You have a PNG screenshot that is too heavy for an email, or a JPG photo that needs a transparent background for a design project. Converting between PNG and JPG solves both problems, and it takes seconds once you know what to expect from each direction.
This is usually done to reduce file size. PNGs preserve every pixel exactly, which makes them large — especially for photographs. Converting to JPG applies lossy compression, shrinking the file significantly. The one thing to know: JPG does not support transparency, so any transparent areas in your PNG will be filled with a solid background color — usually white — during conversion.
This is usually done when you need transparency, or when you are preparing an image for further editing where lossless quality matters — for example, adding a logo on top of a background in a design tool. Converting JPG to PNG does not restore any detail lost during the original JPG compression, but it does prevent further quality loss during additional edits and re-saves.
If you have a folder of mixed PNG and JPG files that all need to be one consistent format — for example, preparing a product catalog — convert them in a batch rather than one at a time. Keep the same target format and quality setting across the batch so your final set of images looks consistent.
Format conversion alone does not always solve a file size problem. If your converted image is still too large, run it through the Image Compressor. If the dimensions are larger than needed, use the Image Resizer first — this combination gets you the smallest, cleanest file for whatever platform you are uploading to.
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