Image Optimization for the Web
Page loading speed is critical for user experience and SEO rankings. Images typically make up 50-80% of page size. In this guide, we cover all aspects of image optimization for the web.
Image Format Comparison
JPEG
Ideal for photographs and complex images. Uses lossy compression. Does not support transparency.
PNG
For logos, icons, and images requiring transparency. Lossless compression. Larger file size than JPEG.
WebP
Modern format. 25-34% smaller than JPEG. Supports both lossy and lossless compression plus transparency.
Optimization Steps
- Choose the right format: Photo = JPEG/WebP, Logo = PNG/SVG
- Resize: Upload images at the size they'll be displayed (don't use a 2000px image at 400px)
- Compress: Keep quality setting between 70-85%
- Use lazy loading: Defer loading images below the fold
- Use a CDN: Distribute images globally
Size Recommendations
- Blog image: 1200x630px (also suitable for social media sharing)
- Thumbnail: 300x200px
- Hero banner: 1920x600px
- Product photo: 800x800px
Conclusion
Image optimization dramatically improves web performance. With PdfMetric's free image compression, resizing, and format conversion tools, you can easily optimize your images.