Start with dimensions before compression
Many slow pages are not slow because the image format is wrong; they are slow because the image is much larger than the space where it appears. Resize hero images, thumbnails, product photos, and social previews to realistic display dimensions before tuning compression.
Compression works best when it is applied to a correctly sized delivery copy. Keep the original master image separately, then export smaller versions for web pages, documentation, and previews.
- Resize oversized source images before compressing them.
- Use separate delivery copies for thumbnails, cards, and full-width images.
- Check the final image at the size users will actually see.
Choose modern formats carefully
WebP is a strong default for many modern websites because it can reduce file size while preserving acceptable quality. AVIF can be even smaller, but support, encoding time, and visual artifacts should be checked for your audience.
Do not convert every image blindly. UI screenshots, transparent assets, icons, and product photos have different quality needs. Compare the output before replacing a proven format.
Image SEO depends on speed and context
Fast images help users reach the content sooner, and search systems can reward pages that load reliably. Use descriptive file names where possible, place images near relevant text, and avoid uploading huge files that force browsers to do unnecessary work.
When an image is part of a guide, product page, or tool page, optimization should happen before publishing so crawlers and visitors see the finished version immediately.