly on mobile, tablet, and desktop. Extract source from any device — no browser extensions or software required.

🔧 How It Works

Three steps to extract any webpage's full asset inventory — no browser extensions or login needed.

1
Paste the URL — enter any publicly accessible https:// address in the input field above.
2
Choose what to extract — tick the asset types you need: HTML, CSS, JS, Images, Links, or Meta Stats. All are enabled by default.
3
Click Extract and explore — switch between tabs to view each asset type, search within code, preview images, and download files individually.

Why Use an Advanced Source Code Viewer?

Modern webpages are complex: a single URL can pull in dozens of stylesheets, JavaScript bundles, third-party fonts, tracking scripts, and hundreds of images. Viewing raw source in a browser only shows you the HTML — it doesn't help you audit every CSS file, count image alt attributes, or export all outbound links for an SEO analysis.

SEOWebChecker's Advanced Source Code Viewer solves this by fetching the URL server-side (bypassing CORS restrictions) and parsing the full response into six structured views. You can instantly spot missing meta descriptions, unminified CSS, render-blocking scripts, images without alt text, or broken internal links — all without installing a single browser extension.

Use Cases for Developers and SEOs

  • Technical SEO audits: Check canonical tags, robots directives, hreflang attributes, Open Graph tags, and JSON-LD structured data in seconds.
  • Competitor research: Inspect which CSS frameworks, JS libraries, analytics platforms, and tracking scripts a competitor uses.
  • Link building: Export all outbound links from a resource page to identify link prospects and broken-link opportunities.
  • Image audits: Identify missing alt attributes or oversized images that could be harming Core Web Vitals scores.
  • Archiving and backup: Download the HTML, CSS, and JS of a page before a major redesign or migration.
  • Learning and education: Study how leading websites structure their code, implement responsive images, or use schema markup.

Syntax Highlighting and Code Navigation

The HTML panel features toggleable syntax highlighting that colour-codes tags, attributes, and values — making large source files readable at a glance. Use the built-in Find tool to search across thousands of lines instantly. Toggle line numbers and word-wrap to match your reading preference. All results are available for download in multiple formats (.html, .txt, .css, .js, .csv) directly from the browser — no server-side file generation required.

❓ Frequently Asked Questions

Everything you need to know about our advanced source code extraction tool.

Can I extract JavaScript-rendered content? ▾
Our tool fetches the raw HTML response from the server — identical to what a browser receives before any client-side JavaScript executes. Dynamic content injected by JS frameworks after page load won't appear, but all inline scripts and initial server-rendered HTML are fully captured.
Can I download CSS and JS as separate files? ▾
Yes. Switch to the CSS or JS tab after extraction, then click "Download Inline CSS" or "Download Inline JS" to save all inline blocks as a single merged file. External file URLs are listed individually with a copy button for each one.
Does the Image Extractor download the actual images? ▾
The tool displays a thumbnail gallery loaded directly from the source website. No images are stored on or routed through our servers. You can download the complete list of image URLs as a .txt file for batch downloading with your preferred tool.
Is there a page size limit? ▾
We support pages up to approximately 5 MB. Most production webpages are well under this limit. Very large single-page applications may approach it, but raw HTML alone is rarely that heavy.
Do you store extracted code or submitted URLs? ▾
No. All fetching and parsing is real-time and results are discarded immediately after your request. We do not log, cache, or store any source code, submitted URLs, or extracted assets.
Why are some external CSS or JS files missing from the lists? ▾
Some resources are loaded conditionally by JavaScript or injected dynamically after the initial HTML response. Since our tool captures the initial HTML only, those conditionally loaded files may not appear in the external URL lists.

🚀 Supercharge Your SEO Workflow

Pair the Source Code Viewer with our other free developer and SEO tools to audit, analyse, and optimise any website.