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JPG to PNG makes a lossless copy of the image — useful when a tool, form or workflow insists on PNG input, or before editing so repeated saves don't compound JPG's compression. The conversion runs locally and won't restore detail JPG compression already discarded: it preserves exactly what's there, in a format that won't degrade further.
Frequently asked questions
Will converting JPG to PNG improve quality?
No — compression artifacts already in the JPG are preserved faithfully. What PNG buys you is that nothing further is lost, no matter how many times the file is opened and saved.
Why is the PNG bigger than my JPG?
PNG stores the image losslessly, and photographs have a lot of detail to store — 3–8× larger is normal. That's the price of a format that never degrades.