Optimize images in an AI-generated website: dimensions, formats and useful detail

A worked example: where the task becomes difficult

A fictional website displays a multi-megabyte generated hero at a modest width on phones and loads ten below-the-fold illustrations immediately. The images look sharp but delay the useful answer. Inventory actual rendered sizes and importance. A logo, a workflow diagram and a photographic hero need different treatments; shrinking everything uniformly can damage readability.

Decisions to make before implementation

Choose responsive variants and compression based on content. Vector diagrams may be preferable to raster text screenshots. Distinguish the main loading image from later supporting assets when selecting loading behavior. Keep source files separate from optimized delivery variants. Verify format support and the actual framework image configuration rather than assuming a file extension alone changes transfer size.

A practical sequence for the work

Use the sequence below as a task boundary, not as a claim that the example has been executed. Work with approved inputs and the project’s actual architecture. If a required integration or permission is unavailable, keep that stage visibly incomplete rather than generating a plausible substitute result.

• Inventory image dimensions, transfer sizes and rendered roles.
• Generate right-sized variants with suitable quality and format.
• Reserve aspect-ratio space and set intentional loading priorities.
• Review actual phone crops, legibility and network transfers.

A detailed brief you can adapt for your agent

Replace the illustrative context with your approved facts and controlled inputs. Keep the stated boundaries when adapting the brief. The expected deliverable matters more than a particular tool name: ask for an explanation grounded in the inspected material and evidence for the requested outcome.

Optimize the supplied permitted assets for their actual roles. Measure rendered and source dimensions, then choose responsive variants and quality. Keep the primary image available promptly and defer nonessential media appropriately. Reserve layout space and preserve diagram meaning and alternatives. Verify actual transfers rather than only renaming file extensions.

Failure modes that an attractive preview can hide

Overcompression can make diagrams or product details unusable. Lazy-loading the primary visible image can delay the page’s main content. Avoid generated photographs that misrepresent an actual product. Optimization should preserve truthful context and meaningful alternatives, not simply make an image disappear from a performance test.

Technical references: Google: Web Vitals

Acceptance checks and the evidence to retain

Keep the asset inventory, optimized variants, transfer comparison and visual checks. Record any quality tradeoffs that affect the reader’s task.

Specific answers

Common questions