Images can make content clearer and help visitors understand a topic. However, oversized files or images without useful context can slow down a page and reduce accessibility.
Key Concepts
Choose formats based on the use case. WebP or AVIF can reduce file size in many situations, while SVG is suitable for icons and vector artwork. Match image dimensions to their display size and compress files while maintaining acceptable visual quality.
Practical Steps
Use descriptive file names and alternative text that explains an image’s information or function. Decorative images may use empty alt text. Lazy-load below-the-fold images, but avoid delaying the main image that contributes to LCP. Set width and height to reduce layout shifts.