JPG to PNG
Convert JPG images to PNG — lossless and supports transparency, best for screenshots and logos.
- Your files never leave your device
- Free, no sign-up
- No watermark, no file limit
About this tool
Converting a JPG to PNG is worth doing when you need a lossless copy to edit, or when something insists on PNG. It is worth knowing before you start that the file will almost certainly get bigger — often two to five times — because PNG stores every pixel exactly instead of compressing them away.
Your images never leave your device. Each file is decoded by your browser, drawn to a canvas and re-encoded in the new format in memory. Nothing is uploaded, which matters when the image is an ID document, a signature or a private photograph.
How to use this tool
- Add one or more JPG images.
- Optionally set a longest-side limit to reduce the dimensions at the same time.
- Press Convert to PNG.
- Check the reported size change before you download — PNG is usually larger.
What the JPG to PNG does
JPG throws away detail to make files small, and does it again every time you re-save. PNG never does: it is lossless, so what goes in comes out. Converting JPG to PNG does not recover the detail the JPG already lost — that is gone for good — but it stops any further loss, which matters if the image is about to be edited and re-saved several times.
PNG also supports transparency, so a converted image can have areas erased afterwards in an editor. The conversion itself does not create transparency; it just makes it possible.
What actually happens
1. The browser decodes the JPG into pixels.
2. Those pixels are drawn to a canvas.
3. The canvas is encoded as PNG — losslessly.
Detail the JPG already discarded is not recovered.
A PNG made from a JPG is a perfect copy of an imperfect image.
Typical size change for a photograph:
2 MB JPG → 6–10 MB PNG
Worked example
Example: a photograph
| Input | 3000 × 2000 JPG, 1.8 MB |
| Output | 3000 × 2000 PNG, about 8 MB |
| Visible difference | none |
Four times the size for no visible gain. That is the correct outcome, and the reason to convert a photograph to PNG only when something specifically requires it.
What your result means
A larger file is expected here, not a fault. PNG is lossless.
Quality is unchanged — the conversion adds no loss of its own.
If you wanted a smaller file, you want JPG to WebP instead.
Things to watch out for
- Only convert photographs to PNG when a system demands it. For everything else the JPG is the better file.
- PNG is the right format for screenshots, logos, diagrams, and any image with sharp edges or flat colour.
- Converting JPG to PNG does not undo JPG compression artefacts. They are baked into the pixels.
- If you need transparency, you still have to erase the background in an image editor afterwards.
- For upload limits, use the KB optimiser, which targets a file size directly.
Limitations of this tool
- JPG detail already lost cannot be recovered — no tool can do that.
- Images are capped at 8000 px on the longest side.
- Animated formats are not supported; a single frame is produced.
- EXIF metadata, including camera details and GPS location, is not carried across — which is usually a benefit.
Frequently asked questions
Why is my PNG bigger than the JPG?
Because PNG is lossless and JPG is not. PNG stores every pixel exactly, which for a photograph means several times the size. It is the expected result, not an error.
Does converting to PNG improve quality?
No. It prevents further loss, but the detail the JPG already discarded is gone permanently. A PNG made from a JPG is an exact copy of a lossy image.
Will my JPG become transparent?
No. JPG has no transparency to carry across. The PNG supports it, so you can erase areas afterwards in an editor.
Can I convert several at once?
Yes. Add as many as you like and they come back as a single ZIP.