Picture Batch JPG to PNG
JPG to PNG
This conversion is worth doing for one reason: PNG is lossless, so from this point on the image stops degrading every time it is saved. It will not undo what the JPEG already discarded, and the file will get considerably larger. Both of those are properties of the formats rather than of this tool.
Drop JPEG images here
JPEG files — or any of PNG, WebP, AVIF, BMP, ICO, TIFF, GIF or camera raw (CR2, CR3, NEF, ARW, DNG, RAF, ORF, RW2). Everything runs on this device.
Your images never leave this device. They are decoded and re-encoded by your own browser, and the security policy on every page blocks this site from sending them anywhere.
Lossless, keeps transparency, universally supported, larger than modern formats.
PNG is lossless — it stores every pixel exactly, so there is nothing to trade away.
Images keep their original dimensions.
Kept. PNG stores a full alpha channel, so cut-outs and soft edges come through exactly.
Exif is carried across where both formats can hold it. Nothing currently in the queue has any.
Exif metadata can be carried from JPEG to PNG. Colour profiles are not, because decoding converts the image to sRGB.
What happens to your image
Expect the file to get larger, often several times larger. PNG is lossless, so it has to store the JPEG or WebP compression artefacts as though they were real detail — which, to a lossless encoder, they are.
| Property | Outcome |
|---|---|
| Transparency | Preserved: JPEG images have no transparency to lose. |
| Image quality | Preserved: Nothing further is lost. PNG is lossless, so it stores exactly what the JPEG decoded to — including the compression artefacts the JPEG already had. |
| Colour | Partly preserved: Converted to sRGB. Decoding an image colour-manages it into the browser's own space, so the output is sRGB and is left untagged, which every viewer reads as sRGB. A wide-gamut source is reported before conversion. |
| Exif metadata | Preserved: Carried across if you leave metadata switched on, or removed completely if you switch it off. Camera, date and any location tag travel together. |
| Orientation | Preserved: Applied to the pixels, and the tag is reset to upright afterwards so nothing rotates the image a second time. |
What this does and does not fix
It does stop further loss. If the image is about to be edited, annotated, cropped and re-saved several times, doing that as PNG means the tenth save looks like the first, where a chain of JPEG saves would visibly deteriorate.
It does not remove the artefacts already there. The blocking, the ringing around edges, the mottling in smooth skies — those are part of the picture now, and a lossless format stores them as faithfully as it stores everything else. Anyone offering to "restore" a JPEG by converting it to PNG is selling something.
Expect a much larger file
A 2 MB JPEG photograph commonly becomes a 15 to 20 MB PNG. The JPEG achieved its size by throwing away detail; PNG cannot do that, and worse, the fine noise that lossy compression leaves behind is exactly the kind of data lossless compression struggles with.
If the size is a problem and you only need to stop further loss, WebP in lossless mode is a better answer than PNG for many images.
Metadata and rotation come across properly
Exif from the JPEG is carried into the PNG as an eXIf chunk when metadata is left switched on — camera, date, and anything else it holds — or removed completely when it is switched off.
The rotation is applied to the pixels either way, and the orientation tag is reset to upright afterwards. A photograph that was stored sideways with a tag comes out genuinely upright, which is what stops it appearing rotated in one program and correct in another.
If something goes wrong
The PNG is ten times the size of the JPG.
Expected, and explained above.
What to do: If you need lossless and small, try WebP. If you need small and lossless is not essential, keep the JPEG.
The image still shows JPEG artefacts.
They are in the pixels. No conversion removes them.
What to do: Only re-exporting from the original source will. If there is no original, the artefacts are permanent.
Questions
Does converting JPG to PNG improve quality?
No. It prevents further loss from future saves, which is a genuinely useful thing, but the detail the JPEG discarded cannot be recovered by any means.
Does PNG support transparency I can add later?
Yes. The converted PNG has an alpha channel, so you can erase a background in an editor afterwards and it will stay transparent — something a JPEG can never do.