HTML document size
The size of the returned HTML in KB (and bytes), the payload the browser has to download first.
Free Web Page Size Checker
Enter a URL to measure the HTML document size, see whether the response is compressed, and count the script, stylesheet, and image requests referenced in the markup.
Check page size
Enter a URL (or domain). NorthDuty requests it and reports the HTML size, compression, and an estimate of the requests the page makes.
Free check. No signup. Results are not published or indexed.
How NorthDuty website monitoring works
Enter a URL (or domain). NorthDuty requests it and reports the HTML size, compression, and an estimate of the requests the page makes. Recurring checks are configured inside the NorthDuty app.
What this page size checker reports
A single request shows how heavy the HTML is and how many sub-resources it pulls in.
Compression
Whether the response was served with gzip or brotli compression, and which encoding was used.
Request estimate
A count of the script, stylesheet, and image references in the HTML, plus a light / moderate / heavy rating.
Resource breakdown
Separate counts of scripts, stylesheets, and images so you can see where the weight comes from.
Why check page size
Heavy pages and long request chains slow down load times and hurt Core Web Vitals — especially on mobile connections.
- See if compression is actually enabled
- Spot an oversized HTML document
- Count how many requests the page makes
- Find script and image bloat to trim
- Get a baseline before a performance pass
How the page size checker works
No signup — enter a URL and get the size and request estimate back.
1
Enter a URL
Provide a full URL or just a domain; NorthDuty defaults to HTTPS.
2
We request the page
NorthDuty fetches the HTML, following redirects safely, and reads its size and headers.
3
We analyze the markup
The HTML is scanned for script, stylesheet, and image references to estimate the request count.
4
You get a weight report
See the HTML size, compression, and request estimate with a rating — nothing is stored.
Go Beyond One-Off Checks
Use the tool preview for a quick answer, then move into recurring monitoring for your most important pages and journeys.
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How to Monitor Core Web Vitals
Learn how to monitor Core Web Vitals alongside website health checks, JavaScript errors, API calls, and user journeys.
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How Often to Monitor Your Website
How often should you check your website? A practical guide to monitoring frequency by site type, what 1, 5, and 15-minute checks mean, and how to balance speed and noise.
Read How Often to Monitor Your WebsitePricing
Pricing
NorthDuty pricing for website monitoring: Free, $29 Starter, $79 Pro, $199 Business, and $499 Enterprise plans.
Compare pricing plansFrequently Asked Questions
Answers about this diagnostic preview and when to move into recurring monitoring.
Is this page size checker free?
Yes. It's free and requires no signup. Enter a URL and you get its HTML size and request estimate immediately.
Does it measure the full page weight?
It measures the HTML document size exactly and estimates the number of requests from the markup. It does not download every image, script, and stylesheet, so it is a fast estimate rather than a full waterfall.
How is the request count estimated?
NorthDuty counts the script, stylesheet, and image references in the returned HTML, then adds the HTML document itself. Dynamically injected resources may not be included.
What makes a page 'heavy'?
The rating combines HTML size and the estimated request count. Larger documents and many requests move a page from light to moderate to heavy.
Call To Action
Start monitoring your website with NorthDuty today.
Page weight creeps up with every new script and image. NorthDuty monitors performance signals continuously so regressions get caught before they slow your site down.
Free forever plan, no credit card required — add your base URL and monitoring starts in minutes.