Why convert JPG to PNG?
Some software and forms require PNG, and editing in PNG avoids adding a new round of JPEG artefacts every time you save. Converting a JPG to PNG preserves exactly what the JPG contains. It does not restore detail the JPEG compression removed, and the file will usually be larger.
What it will not do
It will not make the background transparent; a JPG has no transparency to carry over. For a transparent logo or cut-out, use the logo background remover or the background remover, which export PNG.
File size
Expect the PNG to be larger than the JPG, sometimes several times larger for photos. OxiPNG compresses it losslessly as far as possible.
For printing
Print shops accept high-quality JPEGs; converting to PNG does not improve print quality. Send the original JPG at full resolution unless PNG is specifically required.
JPG and PNG compared
| Feature | JPG | PNG |
|---|---|---|
| Compression | Lossy | Lossless |
| Re-saving adds artefacts | Yes, each time | No |
| Transparency | No | Yes (but none to carry over) |
| Photo file size | Small | Large |
Step by step
- Add your JPG files: choose them, drag them onto the page, or paste.
- There is no quality setting: the output is lossless.
- Click Convert to PNG.
- Download each file, or all of them as a ZIP. File names stay the same with the new extension.
Without this tool
Open the JPG in Paint (Windows) and use Save as → PNG, or in Preview (Mac) use File → Export → PNG. The result is the same as here: the decoded pixels saved losslessly.
Troubleshooting
- A file shows an error. It may not really be JPG: files are sometimes renamed without being converted. The tool reads the file's contents, not its name, and says what it found.
- The converted file is larger. That is expected when going to a less efficient or lossless format; it is not a fault.
- Colours shift slightly. Wide-gamut originals are converted to standard sRGB, which every screen shows consistently.
Editing workflows
If you will edit an image repeatedly, such as adding text, annotating or cropping in several passes, working in PNG avoids the generation loss you get from saving a JPEG over and over. Convert once to PNG, do your edits, and export a final JPG at the end if a smaller file is needed.
Batch conversion
Add up to ten JPGs free (500 with the batch licence) and download them as PNGs in a ZIP.
Printing and documents
Word processors and presentation apps accept both formats. PNG avoids extra artefacts if the app re-compresses images on save, which some do, but it makes the document file larger.
Private by design
The image never leaves your device. It is decoded in your browser, processed in a background worker by open-source codecs compiled to WebAssembly (MozJPEG, libwebp, libavif and OxiPNG, via the jsquash project, plus pica for resizing) and handed back as a download. There is no upload, no account and no server copy to delete. You can confirm it in your browser's developer tools: the Network tab shows the page's own files and the codec files loading, and nothing carrying your image. After the first visit the tools work offline.