Next.js Image Optimization Not Working
Your Next.js Image component doesn't optimize images properly. Original large images load unchanged, or the Image component shows errors and falls back to regular img tags.
Image optimization fails when the Image component isn't configured correctly, external images aren't whitelisted, or the image URL format is invalid.
Error Messages You Might See
Common Causes
- Using regular img tag instead of next/image Image component
- Missing or incorrect next.config.js image configuration for external domains
- External image domain not added to images.domains array
- Image dimensions not specified (width/height required for static images)
- Using placeholder before image loads without blurDataURL
How to Fix It
Use Next.js Image: Replace <img src=... /> with import Image from 'next/image'
Set width/height: Static images need explicit dimensions: <Image src={...} width={400} height={300} />
Configure external domains: In next.config.js:images: { domains: ['cdn.example.com', 'img.example.com'] }
Enable priority: For above-fold images, add priority prop to prevent lazy-loading delays.
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Get HelpFrequently Asked Questions
When should I use next/image vs regular img?
Always use next/image for optimization. Provides automatic format conversion, responsive sizing, and lazy loading.
How do I handle images from external URLs?
Add the domain to images.domains in next.config.js. Then use Image component normally with full URL.
What's the difference between static and dynamic image dimensions?
Static: width/height known at build time. Dynamic: use fill prop with position: relative parent and CSS sizing.