What this converter does
This page reads the JPG you select, decodes it, and re-encodes the pixels as a PNG file. The conversion happens inside your browser tab. The image is not sent to a server, nothing is stored, and the tool keeps working offline once the page has loaded. There is no account to create and no watermark added to the result.
When converting JPG to PNG helps
PNG stores image data in a way that does not degrade each time the file is opened and saved again in an editor. If you plan to open the image in an editing program, make several rounds of changes, and save repeatedly, a PNG working copy avoids stacking up new compression artifacts on every save. JPG re-saves add a fresh round of compression each time, and those artifacts accumulate.
PNG also supports sharp edges and flat colour well. If you are preparing a graphic with text, lines, or solid blocks of colour, a PNG holds those edges cleanly, while JPG tends to produce faint halos around high-contrast boundaries.
What it cannot do
Converting does not bring back detail that the JPG already lost. If the original was heavily compressed, the PNG will faithfully preserve those existing artifacts, blocky areas and all. It will not look sharper or cleaner than the source.
A PNG made from a JPG has no transparent background. JPG does not support transparency, so there is no alpha information to carry over. The converted file is fully opaque. To get transparency you need to remove the background in an editor and save the result as PNG from there.
File size goes up
Expect the PNG to be larger than the JPG, often several times larger. A phone photo that is 2-5 MB as a JPG can become a 10-25 MB PNG, though the exact figure depends on the image content and dimensions. JPG is built for photographs and discards detail the eye is less likely to notice; PNG keeps pixel data in a form that compresses less efficiently on photos.
| Situation | JPG | PNG |
|---|---|---|
| Photographs | Smaller files, good for sharing | Much larger files, no size benefit |
| Repeated editing and saving | Quality drops with each save | No new compression artifacts per save |
| Text, lines, flat colour | Soft edges and halos | Clean, sharp edges |
| Transparency | Not supported | Supported, but not added by converting |
| Web page images | Usually the better choice | Better only for graphics and logos |
Choosing the right format
If the image is a photo and you only need to view or share it, keep the JPG. Converting to PNG gains nothing and multiplies the file size. Convert when you are about to edit the image and want to avoid further quality loss on re-saves, or when you need a format that handles sharp graphics well. If the end goal is a small file for a website, a JPG or WebP is usually the more sensible output, and the PNG step is only worth it as a working copy during editing.
Resolution and dimensions
Converting does not change the pixel dimensions. A 4000 x 3000 JPG becomes a 4000 x 3000 PNG. If you need a smaller image, resize it rather than converting, since a PNG at the same dimensions will be heavier, not lighter.
Questions
Does converting JPG to PNG improve quality?
No. The PNG keeps exactly the pixels the JPG already had, including any compression artifacts. It does not restore detail that was lost when the JPG was created.
Will the PNG have a transparent background?
No. JPG does not store transparency, so there is nothing to convert. The PNG will be fully opaque. You need to remove the background in an editor to get transparency.
Why is the PNG file so much bigger?
PNG keeps pixel data in a form that compresses less efficiently for photographs. A JPG that is a few megabytes can become a PNG many times that size, especially for detailed photos.
Are my images uploaded anywhere?
No. The conversion runs entirely in your browser. The image never leaves your device, nothing is stored, and the tool works offline once the page has loaded.