Does it add transparency?

No. A JPG has no transparency, so the PNG will have a white (opaque) background.

Is the conversion lossless?

PNG is lossless, but the source JPG is already compressed, so quality cannot improve.

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Convert JPG photos to PNG without uploading them. Add a transparent background later or just keep lossless quality. Free.

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

Does it add transparency?: No. A JPG has no transparency, so the PNG will have a white (opaque) background.
Is the conversion lossless?: PNG is lossless, but the source JPG is already compressed, so quality cannot improve.