What happens to transparency in a PNG to JPG conversion?
JPG has no transparency. Empty areas fill with white, or with a color you pick, so a form does not turn them black or into a checkerboard. A PNG that is already opaque is only re-encoded.
Turn a PNG into a JPG when a form, an ID photo, or a chat app cannot keep transparency. Transparent areas fill with white, or with a color you choose.
Processed locally, never uploaded
JPG has no transparency. Empty areas fill with white, or with a color you pick, so a form does not turn them black or into a checkerboard. A PNG that is already opaque is only re-encoded.
Yes. The size option uses the same path as the compress page: JPEG quality comes down first, then the long edge, until the file fits. Several files wait in a queue. Download one, or zip them.
That is what it is for. Many forms want a JPG, often on white or a set background. Drop the transparent PNG, choose the color, and download. A transparent PNG that WhatsApp will not send as a photo can be turned into a JPG first.
No. Conversion uses the browser on this device. The file is not uploaded. The other way, JPG to PNG, is JPG to PNG.