What is LCP and why do images affect it?

LCP (Largest Contentful Paint) measures the time for the largest visible element on screen to load. On product pages, this is almost always the main product image. A 3 MB JPEG served without lazy-loading often produces LCP above 4 seconds — the threshold where Google's ranking algorithm penalizes the page.

WebP vs AVIF: which format should I use in 2026?

WebP for the entire catalog: 97% browser support, 30-50% lighter than JPEG, supported by Google Shopping and all major marketplaces. AVIF for hero images and key landing pages: 20% lighter than WebP but 3x slower to encode and only fully supported from Safari 16+.

Can I over-compress product images?

Yes. Below WebP quality 70, artifacts appear on skin tones, fabric textures and gradients — areas where customers scrutinize detail. Quality 80-85 is the sweet spot: 40-50% smaller than JPEG quality 80 with no perceptible quality loss on most product types.

Does Seegea optimize images automatically on every import?

Yes, optionally. When you import products, Seegea can automatically compress images to your target quality, convert to WebP and resize to your standard dimensions (e.g. 1000×1000 for Google Shopping). You can also apply optimization selectively to existing products via the grid.

Product image optimization: compression, WebP and Core Web Vitals

Image optimization is the single highest-ROI technical SEO action for most e-commerce stores. It costs zero in infrastructure (no CDN change, no theme rewrite), takes a few hours to apply at catalog scale with the right tool, and produces measurable LCP improvements within 24 hours of deployment.

Compatible platforms

The 3-step image optimization workflow

Step 1 — Audit

Run a Lighthouse or WebPageTest audit on your top 10 product pages. Identify images above 500 KB and images not served in WebP. Seegea shows image weight and format for every product in the catalog grid — sortable, filterable.

Step 2 — Compress and convert

Convert to WebP at quality 82. Resize to 2048×2048 for hero shots, 1000×1000 for thumbnails. Strip EXIF metadata (saves 50-200 KB per image). Seegea applies this pipeline in bulk with one click — no Photoshop, no CLI.

Step 3 — Deploy and measure

Push optimized images to Shopify or PrestaShop via Seegea. Wait 24h for Google to re-crawl. Check Google Search Console Core Web Vitals report for LCP improvements. Seegea keeps the original images for rollback.

Image type	Before optimization	After Seegea optimization	LCP improvement
Product photo (studio)	2.3 MB JPEG	420 KB WebP	~1.8s faster LCP
Lifestyle shot	4.1 MB JPEG	680 KB WebP	~2.5s faster LCP
White background packshot	1.8 MB PNG	210 KB WebP	~1.5s faster LCP
Variant close-up	900 KB JPEG	180 KB WebP	~0.6s faster LCP

Start with your top 50 best-selling product pages. These drive 80% of revenue and are the most crawled by Google. Optimizing these 50 first gives you 80% of the SEO and conversion benefit before you process the rest of the catalog.

Why not just use Shopify's automatic image optimization?

Shopify automatically serves images in WebP to browsers that support it — since 2020. So why does optimization still matter?

Shopify converts to WebP but does not resize. A 4000×4000 JPEG uploaded as source is served as a 4000×4000 WebP — still massive.
Shopify does not strip EXIF metadata unless you use a third-party app.
Shopify does not compress during upload beyond a basic quality threshold. Start from a 2 MB source, get a 1.8 MB WebP.

The right approach: compress and resize before uploading to Shopify. Seegea does this at scale during import or via the bulk optimization action in the catalog grid.

Built in France between Annecy and Chantilly, Seegea has processed over 500,000 product images and optimized Core Web Vitals for merchants with catalogs from 200 to 80,000 SKUs.

Optimize your catalog images with Seegea

30-min Google Meet · free LCP audit on your top 10 product pages

Optimize your catalog images with Seegea

Created in France (Annecy – Chantilly) · Email & Google Meet support

FAQ

Target 200-500 KB per image in WebP format. For a product page with 4 images, this means 800 KB to 2 MB of total image weight — well within the budget for a sub-2.5s LCP. Above 500 KB per image, the LCP degrades measurably on mobile 4G connections.