E-commerce8 min read
How to Optimize Images for E-commerce and Improve Conversion
Complete image optimization checklist for online stores: size, format, alt text, lazy loading, and visual consistency.
Why images impact conversion and SEO
Product images are the main purchase decision factor in e-commerce. At the same time, heavy images are the main cause of slow pages, which increases bounce rate and hurts Google rankings.
Image optimization checklist for e-commerce
- Size: 800-1200 px wide for zoom. Not larger than necessary.
- Format: WebP for web, PNG for transparency, JPG for photos.
- Compression: quality between 75-85% for JPG/WebP.
- File name: use keywords (e.g., nike-air-max-black-sneaker.jpg).
- Alt text: describe the product with the main keyword.
- Lazy loading: load images only when needed.
- CDN: serve images from servers close to the user.
- Consistency: same background, lighting, and framing across all products.
Practical tip: For stores with hundreds of products, use Lumageni's batch compression tool to process the entire gallery at once. The speed gain is worth the conversion difference.
Speed impact on conversion
- Each additional second of loading reduces conversion by ~7%.
- Pages that load in under 2 seconds convert 2x more than slow pages.
- Google considers speed in ranking (Core Web Vitals).
- Mobile is more sensitive — users abandon faster on slow connections.
Want to try it now?
Every tool mentioned in this article is available on Lumageni.