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 rather than 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, with no quality setting because PNG is lossless
- Check the size comparison, which will normally show a larger file
- Save individually or all at once
How JPG to PNG Converter Works
What the conversion actually does
JPEG decoded to pixels (already carrying its compression artifacts) → pixels drawn unchanged at the same size → written out as PNG, which stores every pixel exactly
- lossless from here on
- PNG adds no further loss, so editing and re-saving the PNG will not degrade it the way repeated JPEG saves do. It cannot restore detail the JPEG already discarded.
- no quality slider
- PNG encoding has no lossy setting, so there is nothing to choose.
- transparency
- A JPEG has none, so the PNG comes out fully opaque. Removing a background is a separate step.
Worked example
A 1200 × 800 JPEG product photo
- Decoded to 1200 × 800 = 960,000 pixels, each with its JPEG artifacts intact
- Drawn onto a 1200 × 800 canvas with no scaling
- Encoded as image/png
Result: A 1200 × 800 PNG that looks identical to the JPEG and is usually several times larger, because PNG stores exactly what JPEG compression approximated.
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 color 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 WebP in lossless mode rather than PNG: it 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.
- Color profiles are not carried across; the result is treated as sRGB.
- PNG output is a browser encode rather than an optimizer, 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?
No, and this is the single most common misunderstanding about the conversion. PNG is lossless, which means it will not discard anything further; it cannot recover what the JPG already threw away. The compression artifacts in the JPG are copied into the PNG perfectly. What you gain is a file that will not degrade with each subsequent save.
Will this give my JPG a transparent background?
No. PNG can store transparency; converting to PNG does not create any. Your JPG has an opaque pixel everywhere, and every one of them stays opaque. Removing a background is a separate editing job that has to decide which pixels to erase.
Why is the PNG so much larger than the JPG?
Because PNG keeps every pixel exactly and finds savings only in repetition, while JPG discards detail your eye is bad at noticing. Photographs are full of noise and gradients with very little repetition, so three to six times larger is typical, and ten times is not unusual for a large photo.
When is converting to PNG the right move?
When the image is going into further editing and you want no more generational loss; when a tool or platform accepts only PNG; or when you are about to add transparency, text or overlays and need a format that will hold sharp edges. For a file you are simply sending or publishing, the JPG is usually the better choice.
Is anything uploaded?
No. The conversion runs in the page. This site is a static export with no backend, so there is no server to receive a file.
Does this improve the image?
No. PNG stores the JPEG's already-compressed pixels losslessly, so nothing is recovered and the file gets substantially larger. Converting for quality reasons is a misunderstanding of what lossless means.
When is this conversion genuinely useful?
When you need to edit without further generational loss, when a system or platform requires PNG, or when you are about to add transparency. Those are real reasons; "PNG is higher quality" is not.
Will it add a transparent background?
No. The JPEG has no transparency to restore, so the background comes across as the solid pixels it already was. Removing a background is a separate operation.
Why is the PNG so much bigger?
Because lossless compression cannot exploit the perceptual shortcuts JPEG uses, and photographic noise compresses badly. A several-fold size increase for a photograph is normal.
Is my image uploaded?
No. The conversion runs in your browser.
Will JPEG artefacts disappear?
No. Compression artefacts are part of the image data now and are preserved exactly. PNG records them faithfully rather than removing them.
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