Image Size SEO Calculator
Optimize your website images for SEO and lightning-fast page speed
Pro Tip: Properly optimized images can improve page load times by 50% or more, significantly boosting SEO rankings.
The width at which the image will be displayed on your website
Check this if you want to optimize for high-resolution screens
Image Optimization Recommendations
Recommended Dimensions
Width:0 px
Height:0 px
Aspect Ratio:-
File Size Target:-
Format & Compression
Best Format:-
Quality Setting:-
Compression Level:-
Implementation Guide
- Analyze your image to see specific recommendations
SEO Recommendations
- Analyze your image to see specific recommendations
Image Optimization for SEO: Key Principles
Size Guidelines
- Hero Images: 1200-2000px width, under 300KB
- Content Images: 600-1200px width, under 150KB
- Thumbnails: 200-400px width, under 50KB
- Logos: Exact display size, under 30KB
Performance Impact
- Images account for 50-60% of page weight
- 1 second delay = 7% reduction in conversions
- Proper optimization can improve LCP by 40%
- WebP images are 30% smaller than JPEG
"Websites with optimized images load 2-3x faster and see 20-30% better SEO performance, according to recent case studies."
Optimal Image Formats by Use Case
| Image Type | Best Format | Alternative | Quality Setting |
|---|---|---|---|
| Photographs | WebP (75-85%) | JPEG (70-80%) | Balanced |
| Graphics/Logos | PNG-8 | SVG | Lossless |
| Screenshots | WebP (80-90%) | PNG-24 | High |
| Backgrounds | JPEG (60-70%) | WebP (65-75%) | Performance |
Compatibility Note: While WebP offers superior compression, provide fallback JPEG/PNG for browsers that don't support it (like older Safari versions).
Frequently Asked Questions
Why does image size affect SEO?
Image size directly impacts page load speed, which is a key Google ranking factor. Large, unoptimized images slow down your site, hurting user experience and search rankings. Properly sized images also help with Core Web Vitals metrics.
What's the difference between display size and file size?
Display size refers to the dimensions (width/height in pixels) an image appears on screen. File size is how much storage space the image file takes (in KB/MB). You can have a large display size with small file size through proper compression.
How do I choose between WebP, JPEG and PNG?
Use WebP for most photographic images (best compression). JPEG for maximum compatibility. PNG for graphics with transparency or needing lossless quality. AVIF offers even better compression but has limited browser support.
Should I use retina/HiDPI images?
For high-traffic sites where visual quality is critical, yes. For most sites, standard resolution with good compression is sufficient. If using retina, serve appropriately sized images using srcset to avoid unnecessary large downloads.
How can I check if my images are properly optimized?
Use Google's PageSpeed Insights, Lighthouse, or WebPageTest. These tools identify oversized images and suggest optimal formats. Also check your image file sizes compared to our calculator's recommendations.