Does converting remove transparency?

Yes. JPG has no transparency, so any transparent areas become white.

Will my image be uploaded?

No. The conversion runs on a canvas in your browser, so the file stays on your device.

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Drop an image here, or click to choosePNG, JPG, WebP or GIF — processed in your browser, never uploaded

Does converting remove transparency?: Yes. JPG has no transparency, so any transparent areas become white.
Will my image be uploaded?: No. The conversion runs on a canvas in your browser, so the file stays on your device.