What changes when you convert JPG to PNG
JPEG stores an approximation of an image. Its encoder discards detail the eye is unlikely to miss, which is why photographs compress so well — and why every re-save degrades the picture a little further.
PNG stores the image exactly. Converting a JPG to PNG does not repair anything that JPEG already threw away, but it does stop the bleeding: from that point on you can crop, retouch and re-save as many times as you like without adding a single new artefact. That is the main reason to make the switch.
Why convert JPG to PNG?
- Editing without generation loss. Every JPEG save re-compresses the whole image. Work in PNG and repeated saves cost you nothing.
- You need transparency. JPEG cannot store an alpha channel at all. Convert to PNG first, then erase the background in your editor.
- Upload requirements. Some form builders, print templates and app stores specify PNG for logos, icons and screenshots.
- Sharper overlays. Text, watermarks and UI elements pasted onto a JPEG pick up ringing artefacts; the same work saved as PNG stays crisp.
- Documents and presentations. PNG avoids the visible block artefacts that show up when a JPEG is scaled inside a slide or PDF.
How to convert JPG to PNG
-
Add your images
Drag one or more JPG files onto the drop area at the top of this page, or press Choose JPG files to pick them from your device. Each file appears in the list with a preview, its original name, pixel dimensions and file size.
-
Convert
Press Convert to PNG. Your browser decodes each image, draws it to an HTML5 canvas and re-encodes it. Files are handled one at a time so the page stays responsive.
-
Download
Press Download PNG next to any finished image, or Download all as ZIP to grab everything at once. Filenames keep their original stem, with the extension changed.
Honest expectations
Converting to PNG does not improve the image. Compression artefacts already present in the JPEG — blockiness in flat areas, halos along high-contrast edges — are copied faithfully into the PNG. Nothing can recover the original detail, because it was discarded when the JPEG was first written.
Expect a much larger file. A 500 KB JPEG photograph commonly becomes a 3–5 MB PNG. That is the cost of lossless storage on photographic content, not a fault in the conversion. Convert for editing and archiving, not to save space.
The PNG produced here is fully opaque, because the JPEG it came from had no transparency to carry over. You can erase areas to transparent afterwards in any image editor.
Privacy: nothing is uploaded
Most online converters send your file to a server, process it there and hand back a download link. This one does not. The page is a static site with no backend and no upload endpoint — your images are read from disk by the browser, decoded by the browser and re-encoded by the browser. They stay on your device.
A practical consequence: the tool keeps working offline once the page has loaded, and it is safe for images you would not want to hand to a third party. If you would like to verify the claim yourself, open your browser's developer tools, switch to the Network tab and run a conversion — you will see no request carrying your image. Read the full privacy policy for details on advertising cookies.
Frequently asked questions
How do I convert JPG to PNG?
Drop your JPG or JPEG files onto the area at the top of this page, press Convert to PNG, then download the results individually or as a ZIP.
Does converting JPG to PNG improve quality?
No. The conversion is lossless, but it cannot restore detail the JPEG encoder already discarded. Existing artefacts are preserved exactly. What it does give you is a format that will not degrade further with each save.
Why is the PNG so much bigger than the JPG?
PNG is lossless, so it stores every pixel of a noisy photograph exactly, while JPEG stores a compact approximation. Growth of five to ten times is normal for photographic content.
Does the PNG have a transparent background?
No. JPEG has no alpha channel, so there is no transparency to carry across and the result is fully opaque. You can erase parts to transparent afterwards in an image editor.
Can I convert multiple JPG files at once?
Yes. Add as many as you like, convert in one pass, and use Download all as ZIP for a single archive.
Does it work with .jpeg and .jfif files?
Yes. Those are the same format with different extensions, and all of them are accepted.
Are my photos uploaded to a server?
No. Conversion happens entirely in your browser. The site is static, with no backend and no upload endpoint, so your images never leave your device.
Is there a limit on image size?
There is no fixed file-size limit, but conversion is bounded by your device's memory and your browser's maximum canvas size. Images wider or taller than 16,384 pixels may fail — mobile Safari is the strictest here. The tool tells you when an image exceeds what your browser can handle.
Can I use this converter on mobile?
Yes. The page is responsive and works in mobile Chrome, Safari, Firefox and Edge. Very large images may fail on phones because of tighter memory limits.