Compress Images for Shopify Product Pages — Speed That Sells
Shopify is generous with image hosting but stingy with image optimisation. Out of the box, your gallery photos can each be 4–6 MB — enough to tank your mobile speed score and quietly cost you sales. Here's the fix.
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JPG, PNG, WebP · Up to 10 images · Max 20 MB each
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How Shopify handles images by default
Shopify automatically generates several sizes of every uploaded image and serves WebP to supporting browsers. That sounds great, but the source file is still what dictates the upper bound — a 6 MB original gets re-compressed into a still-too-big WebP.
Pre-compressing before upload gives Shopify a smaller, sharper starting point, which means smaller (and visually better) auto-generated variants.
Target sizes for Shopify product images
- Hero / first product photo: 200–400 KB after Shopify processing.
- Gallery photos: 100–250 KB each.
- Variant swatches and thumbnails: under 30 KB each.
- Lifestyle / banner imagery: 300–500 KB at 1920 px wide.
Step-by-step
- Export your product photos at the largest size you'll ever display — usually 2048 px on the longest side.
- Drop the batch into the compressor on our homepage.
- Use 80% quality for clean studio shots, 75% for lifestyle photography.
- Download as ZIP and bulk-upload to your Shopify product.
Why this matters for conversion
Shopify's own data shows that every 100 ms of LCP improvement translates to roughly a 1% lift in conversion rate on product pages. For a store doing £1,000/day, that's £3,650 a year per 100 ms saved.
Compressing your top 20 product images can easily save 1.5 seconds of LCP on mobile — the kind of change that pays for a year of premium plan upgrades in a few weeks.
Bonus: alt text matters too
While you're updating product images, write proper alt text. Shopify pulls alt text into Google Image Search results, and image search is a meaningful traffic channel for e-commerce. 'Navy linen shirt, front view, men's medium' beats 'IMG_4823.jpg' every time.
Frequently asked questions
Does Shopify already compress my images?
Yes, but conservatively. Pre-compressing gives Shopify a smaller starting point and produces noticeably smaller final variants.
Will compression hurt zoom quality on product pages?
Not if you start from a 2048 px source compressed at 80% quality. Shoppers can still zoom in cleanly.
Can I batch-replace images on existing products?
Yes — use the Shopify bulk editor or a CSV import. Compress first, then bulk-upload the optimised versions.
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