Slow, heavy product pages lose sales. This tool runs Google's official Lighthouse audit (via the PageSpeed Insights API) against any URL you give it and pulls out what matters for stores: Core Web Vitals, how many kilobytes your images are wasting, heading structure, SEO basics and accessibility.
Below the automated report there's a hand-built checklist of product-page best practices — CTA placement, trust signals, mobile ergonomics — the things a machine can't fully judge but a designer should tick off.
How to use
- Paste the URLAny public product page. Choose mobile or desktop.
- Read the reportFour scores, Core Web Vitals, image-savings estimates and structure audits, in ~30 seconds.
- Walk the checklistTick through the manual e-commerce checks below the report.
Run a real Lighthouse audit on any product page
Paste a public URL and this tool runs Google Lighthouse through the PageSpeed Insights API, then returns the four familiar scores: performance, accessibility, SEO, and best practices. It's the same engine that powers Google's own report, so the numbers line up with what search teams actually look at.
You get the Core Web Vitals that matter for ranking and user experience, LCP, CLS, TBT, and FCP, alongside image-weight savings and a breakdown of heading structure and SEO audits. It's a quick health check before you push a page live or hand it to a client.
Beyond scores: an e-commerce best-practice checklist
Raw Lighthouse numbers tell you a page is slow, but not always why it won't convert. On top of the audit, this tool adds a hand-built e-commerce checklist covering call-to-action clarity, trust signals, mobile behavior, and structured data (schema) so you catch the things Lighthouse doesn't grade.
If you're hitting the shared rate limit, you can paste your own Google API key into an optional field. The key is stored only in your browser and used to raise your quota, so heavy testing days don't get throttled.
What people use it for
Pre-launch product page check — Audit a new listing or landing page before it goes live to catch speed and SEO problems early.
Core Web Vitals troubleshooting — See LCP, CLS, TBT, and FCP for a page to find which metric is dragging down the score.
Image weight cleanup — Read the image-savings report to find oversized photos that are bloating page load.
Client and agency reporting — Pull an objective Lighthouse score and checklist to show a client exactly what to fix.
Competitor page benchmarking — Run the same audit on a competitor's public URL to compare speed and SEO head to head.
Accessibility spot-check — Get an accessibility score and audit list to catch obvious barriers before a review.
Conversion-readiness review — Use the e-commerce checklist to verify CTAs, trust signals, and mobile layout are in place.
Heavy testing without throttling — Add your own Google API key to run many audits in a session without hitting the shared quota.
A slow product page loses sales before anyone reads the description
On a product page, every second of load time is measured in lost conversions. Shoppers on mobile data abandon a page that stalls, and search ranking factors in speed too, so a heavy page costs you twice — fewer visitors, and fewer of them staying. The usual culprit on e-commerce pages is images: an un-optimized hero shot, a stack of full-resolution gallery photos, and a long detail image can quietly add several megabytes to a page that should weigh a fraction of that. The problem is that "my page feels slow" is a hunch, and you can't fix a hunch. You need numbers, and you need them pointed at the things a seller can actually change.
Google's PageSpeed Insights runs Lighthouse and gives you those numbers, and it's the industry reference for a reason. But its raw report is built for web developers — it surfaces render-blocking scripts and main-thread timing alongside the image issues, and it doesn't frame anything around what matters for a listing. GTmetrix layers a nicer dashboard on similar data but is likewise general-purpose. What a seller wants is the same trustworthy engine with an e-commerce lens on top: how heavy are my images specifically, and does this page pass the checklist that actually moves conversions?
This page auditor calls Google's PageSpeed Insights API — the same Lighthouse engine — and presents the results with a seller's priorities in front: the performance score, an image-weight report that shows how much of the page is pictures and which ones to compress, and an e-commerce checklist covering the things listings routinely get wrong. It adds a focused lens on top of a source you can trust rather than inventing its own scoring. One thing to be clear about: this tool requires an internet connection. It queries Google's servers to run the audit, so unlike the other tools here it does not work offline — that's an honest and unavoidable part of how it works.
What makes it different
- Google's engine, a seller's framing. The scores come from PageSpeed Insights / Lighthouse — the standard reference — reorganized around what an online seller can act on.
- Image-weight report. See how many megabytes of the page are images and which specific ones are the heavy hitters, so you know exactly what to run through a compressor or resizer.
- E-commerce checklist. A practical audit of the things product pages commonly miss, layered on top of the raw metrics.
- Trustworthy source, not a black box. It reports Google's numbers rather than a made-up score you can't verify.
- Free, no sign-up. An optional API key lets you avoid the shared public quota if you run many audits.
- Honest limitation: needs internet. It calls Google's API, so it cannot run offline like the browser-only tools.
IMG.DIY vs other page tools
| IMG.DIY Page QA | PageSpeed Insights (raw) | GTmetrix | |
|---|---|---|---|
| Underlying engine | Google Lighthouse (PSI API) | Google Lighthouse | Lighthouse-based |
| E-commerce checklist | Yes | No | No |
| Image-weight focus | Yes, seller-framed | Present but buried | Present |
| Framing | Seller priorities | Developer-oriented | General web perf |
| Price | Free | Free | Free tier + paid |
| Sign-up | None (optional API key) | None | For saved history |
| Needs internet | Yes — required | Yes | Yes |
To be fair, if you're comfortable reading a developer report, raw PageSpeed Insights gives you everything and is authoritative — this tool sits on the very same engine. GTmetrix offers historical tracking and a polished dashboard that are genuinely useful for ongoing monitoring. What this adds is the e-commerce lens: it takes Google's trusted measurements and points them at image weight and a seller's checklist, so the output reads as "here's what to fix on your listing" instead of "here's a wall of web-performance metrics." Just remember it needs a connection — it's the one tool here that can't work offline, by design.
Why IMG.DIY
Real Lighthouse
Official Google audit engine, not a lookalike.
Image focus
Exactly how many KB your images waste and how to fix it.
E-commerce checklist
CTA, trust, mobile and schema checks a bot can't score.
No key needed
Runs from your browser against Google's public API.