JPG vs PNG: Which Should You Use?
ImageRW Guide · Practical image workflow
The extension is only one part of an image workflow. The image content and destination determine which format is practical.
Quick takeaways
- JPG is usually a practical fit for photographs.
- PNG is useful when transparency or crisp graphics matter.
- Compare real files instead of assuming one format is always smaller.
Original ImageRW diagram: JPG vs PNG: Which Should You Use?.
JPG in practical terms
JPG uses lossy compression and is widely supported. It is often a good fit for photographs because it can discard subtle information that is difficult to notice while reducing file size.
PNG in practical terms
PNG uses lossless compression and supports transparency. It is useful for logos, interface graphics, screenshots and other images where sharp edges or transparent areas matter.
Why the same image behaves differently
A photo contains many gradual color changes, while a flat graphic may contain large areas of identical colors and sharp boundaries. Compression algorithms respond differently to these patterns.
A simple decision process
Ask whether the image is photographic, whether transparency is required, whether sharp text or edges are important, and whether the destination has format constraints.
Do not assume one format wins
A format can be excellent for one image and inefficient for another. Compare actual output files when file size matters.
What about WebP?
WebP can be considered when a modern web delivery workflow supports it. It offers both lossy and lossless modes and transparency, so it can cover several use cases.
A quick format decision table
| Typical source | Often worth considering | Main reason |
|---|---|---|
| Photograph | JPG or WebP | Good fit for continuous-tone imagery |
| Transparent logo | PNG or WebP | Transparency support |
| Screenshot with small text | PNG or WebP | Can preserve crisp edges and text |
Frequently asked questions
Is PNG higher quality than JPG?
PNG is lossless, but that does not mean every PNG is visually better for every purpose. JPG can be visually excellent at a sensible quality setting.
Why is PNG larger for photos?
Lossless compression often cannot reduce photographic data as efficiently as JPEG compression.
Which should I use for a logo?
If transparency or crisp graphic edges matter, PNG is often a practical choice; compare the actual destination requirements.
Image content varies. Test representative files, keep the original and judge the output in the context where people will actually see it.