PNG to JPG

1. 1Add one or more PNG images.
2. 2Choose the background colour used where the PNG is transparent — white is the usual choice.
3. 3Set the JPEG quality.
4. 4Download the results.

JPEG has no alpha channel, so transparency has to be resolved before encoding. The canvas is filled with your chosen colour and the PNG is drawn on top, which flattens transparent regions onto that background rather than leaving them black — which is what happens if the fill step is skipped.

For photographic content the size saving is large: a PNG photo converted at quality 85 typically lands at a fifth of the original. For flat graphics, logos and screenshots the saving is smaller and the artefacts more visible, so PNG is often the better format to keep.

Images are decoded by the browser, redrawn on a canvas and re-encoded on your own machine. Nothing is uploaded, so there is no waiting on a queue and no copy of your photos anywhere else.

• Choose a background colour that matches where the image will sit. A logo going onto a grey page looks best flattened onto that grey rather than white.
• Quality 80–90 suits most photographs. Go higher only if you can see a difference.
• Keep screenshots, logos and diagrams as PNG. JPEG blurs sharp edges and saves little on flat graphics.
• Keep the PNG as your master copy, especially if it has transparency you may need later.

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