jpg → png
JPG to PNG, when nothing else is accepted
Occasionally a piece of software or an upload form will take PNG and only PNG. This handles that without your photograph going anywhere.
Processed on your own hardware · never transmitted, never stored
What happens when you drop a file in
The file stays put. Your browser opens it the same way an image viewer would. There is no transfer, which is why there is no upload bar to watch.
An encoder arrives once. The first job on this site pulls down a compiled build of FFmpeg, roughly 30 MB. It is kept afterwards, so every job after the first starts immediately.
Your own hardware does the job. The work happens in this tab, on your processor. A laptop from the last few years handles short clips in well under real time.
The result lands in Downloads. Assembled in memory and handed straight to your browser. Close the tab and every trace of it is gone.
What this conversion can and cannot do
Moving to PNG makes the file lossless from this moment forward. It does not reverse anything the JPEG already did — whatever was discarded when the photograph was first saved has been gone ever since, and changing the container does not retrieve it.
So the honest justification is compatibility rather than quality. Certain forms accept PNG exclusively. Certain software refuses JPEG outright. Certain workflows need something that will not decay through repeated saving.
That final case is the genuinely valuable one. A JPEG loses a little more every time it is opened, altered and saved again. Switching to PNG halts that erosion permanently.
The file will get considerably larger
Expect three to five times the size of the JPEG you started with. PNG records every pixel exactly, and a photograph offers it almost no repetition to exploit. That is the price of losslessness and there is no clever way around it — if size mattered more than format, the JPEG was already the better file.
Common questions
Will the photo improve?
No. What the JPEG discarded is gone. PNG keeps what remains without enhancing it.
Why is it so much bigger?
PNG stores each pixel precisely, and photographs contain little repetition for it to compress.
Does it gain transparency?
No. There was none to begin with; it simply becomes a PNG with an opaque background.
Is anything transmitted?
No, it runs entirely in this tab.