Check whether your PNG really contains transparency
Identify the source
A JPEG cannot contain transparent pixels. PNG and WebP may contain transparency, but not every file in those formats does. Before converting, identify whether your source has a real transparent area or an opaque white or checkerboard background.
Convert one small example
Choose the file and prepare the PNG. The pixel dimensions are preserved. Download the result and open it in a viewer or editor that lets you change the background beneath the image. Avoid relying on a white webpage preview alone because it can hide the difference between white and transparent.
Check two backgrounds
Place the result over a dark color and then a light color. Transparent areas reveal the background; opaque white areas remain white. Partially transparent edges blend with the background. A checkerboard that remains visible in the artwork has been painted into the source image.
Keep realistic expectations
Converting JPEG to PNG does not recover JPEG compression detail, remove a background or make a raster file into a vector. A photographic PNG can be much larger than the original. Decide from the receiving application’s requirements and the saved result, not from the file extension alone.
Use the browser limits
Work with still images within the source and selection limits. Animated inputs are not preserved as animation. Keep the original file if you need its metadata, source layers or a different future export. For sensitive images, remember that the tool runs locally, while downloading a result saves a copy on your device.
Try and verify the workflow
A transparent WebP can become a PNG without adding a solid background. A JPEG will remain opaque because it has no transparent pixels to preserve.
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