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When to Use PNG vs. Other Formats
- PNG: Screenshots, logos, icons, UI elements, images with text, images requiring transparency
- JPEG: Photographs, images with gradients, when file size matters more than perfect quality
- WebP: Modern alternative that offers both lossless and lossy modes with better compression than PNG or JPEG
- SVG: Logos and icons that need to scale to any size without quality loss
- GIF: Simple animations (though WebP and APNG are better modern alternatives)
Examples
Example 1: Compressing a Screenshot
Screenshots with large areas of solid color compress extremely well:
File: dashboard-screenshot.png
Original Size: 1.8 MB
Compressed Size: 540 KB
Reduction: 70%
Quality Loss: None (pixel-perfect identical)
Optimizations Applied:
✓ Color palette optimization (reduced to 256 colors)
✓ Metadata removal (stripped 12 KB of EXIF data)
✓ Filter optimization (adaptive per-row filtering)
✓ Chunk optimization (removed unnecessary chunks)
Screenshots are the best candidates for PNG compression because they typically have large uniform areas and limited color ranges.
Example 2: Compressing a Logo/Icon
File: company-logo.png
Original Size: 245 KB
Compressed Size: 38 KB
Reduction: 84%
Quality Loss: None
Optimizations Applied:
✓ Indexed color mode (logo uses only 47 distinct colors)
✓ Metadata removal
✓ Adaptive filtering
Logos and icons with flat colors and sharp edges are ideal for PNG compression. The palette optimization alone can reduce file size by 50-75% for images with fewer than 256 colors.
Example 3: Compressing a Photograph Saved as PNG
File: product-photo.png
Original Size: 4.2 MB
Compressed Size: 3.6 MB
Reduction: 14%
Quality Loss: None
Note: Photographs have high color variation across
millions of colors. Palette optimization cannot be
applied. Consider converting to JPEG (lossy) or
WebP for significantly smaller file sizes.
Photographs saved as PNG compress less dramatically because they use millions of colors. For photos, JPEG or WebP are usually better format choices unless you specifically need lossless quality.