Because it runs in the browser, nothing is uploaded and there is no queue to wait in.
Why convert JPG to PNG
PNG uses lossless compression, so once your image is a PNG, further edits and re-saves will not add the blocky artifacts that repeated JPG saving introduces.
PNG also supports a real alpha channel. Converting first gives you a format that can hold transparency when you later cut out a background.
How to use it
Pick the JPG file you want to change. The tool decodes it, draws it onto a canvas and encodes a PNG that keeps the original dimensions and colors.
Download the PNG when it appears. If you need a lighter file, the compressor is one click away.
Editing after conversion
A PNG is the friendlier base for retouching. You can erase a background, layer the image over other artwork, or add a logo without stacking new compression on top.
When the work is done and you want the smallest possible file for the web, convert the finished PNG to JPG or WebP as a final export step.
Frequently asked questions
Will the PNG look better than the JPG?
It will not add detail that the JPG lost, but it stops further quality loss during future edits and saves.
Does the PNG have a transparent background?
The converted image keeps the solid background of the JPG. PNG can store transparency, so you can erase the background afterward in an editor.
Is there a file size limit?
The only limit is your device memory, since everything is processed locally. Very large images simply take a little longer.
Why is the PNG bigger than the JPG?
PNG is lossless, so it stores more data than a compressed JPG. That is the trade for cleaner editing and transparency support.