What is the difference between PNG and JPG?
PNG is a lossless format that supports transparent backgrounds. It suits logos, icons, and screenshots that need crisp edges, but the files are usually larger.
JPG is a lossy format that shrinks file size by discarding details the human eye barely notices. Files are smaller and compatibility is the best, making it ideal for photos and other color-rich images.
What happens to the transparent background?
The JPG format has no transparency channel, so transparent areas of the original image must be filled with a color during conversion.
This tool uses a white background by default; you can also choose black or a custom color. Picking a color that matches the background where the image will be used makes the edges look more natural.
Why is the converted file smaller?
The JPG compression algorithm discards some visually insignificant detail, so in most cases PNG to JPG produces a noticeably smaller file.
If the original image is flat-colored, text, or contains large areas of repeated solid color, JPG may have little advantage — keeping PNG might be the better choice then.
How to choose the quality parameter?
Quality ranges from 0 to 100. Higher quality means a larger file and better fidelity; lower means a smaller file with more visible compression artifacts.
For photos, 80–90 gives a good balance of size and quality. For flat-color graphics and text, use 90 or above to avoid noise at the edges.