Image SEO means making useful images easy to understand, load and discover. Use relevant images, descriptive alt text, sensible filenames, responsive sizing and strong surrounding page context.
Images can explain products, processes and results better than text alone. Optimization should improve both accessibility and performance instead of turning every alt attribute into a keyword field.
Use images that add information
Original screenshots, product photos, diagrams and examples can support the page topic more strongly than generic decoration.
Place important images near the text they explain so the surrounding context is clear.
Write alt text for the image purpose
Describe informative images in a concise way that helps someone understand what the image contributes. Decorative images can use empty alt attributes when appropriate.
Do not repeat the target keyword in every image description.
Choose clear filenames and formats
A descriptive filename is easier to manage than a camera-generated string. Modern formats and sensible compression can reduce file size.
The best format depends on the image type and browser support, so optimize for quality and load performance.
Serve responsive image sizes
Do not force a phone to download a huge desktop image when a smaller version would look the same. Responsive markup can help browsers choose the right resource.
Reserve image dimensions where possible to reduce layout shifts.
Keep important images crawlable
Images should be available to search crawlers and included in normal indexable pages. Avoid hiding key content behind interactions that prevent discovery.
Image sitemaps can help in some cases, especially when images are discovered through more complex setups.
Measure performance after changes
Check page experience and visual quality after compression or format changes. An image optimization that damages product detail can hurt users.
Use real page metrics and device testing rather than optimizing only for a tool score.
Common questions
Does every image need alt text?
Informative images need useful alternatives. Decorative images can often use empty alt text so assistive technology can skip them.
Should filenames contain keywords?
Use short descriptive filenames when practical, but do not stuff or rename files only to repeat keywords.
Can large images hurt SEO?
They can hurt user experience and performance when unnecessarily large. Optimize size while preserving the quality needed for the page.
Final takeaway
Optimize images for understanding, accessibility and speed. Clear context and useful media are more important than mechanical keyword placement.