JPG vs PNG: Two Formats, Two Jobs
JPG and PNG have coexisted for decades because they solve different problems. Picking between them is less about which is 'better' and more about what's inside the image.
Definition
JPG (JPEG) is a lossy raster format tuned for continuous-tone images like photographs. PNG is a lossless raster format designed for sharp-edged graphics, screenshots, and images that need transparency.
Why it matters
Save a screenshot as JPG and the text turns fuzzy; save a photo as PNG and the file balloons to five times its useful size. The choice affects page load, storage, and how the image survives future edits.
Advantages
- JPG makes photographs small enough for fast web delivery
- PNG keeps text, icons, and UI edges pixel-perfect
- PNG supports full alpha transparency; JPG has none
- JPG is universally supported everywhere images are accepted
- PNG is safe to re-save repeatedly without quality decay
Disadvantages
- JPG artifacts appear around sharp edges and flat color areas
- PNG files of photos are often 5–10× larger than JPG equivalents
- JPG has no transparency, forcing an opaque background
- PNG isn't ideal for photos where its size gains you nothing
- Repeated JPG saves compound the damage each time
Examples
- A vacation photo → JPG, small and good enough
- A logo with a transparent background → PNG
- A product shot with a subtle gradient → JPG at high quality
- A UI screenshot showing crisp text → PNG
- An infographic with solid colors and text → PNG
Common misconceptions
- 'PNG is higher quality than JPG', only when the content favors it
- 'JPG supports transparency', it doesn't, ever
- 'Converting JPG to PNG restores quality', it locks in the existing loss
- 'PNG is always bigger', for graphics with few colors, it's smaller
- 'PNG is outdated', it's still the right choice for many non-photo cases
Frequently asked questions
No. PNG will preserve exactly what's already in the JPG, artifacts included. It won't reverse the earlier lossy compression.
For photos, JPG almost always wins on file size. For flat graphics and screenshots, PNG can actually be smaller.
You can convert the format, but the JPG's background is baked-in pixels. You'd still need to erase or mask the background.
No, professionals pick whichever fits the content. Print photos ship as JPG or TIFF; brand assets ship as PNG or vector.