HTML Size Checker is a free WordPress plugin that adds a rendered HTML size column directly to your Posts and Pages list. It measures the exact file size Googlebot sees when it crawls your pages — including theme markup, schema, and page builder output — and displays it color-coded for instant review. Google’s Googlebot has a 2MB HTML size limit. Content beyond that gets silently truncated with no warning in Search Console. This plugin shows you where every post stands.
Built by AI Advantage Agency and offered free to the WordPress community.
What HTML Size Checker Does
The plugin adds a sortable HTML Size column to your WordPress Posts and Pages list. Every published post gets measured and displayed in KB or MB, color-coded so you can see at a glance which posts are safe and which need attention.
| Indicator | What It Means |
|---|---|
| 🟢 Green — under 500KB | You’re well within Google’s crawl limit. No action needed. |
| 🟡 Yellow — 500KB to 1MB | Getting larger. Keep an eye on it as you add content. |
| 🔴 Red — over 1MB | Review recommended. You still have headroom before the 2MB limit but it’s worth investigating what’s inflating the page. |
💡 Pro Tip: Most WordPress sites are well under 500KB per page. The median HTML page across the web is around 33KB. If your posts are showing green across the board, your site is in excellent shape for Googlebot crawling.
Why Googlebot’s 2MB Limit Matters for SEO
Google’s Googlebot crawls only the first 2MB of uncompressed HTML on any given page. Content beyond that cutoff — including schema markup, internal links, and body copy — gets silently ignored during indexing. Search Console will still show the URL as indexed. It won’t tell you the page was truncated.
This limit applies to the rendered HTML document only — not your total page weight. CSS, JavaScript, and images are fetched separately and have their own limits. Most page size tools measure total page weight, which is not the number Googlebot cares about. HTML Size Checker measures exactly what Googlebot measures.
Independent testing published in early 2026 showed that a 3MB HTML file got cut off mid-word at the 2MB mark, with the truncated content showing as fully indexed in Search Console. The URL Inspection tool also missed it because it uses a different crawler with a higher limit. This plugin gives you visibility that Google’s own tools don’t.
Plugin Features
- HTML Size column in the WordPress Posts and Pages list
- Color-coded indicators — green, yellow, and red at a glance
- Per-post Refresh link — re-measure any post on demand
- Bulk Scan All button — measure every published post in one click
- Sortable column — sort your entire post list by HTML size
- Cached results stored in post meta, refreshed every 7 days or on demand
- Graceful error handling for managed hosts that restrict loopback requests
- Zero front-end impact — runs exclusively in wp-admin, no effect on PageSpeed
How to Install HTML Size Checker
Installation takes under two minutes. Download the zip file below, upload it to WordPress, activate it, and run your first scan.
- Click the download button below to get the plugin zip file
- In your WordPress admin, go to Plugins → Add New → Upload Plugin
- Choose the zip file and click Install Now
- Click Activate Plugin
- Go to Posts → All Posts
- Click Scan All Posts Now in the blue notice bar at the top
- The HTML Size column populates with color-coded results for every published post
💡 Pro Tip: Always back up your site before installing any new plugin. HTML Size Checker runs only in wp-admin and makes no changes to your front-end or database structure beyond storing size measurements in post meta — but a backup is good practice regardless.
Download HTML Size Checker
⬇ Download the Free Plugin
HTML Size Checker is free, no strings attached. Download the zip, install it in WordPress, and see your post sizes in under two minutes.
Free forever. Built by AI Advantage Agency.
About AI Advantage Agency
AI Advantage Agency is a national B2B agency specializing in Answer Engine Optimization and paid media. We built HTML Size Checker because we use it ourselves — monitoring rendered HTML size is part of our technical SEO workflow for every client site we manage. We’re sharing it free because the WordPress community has given us a lot, and this is a small way to give back.
If you want help with the bigger picture — getting your content cited in Google AI Overviews, ChatGPT, and other AI engines, or running high-performance paid media campaigns — that’s what we do.
Questions about the plugin? Reach out via our contact page or email us at info@aiadvantageagency.com.
Disclaimer: HTML Size Checker is provided free of charge as-is, without warranty of any kind. AI Advantage Agency is not responsible for any issues arising from the installation or use of this plugin on your website. Always back up your site before installing new plugins.
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Frequently Asked Questions About HTML Size Checker
What does HTML Size Checker measure?
HTML Size Checker measures the rendered HTML file size of each published WordPress post or page — the full document as Googlebot receives it, including theme markup, schema, and page builder output. This is different from total page weight, which includes CSS, JavaScript, and images. Googlebot’s 2MB limit applies only to the HTML document itself.
Will this plugin slow down my site?
No. HTML Size Checker runs exclusively in wp-admin and has zero effect on your public-facing pages or PageSpeed scores. Fetch requests only run when you manually trigger a scan or click Refresh on an individual post. Nothing runs automatically in the background.
Why does Googlebot’s 2MB limit matter for SEO?
Googlebot crawls only the first 2MB of uncompressed HTML on any page. Content beyond that limit — including schema markup, internal links, and body copy — gets silently ignored during indexing. Search Console will still show the URL as indexed and won’t flag the truncation. This means important content at the bottom of large pages may be invisible to Google without any warning.
What is a safe HTML file size for WordPress posts?
The median HTML page across the web is around 33KB, and 90% of pages are under 151KB. For WordPress sites, anything under 500KB is well within safe limits. The green indicator in HTML Size Checker covers everything under 500KB. Googlebot’s 2MB limit only becomes a concern for pages roughly 67 times larger than average.
Does the plugin work on Pages as well as Posts?
Yes. The HTML Size column appears on both the Posts list and the Pages list in WordPress admin. You can run a bulk scan for posts and pages separately using the Scan All button on each respective screen.
What does “Fetch failed” mean in the plugin?
Fetch failed means the plugin could not retrieve the rendered HTML for that post. This is usually caused by a server restriction on loopback HTTP requests — common on managed WordPress hosts like WP Engine. Contact your host about enabling loopback requests. As an alternative, check individual post sizes using Chrome DevTools: press F12, go to the Network tab, reload the page, filter by Doc, and check the size of the HTML document.
How is this different from using Screaming Frog?
Screaming Frog is a desktop application that requires you to run a separate crawl of your site. HTML Size Checker lives directly inside your WordPress admin Posts list and updates on demand with a single click. There is no separate tool to open or crawl to configure — the data is always one click away while you manage your content.
Is HTML Size Checker really free?
Yes, completely free. HTML Size Checker is released under the GPL2 license with no premium version, no upsells, and no feature limits. It was built by AI Advantage Agency as a free tool for the WordPress and SEO community.