Technical check group

Images checks

Optimize image sizes to be under 100KB to improve load times and SEO. The catalogue currently contains 9 checks in this group.

Operating ledgerEXAMPLE / TRACE

Example evidence, review, and verification states
State	Evidence	Owner
Observed	ImagesPage-level source retained	Audit
Reviewed	Decision recordedScope and value inspected	Human
Verified	Public response readOutcome has separate proof	System

Synthetic product illustration. It demonstrates state meaning and does not represent a customer result.

Rule catalogue

Review each condition before turning it into work.

Optimize image sizes to be under 100KB to improve load times and SEO.

Include alt text for all images to improve accessibility and SEO.

Specify image dimensions to prevent layout shift and improve Core Web Vitals.

Use descriptive filenames like "red-running-shoes.jpg" instead of "IMG001.jpg" for better SEO.

Use JPEG for photos, PNG for graphics with transparency, and WebP for better compression.

Images over 500KB significantly impact load times. Compress or resize for web use.

All images should have an alt attribute, even if empty for decorative images.

Images should be served at the dimensions they are displayed. Resize images to avoid bandwidth waste.

Without width and height the browser cannot reserve space, so the page shifts as images load — the layout shift Core Web Vitals measures.