JPG → PNG
JPG to PNG converter
Drop a JPG and get back a PNG holding exactly the pixels inside it. Decoding happens locally in this tab, so a photograph you would not hand to a stranger is never transmitted.
The JPEG artefacts are now stored exactly as they are: nothing is recovered, and a PNG of a photograph is usually several times the size of the JPG.
How to convert JPG to PNG
Load the JPG
Drop the file, paste it, or browse for it. Files named .jpeg, .jpe or .jfif are the same format and are accepted too.
Set the output size
Leave the width and height limits at zero to keep the original dimensions, or set one to scale the picture down as it is written.
Save the lossless PNG
Download the lossless copy and open it in the editor, typesetter or pipeline that asked for a file without another compression step.
What a JPG looks like once it is a PNG
JPEG compresses with a discrete cosine transform, discarding detail it judges hard to see; PNG filters each row and deflates the result without dropping anything. The conversion therefore decodes the JPEG back to pixels and stores those pixels exactly — same dimensions, same colours, no further loss and no new artefacts.
What it cannot do is undo the compression that already happened. Blockiness around sharp edges, banding in smooth skies and lost fine texture are baked into the pixels now, and PNG preserves them faithfully. The trade is size: a photograph that fitted in 2 MB as JPG can pass 10 MB as PNG, which makes PNG the wrong final format for photographs and the right intermediate one for editing.
JPG to PNG questions
Why is the PNG so much bigger?
Because PNG cannot throw detail away. Smooth gradients and fine texture are exactly what a JPEG encoder spends its compression budget on, so the same pixels need several times as many bytes in a lossless container. Flat graphics barely grow; photographs can grow tenfold.
Can I make the PNG smaller while converting?
Set a maximum width or height and the picture is scaled down proportionally before it is encoded; both at zero keeps the native dimensions. Halving each side removes about three quarters of the pixels, and that is the only lever that meaningfully shrinks a lossless file.
Will the picture look better as a PNG?
No. The artefacts were created when the JPEG was written, and decoding cannot tell them apart from real detail, so the PNG preserves both equally. What improves is what happens next: edits and re-saves no longer cost another generation of compression.
How big can the JPG be, and where does it go?
Up to 64 MB per file, and each one is handled separately rather than packed into an archive. The conversion runs entirely in this tab, so there is nothing to upload and no account to create, and the tool keeps going once it has loaded even with no connection.