Does converting to PNG improve the quality?

No. The detail JPG dropped during compression is no longer in the file, and changing format can't put it back. Converting to PNG means "no further loss from here", not "recover what was lost". If you need higher quality, the only route is the original file.

Why did the file get bigger?

Because PNG is lossless. JPG is small precisely because it throws away detail your eye is unlikely to miss; PNG throws away nothing, so photos converted to PNG are commonly several times larger. That's expected, not a fault in the conversion.

When is this worth doing, and when isn't it?

Worth it: more rounds of editing and saving are coming, you need a transparent background, or the recipient only takes PNG. Not worth it: a photo you just want to store or send — you'd multiply the size for no quality gain at all. (Screenshots and line art are smaller and cleaner as PNG, but only when saved as PNG from the start; a screenshot that's already a JPG keeps its compression noise after converting.)

Are my images uploaded to a server?

No. Decoding, conversion and encoding all happen in your browser. You can verify it: open the network panel in developer tools and convert — no request carrying image data appears.

JPG to PNG: lossless from here on — but it can't undo what JPG already threw away

Drop it in and it's converted. There's nothing to adjust — PNG is lossless, so there are no settings to offer.

or start a blank document

People usually convert to PNG for one of two reasons: more editing and re-saving is coming (PNG is lossless, so nothing accumulates), or whoever is receiving it only accepts PNG.

One thing up front: converting to PNG does not improve quality. The detail JPG discarded during compression is gone; a different container can't bring it back. What you see is still that JPG — it just stops degrading from now on. Any claim that "converting to PNG improves quality" is simply false.

Key features

No settings, because there genuinely aren't any

PNG is lossless — the quality argument to `toBlob` does nothing for it. Other tools put a quality slider here anyway, which only makes people think they adjusted something. We don't.

No more generation loss

Every JPG save re-compresses; five edits stack five layers of loss. Once it's a PNG, saving no longer adds any loss — pixels you haven't changed stay exactly the same however many times you save.

Nothing uploaded, no limit on how many

Conversion finishes inside your browser; not one byte of the image goes out. Drop a dozen at once and it switches to batch mode.

No sign-up, no watermark

Open it and use it. Nothing is stamped onto the result.

How to use

1
Drop your JPG in

Drag, click to pick, or paste with Ctrl+V. Several at once turns into batch mode automatically.
2
That's it

Nothing to configure. The result appears on the right and the download button shows its size.
3
Glance at the size

Usually the PNG is larger than the JPG was — that's the price of lossless, not a mistake.
4
Download

Save as .png, or carry it into the pro editor in one click.

FAQ

Does converting to PNG improve the quality?: No. The detail JPG dropped during compression is no longer in the file, and changing format can't put it back. Converting to PNG means "no further loss from here", not "recover what was lost". If you need higher quality, the only route is the original file.
Why did the file get bigger?: Because PNG is lossless. JPG is small precisely because it throws away detail your eye is unlikely to miss; PNG throws away nothing, so photos converted to PNG are commonly several times larger. That's expected, not a fault in the conversion.
When is this worth doing, and when isn't it?: Worth it: more rounds of editing and saving are coming, you need a transparent background, or the recipient only takes PNG. Not worth it: a photo you just want to store or send — you'd multiply the size for no quality gain at all. (Screenshots and line art are smaller and cleaner as PNG, but only when saved as PNG from the start; a screenshot that's already a JPG keeps its compression noise after converting.)
Are my images uploaded to a server?: No. Decoding, conversion and encoding all happen in your browser. You can verify it: open the network panel in developer tools and convert — no request carrying image data appears.

Try JPG to PNG: lossless from here on — but it can't undo what JPG already threw away now

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