Turn a JPG into a PNG — for a form, editor, or tool that asks for PNG by name. First time? Add the picture and press Convert. Free, no signup, no watermark.
Does converting to PNG improve quality? No — honest answer: PNG keeps exactly the pixels the JPG already has; it cannot restore detail JPG removed. Convert when a tool requires the PNG format, not for quality.
Will the file get bigger? Usually yes, often several times bigger. PNG is a lossless format; photos are simply large in it.
When is PNG the right choice? Screenshots, diagrams, logos, and anything with sharp text or lines — and when a system specifically requires a .png file.