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Drop one JPG or two hundred. Batch conversion is not a paid feature here.
Convert JPG to PNG
A JPEG is about to be edited, layered or repeatedly re-saved, and every extra JPEG save would compound the damage.
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What actually changes
JPG and PNG are not the same picture in two wrappers.
The JPEG is decoded once and stored losslessly as PNG. From that point on, saves cost nothing in quality. The file typically grows by two to five times, because PNG cannot compress photographic noise the way DCT can.
Worth knowing first
Converting to PNG does not undo JPEG compression. The blocking and ringing already in the image are preserved exactly, just in a bigger file. PNG also gives you an alpha channel, but it starts fully opaque; it does not find a subject and cut it out.
Questions
JPG to PNG, answered
Will this make my photo sharper?
No. Nothing is added. PNG only guarantees that no further quality is lost from this point forward.
Why did my file get bigger?
PNG is lossless. It has to store every pixel of the photo, including the sensor noise, where JPEG was free to approximate all of it.
How to convert JPG to PNG
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Choose your settings
Portable Network Graphics is lossless, so nothing is thrown away in the conversion.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.