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Shopify fix guide

Responsive Images Missing srcset or sizes Attributes on Shopify

Images are served without srcset or sizes attributes, forcing browsers to download full-size images regardless of the viewport. This wastes bandwidth on mobile and smaller screens.

Issue ID: CWV-SRCSET-SIZES-001Severity: moderateEffort: S

Why this matters

Images are served without srcset or sizes attributes, forcing browsers to download full-size images regardless of the viewport. This wastes bandwidth on mobile and smaller screens. This affects load speed, Core Web Vitals, and how many visitors stay long enough to convert.

Shopify fix path

How to fix this on Shopify

Use theme settings, page settings, or theme code.

  1. 1Find the source of the issue in Shopify admin.
  2. 2Apply the change.
  3. 3Preview and publish.

After you fix it

  • Inspect key images in DevTools and confirm srcset and sizes attributes are present

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