Google Images drives 20-30% of all Google searches. Here's how to rank there.
File Names
sunset-beach-california.jpg > IMG_4582.jpg. Use descriptive, keyword-rich file names before uploading.
Alt Text
Describe what's IN the image, not what the image IS FOR. Good: 'Golden retriever puppy playing in autumn leaves.' Bad: 'Featured image for our dog article.'
Technical
Use WebP format (25-35% smaller). Compress images (our compressor keeps quality). Add width/height attributes. Use responsive images with srcset.