PNG vs JPG: Which Image Format Should You Use?

The core difference: lossy vs lossless

JPG uses lossy compression: it permanently discards image detail the human eye is least likely to notice, in exchange for dramatically smaller files. For a photograph — with its smooth gradients and millions of subtly different colors — this trade is almost invisible and hugely effective, which is why virtually every photo online is a JPG.

PNG uses lossless compression: it stores every pixel exactly, so nothing is thrown away and the image can be re-saved endlessly without degrading. That fidelity is essential for screenshots, logos, diagrams and anything with hard edges or text, where JPG’s lossy approach produces ugly “artifacts” — smudges and halos around sharp lines. The cost is size: a lossless PNG of a photograph is far larger than the equivalent JPG.

Transparency and color

PNG supports transparency through an alpha channel, so parts of the image can be fully or partially see-through — indispensable for logos, icons and cut-out subjects that need to sit on any background. JPG has no transparency at all; it must fill every pixel with a solid color, which is why a cut-out saved as JPG ends up on a white (or other solid) background.

Both handle full color, but PNG’s exact storage makes it the reliable choice for flat areas of solid color and crisp boundaries, where JPG can introduce faint banding or blocking.

When to use each

Use JPG for photographs and photo-like images where a small file matters and there are no hard edges to protect: camera photos, website hero images, email attachments, social posts. Use PNG for screenshots, logos, icons, diagrams, charts, text-heavy graphics, and anything that needs a transparent background or must survive repeated editing without quality loss.

A common mistake is saving a screenshot or a logo as JPG to make it smaller — the result looks fuzzy around the text and edges. Another is saving a large photograph as PNG, which produces an enormous file for no visible benefit. Matching the format to the content avoids both.

How to convert and optimize

Converting between the two is quick with an image converter: turn a PNG into JPG to shrink a photo-like image, or a JPG into PNG when you need lossless quality or transparency (though converting an existing JPG to PNG will not restore detail JPG already discarded). Whichever you use, compressing the final image and resizing it to the dimensions it will actually be displayed at usually saves far more space than the format choice alone. OfficePad’s image tools run entirely in your browser.

Frequently asked questions