🏞️ JPG to PNG Converter
Convert JPG to PNG without uploading anything. Honest about what it does and does not do: PNG stops further loss, it cannot undo the loss already in a JPG.
Choose images, or drop them here
JPG in, PNG out. Converted in this tab — the file is never uploaded.
PNG is lossless, so there is no quality setting. Converting a JPG to PNG cannot restore detail the JPG already threw away — it just stops any further loss, usually at several times the file size.
What JPG to PNG Converter Does
Converting JPG to PNG is a conversion whose value is almost always misunderstood. PNG is lossless — but lossless describes what happens from here on, not what happened before. It means the PNG will not discard anything further. It cannot put back what the JPG already threw away.
What you get is a file containing exactly the same visible image, several times larger, with the JPEG compression artefacts now stored perfectly and permanently. The gain is that further saves will not degrade it, which matters if the image is going into an editing pipeline. If it is simply being sent or published, the JPG was already the better file.
The other common expectation is transparency. PNG can store an alpha channel; converting to PNG does not create one. A JPG has an opaque pixel at every position, and every one of them stays opaque. Removing a background is an editing decision about which pixels to erase, not a format conversion.
The size difference has a straightforward cause. JPG discards detail the eye resolves poorly and can reach ten-to-one on a photograph. PNG keeps every pixel and finds savings only in repetition — and a photograph, full of noise and gradients, has very little repetition to find. Three to six times larger is normal.
How to Use JPG to PNG Converter
- Add your JPG files, or drop them onto the box
- Each one is decoded and re-encoded as PNG in the page — there is no quality setting because PNG is lossless
- Check the size comparison, which will normally show a larger file
- Save individually or all at once
What converting to PNG does and does not do
| Expectation | Reality |
|---|---|
| Improves the quality | No. The artefacts already in the JPG are copied across exactly. |
| Adds a transparent background | No. Every pixel in a JPG is opaque and stays opaque. |
| Stops further quality loss | Yes. This is the one real benefit. |
| Makes the file smaller | No. Expect 3–6× larger for a photograph. |
| Increases the resolution | No. The pixel dimensions are unchanged. |
When JPG to PNG is the right move
| Situation | Why PNG |
|---|---|
| The image goes into further editing and re-saving | No generational loss from here on |
| A tool or platform accepts only PNG | Compatibility, not quality |
| You are about to add transparency or overlays | PNG can hold the alpha channel you will create |
| You need a crisp master for screenshots or diagrams | PNG holds sharp edges; JPG softens them |
| You are emailing or publishing it as-is | None — keep the JPG |
How to Read Your Result
There is no quality setting, and that is correct
PNG encoding has no lossy parameter. Every pixel is stored exactly, so there is nothing to trade. Any converter offering a "PNG quality" slider is either reducing the colour palette or mislabelling something else.
A very large output is expected, not a fault
A 2 MB JPG becoming a 9 MB PNG is normal for a photograph. If that is a problem, the answer is not PNG — it is WebP in lossless mode, which keeps every pixel and is substantially smaller.
Limitations & Accuracy Notes
- The JPEG artefacts in the source are preserved exactly. Nothing here repairs them.
- No transparency is created; the output is fully opaque.
- Output is 8 bits per channel, which is what the source JPG holds anyway.
- Colour profiles are not carried across; the result is treated as sRGB.
- PNG output is a browser encode rather than an optimiser, so a dedicated tool such as oxipng will produce a smaller PNG from the same pixels.
Frequently Asked Questions
Does converting JPG to PNG improve the quality?
Will this give my JPG a transparent background?
Why is the PNG so much larger than the JPG?
When is converting to PNG the right move?
Is anything uploaded?
References & Further Reading
- MDN — Image file type and format guide
- MDN — HTMLCanvasElement.toBlob() — The quality argument is ignored for image/png, because PNG is lossless
- Google — WebP Compression Study — Includes lossless WebP, the smaller alternative when you need every pixel kept