How to Convert JPG to PNG Without Losing More Quality

What the conversion actually does

Converting JPG to PNG changes the container and the compression method, not the content. The decoder reads your JPG, reconstructs the pixel grid as accurately as the format allows, and the encoder writes those exact pixels into a PNG. From that point forward the image is lossless: you can open and re-save it as many times as you like without further degradation.

What conversion cannot do is undo the compression that was already applied. JPEG permanently discards detail when the file is first created. If your source has visible blocking around edges, colour smearing in fine textures, or a soft, mushy quality, PNG will faithfully preserve every one of those flaws at a larger file size. This surprises people who expect a lossless format to mean a better picture.

Legitimate reasons to convert

Despite that caveat, the conversion is genuinely useful in several situations, all of which share a common theme: you are about to do something to the image that would suffer from further lossy compression.

• You are starting an editing session and will save intermediate versions. Working in PNG avoids stacking new JPEG artefacts on top of old ones with each save.
• A design tool, printer, or piece of enterprise software refuses JPG or handles it poorly.
• You plan to cut out the subject and add a transparent background. The JPG itself has no transparency, but PNG is the format that can hold the result.
• You are archiving a specific frame and want to guarantee it will never degrade further.
• You need to overlay the image on varied backgrounds and want crisp edges without recompression halos.

The transparency misunderstanding

This is the single most common confusion around JPG to PNG. PNG supports an alpha channel, which stores per-pixel transparency. JPG does not. Because of that, people often assume that converting a JPG to PNG will make its background transparent.

It will not. A JPG is always a fully opaque rectangle of pixels. Converting it produces a PNG that is also a fully opaque rectangle; the file simply now has the capability to store transparency that it is not using. Making the background actually transparent requires a separate editing step where you select and delete the background, which is image editing rather than format conversion.

Expect a much larger file

A photograph converted from JPG to PNG commonly grows by a factor of five or more. A 1.2 MB JPG can easily become an 8 MB PNG. This is not a bug or a bad setting; it is the arithmetic of lossless compression applied to photographic content where almost no pixel repeats its neighbour.

If your reason for converting was to get a smaller or better file for the web, PNG is the wrong direction entirely. Compress the JPG further, or convert it to WebP, which will usually beat the original JPG on size while keeping comparable quality.

A workflow that avoids the trap

The reliable pattern is to convert at the start of an editing process and never in the middle of a publishing one.

1. Keep the camera original or highest-quality source you have, and do not overwrite it.
2. Convert a copy to PNG when you need a lossless working file for editing.
3. Do all your cropping, retouching, and compositing on that PNG.
4. Export a final JPG or WebP once, at the end, sized for wherever it is going.
5. Publish the exported file, and keep the PNG only if you expect to revise the work later.

Converting privately

The JPG to PNG tool on this site decodes and re-encodes entirely in your browser using the Canvas API, so the image is never sent to a server to be converted. One side effect worth knowing is that re-encoding through a canvas does not carry across the original EXIF metadata, so camera model, timestamps, and any GPS coordinates are dropped from the PNG. If stripping metadata is your actual goal rather than a side effect, the dedicated Remove Image Metadata tool is the clearer choice.