JPG to PNG Converter

JPG vs PNG in one table

Why “JPG to PNG” does not gain quality

Converting a JPG to PNG does not undo JPEG compression. The artefacts (blockiness, mosquito noise around edges) are already baked into the pixels. The conversion simply stores those exact pixels in a lossless container — no better, no worse.

What it does avoid is further degradation. If you expect to edit and re-save the image multiple times, converting to PNG once and editing from there prevents generational quality loss.

Adding transparency

The converter can key out a solid colour (typically white) and make it transparent in the PNG output. This works only for cleanly solid backgrounds:

• Good: a logo on a pure white background.
• Bad: a product photo with soft shadows or anti-aliased edges — the “white” pixels at the edges are actually slightly off-white, and keying them creates a jagged halo.

For proper background removal on photographs, use a dedicated background-remover tool.

File size expectations

A typical 12 MP smartphone JPG is 2-4 MB. The same image as PNG is 15-25 MB. Pre-compress your source if size matters:

• Downscale before converting.
• Use PNG compression level 9 (slower, but ~20% smaller than level 6).
• Strip metadata — a rarely-used option but shaves 1-5% off.

Common mistakes

• Converting to PNG to “improve quality”. PNG cannot recover what JPEG lost. Start from the original lossless source if you have it.
• Publishing PNG photos on the web. Use JPEG, WebP or AVIF for photos. PNG for photos wastes bandwidth.
• Expecting smaller output. PNG of a JPG is always larger, never smaller, because it is preserving more information.
• Keying transparency on an already-edited JPG. JPG compression shifts pixel values subtly, so the “white” you see is not pure white. Transparency keying will miss pixels and leave fringes.