The fundamental difference between PNG and JPG is the type of compression: JPG uses lossy compression, discarding part of the data to produce smaller files. PNG uses lossless compression, preserving every pixel exactly as in the original. This distinction determines everything — quality, file size, transparency, and each format's best use case.
Direct comparison
| Feature | PNG | JPG |
|---|---|---|
| Compression type | Lossless | Lossy |
| Transparency (alpha channel) | ✅ Supported | ❌ Not supported |
| Ideal for photographs | ❌ No — large file | ✅ Yes — very efficient |
| Ideal for logos and icons | ✅ Yes — sharp edges | ❌ No — visible artifacts |
| Ideal for screenshots with text | ✅ Yes | ❌ No — blurry text |
| File size (photo) | 3–10× larger than JPG | Baseline (1×) |
| Re-saving with no cumulative loss | ✅ Yes | ❌ No — degrades with every save |
| Compatibility | Universal | Universal |
| Animation support | ❌ Not native | ❌ No |
How each one compresses the image
JPG divides the image into 8×8 pixel blocks and applies the Discrete Cosine Transform (DCT) to eliminate high-frequency information the human eye notices less. In photos — with smooth gradients and natural color variation — this discarding is almost imperceptible. On sharp edges and areas of flat color (text, logos, icons), the 8×8 blocks create visible blotches called JPEG artifacts.
PNG uses the DEFLATE algorithm (lossless compression) to reorganize pixel data more efficiently without discarding anything. Every pixel is preserved exactly. For photos, this approach is inefficient — huge files with no visual gain. For images with sharp edges and areas of flat color, the absence of artifacts makes all the difference.
⚠️ Watch out for JPG compression cycles: every time a JPG is opened and saved again, compression is applied on top of already-compressed data. After 5–10 cycles, the degradation becomes visible. Always work from the original file and export to JPG only at the final step.
When to use PNG
- Logos, icons, and brands that need a transparent background
- Screenshots with text
- Infographics and illustrations with sharp edges
- Images that will be edited and re-saved multiple times
- Digital art with solid color areas
When to use JPG
- Photographs for the web, blogs, and e-commerce
- Product images, banners, and website heroes
- Any photo where transparency isn't needed
- Email marketing (maximum compatibility)
- Photo printing
What about WebP?
WebP is the modern format that competes with both: it produces files 25–35% smaller than JPG for photos and 20–30% smaller than PNG for graphics, with transparency support. For web use in 2026, WebP is the more efficient choice in practically every case where JPG or PNG would be used. See the complete comparison in PNG vs WebP and JPG vs WebP.
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