Describe the image accurately and specifically
Include the main subject and purpose of the image
Use relevant keywords naturally
Keep the text concise and clear
Avoid keyword stuffing
Skip phrases like “image of” or “picture of” unless needed for clarity
Include important details that add context
Mention text shown in the image if it matters
Describe functional images based on their role
Leave decorative images with empty alt text if appropriate
Match the alt text to the page content
Write for accessibility first, SEO second
Use proper spelling and grammar
Keep it under about 125 characters when possible
Make each alt text unique for each image