Platforms6 min read·Updated

OpenCart WebP Images for Category and Product Pages

OpenCart themes often point at JPEG paths in `image/catalog`. Convert those files to WebP and either update extensions to `.webp` or enable a WebP swap. Pre-sizing to 1000–1400 px does most of the performance work even before the swap.

The catalog folder is the bottleneck

Every product image lives as a file. Huge JPEGs mean heavy caches and slow image resizing in the admin. WebP masters at 1200 px typically cut listing-page weight in half.

Why it matters

  • Listing pages are the SEO landing pages.
  • Cheap OpenCart hosts struggle with GD on large images.
  • Many 'WebP modules' just rewrite extensions.

How to do it

  1. Copy image/catalog locally.
  2. Bulk convert, keep filenames, output .webp.
  3. Upload and switch the theme/module to WebP, or replace if the theme serves by basename.

Settings that work

1200–1400 px / 80% for products. Category banners 1920 / 75%.

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Put it into practice

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Frequently asked questions

3.x and 4.x themes vary. File-level WebP plus a small theme change works on all of them.

Only if you want automatic JPEG→WebP negotiation. If you replace files and update paths, no.

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