PNG vs JPG: Which Image Format Should You Use?
PNG and JPG are the two most used image formats — but they're designed for completely different types of content. Here's how to pick the right one every time.
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PNG and JPG are not interchangeable — they excel at completely different types of images. Using JPG where PNG is appropriate (logos, screenshots) creates blurry artefacts. Using PNG where JPG is appropriate (photographs) creates unnecessarily large files. The correct choice is determined by the image content, not personal preference.
PNG vs JPG: Key Differences
| Property | PNG | JPG |
|---|---|---|
| Compression | Lossless | Lossy |
| Transparency | Full alpha channel | None |
| Colour depth | Up to 48-bit | 24-bit |
| File size (photos) | Large | Small |
| File size (graphics) | Small–Medium | Large |
| Re-save quality | No degradation | Degrades each save |
| Best content type | Screenshots, logos, icons | Photographs, complex images |
| Browser support | Universal | Universal |
When to Use PNG
- Screenshots and screen captures — sharp text and flat-colour areas compress efficiently
- Logos and brand assets — especially when a transparent background is needed
- Graphic design assets, icons, and UI elements
- Images containing text overlays where crispness is critical
- Source/master files that will be edited and re-exported later
- Images with large areas of solid colour (infographics, charts, diagrams)
When to Use JPG
- Photographs — JPG's lossy compression is imperceptible on complex photographic detail
- Product images for e-commerce (without transparency requirements)
- Background images for web pages
- Social media photos where file size matters
- Any image with continuous colour gradients (sunsets, skin tones, food photography)
- When transparency is not required and file size is a priority
File Size Comparison
For photographs, JPG is typically 5–10× smaller than PNG at equivalent visual quality. A 12 MP photo might be 3 MB as PNG and 300 KB as JPG at 85% quality. The comparison reverses for graphics: a logo or screenshot saved as PNG is often smaller than JPG because lossless compression handles flat colours efficiently, while JPG's block-based compression creates visible artefacts on crisp edges and text.
The modern alternative
In most cases, WebP outperforms both PNG and JPG — 25–35% smaller than JPG for photos and 25–45% smaller than PNG for graphics, with transparency support. If browser support allows (95%+ of modern browsers), use WebP instead.
Converting Between PNG and JPG
Converting PNG to JPG is a one-way lossy process — you permanently discard the lossless quality of the PNG. Do this only when you need a smaller file and transparency is not required. Converting JPG to PNG does not recover any quality — you simply get a lossless container holding the already-compressed JPG pixels. The file will be larger but not higher quality.
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Frequently Asked Questions
Does converting PNG to JPG reduce quality?
Yes — JPG uses lossy compression, so converting a PNG to JPG discards some image data. The quality reduction is controlled by the quality setting (1–100). At 85+ quality, the difference is typically invisible to the human eye for photographic content, but visible on crisp text and logos.
Can JPG have a transparent background?
No. JPG does not support transparency. Any transparent areas in an image saved as JPG will be filled with white (or a background colour). Use PNG, WebP, or SVG if you need a transparent background.
Which is better for printing — PNG or JPG?
For print, both work, but PNG's lossless quality makes it preferable for professional printing, especially for graphics with sharp edges. For high-resolution photographs going to print, TIFF is the professional standard — it stores full-quality uncompressed or losslessly compressed image data.