Does Converting JPG to PNG Improve Quality? What Really Happens
Converting JPG to PNG never restores lost detail, but it stops further loss and makes files several times bigger. When the switch helps and when it hurts.
The short answer
No. Converting a JPG to PNG does not improve its quality. JPEG compression throws detail away when the photo is first saved, and nothing in the conversion can bring it back. What the PNG does give you is a lossless copy: it keeps the image exactly as it is now and will not lose more detail when you edit and re-save it. The trade-off is size, because a photo saved as PNG is usually several times larger. You can make the switch in the browser with the JPG to PNG converter.
Why quality cannot go up
A JPG is stored using lossy compression. When a camera or app saves a JPG, it simplifies fine texture and colour detail that the eye is less likely to notice. Blocky patches in flat areas, halos around sharp edges and smeared fine detail are the visible results, especially at low quality settings.
When you convert that JPG to PNG, the converter first decodes the JPG into pixels, then stores those exact pixels losslessly. The PNG is a perfect copy of the damaged picture, artefacts included. Think of it as photocopying a photocopy on a perfect machine: the copy is not worse, but it is not better either.
The pixel dimensions do not change. A 1200 × 800 JPG becomes a 1200 × 800 PNG. If you need a sharper or larger picture, you need the original file from the camera or a higher-resolution source.
Why the PNG file is so much bigger
PNG's lossless compression works well on flat colours, text and simple graphics, but photographs are full of fine, slightly random variation that it cannot squeeze much.
We tested this in Chrome using the same canvas method the converter uses. A 1200 × 800 test photo saved as a 359 KB JPG became a 2.38 MB PNG, about 6.6 times larger. Re-encoding the same pixels as JPG at the converter's 0.92 quality setting gave about 409 KB. Our test image was deliberately noisy, so your own photos may grow by less, but expect the PNG to be several times the size of the JPG.
That matters for:
- Upload limits on forms, job portals and email.
- Website speed, because larger images take longer to load. See how to compress images for the web.
- Storage, if you convert a whole photo library.
When converting JPG to PNG is worth it
| Situation | Convert to PNG? | Why |
|---|---|---|
| You will edit and re-save the image many times | Yes | Each JPG save loses a little more. A PNG working copy does not. |
| A site or app only accepts PNG | Yes | The format requirement is the reason. |
| Screenshot, chart or text saved as JPG by mistake | Yes, as a working copy | Stops further damage. The existing blur stays. |
| You want a sharper photo | No | Conversion cannot add detail. |
| You want a smaller file | No | PNG photos are usually much larger. Compress the JPG instead. |
| You need a transparent background | Not by itself | The converted PNG is fully opaque. See below. |
What about transparency?
A JPG cannot store transparency, so every pixel in it is opaque. Converting to PNG gives you a format that can hold transparency, but the converted image is still completely opaque, including any white or coloured background. To actually remove the background you need a background removal step, such as Remove Background, which outputs a PNG with transparent areas.
How to convert JPG to PNG without adding more loss
The converter also accepts other formats your browser can open, such as WebP, and it can decode iPhone HEIC files, so the same steps work for those.
What gets removed during conversion
The browser re-draws the pixels onto a new canvas, so the PNG contains only the image itself. Camera metadata stored in the JPG, such as EXIF date, camera model and GPS location, is not copied into the PNG. That is useful for privacy. If you need to see what a photo contains before sharing, check it with the Photo Metadata Viewer.
Common mistakes
- Converting to "fix" a blurry or pixelated photo. The blur is in the pixels. Find a better original.
- Converting to make a file smaller. It nearly always does the opposite. To shrink a photo, use Compress Image or reduce its dimensions.
- Converting every photo in a website to PNG. Pages get heavier and slower with no visible gain.
- Converting back and forth. JPG to PNG to JPG to PNG adds a new round of JPEG loss every time you return to JPG.
JPG vs PNG in one line each
- JPG: best for photos you want to share or publish at a small size.
- PNG: best for screenshots, logos, text, graphics with flat colour, images that need transparency, and lossless working copies.
For a longer comparison of the two formats, read PNG vs JPG: when to use each.
Frequently asked questions
Does converting JPG to PNG improve image quality?
No. The PNG is an exact copy of the decoded JPG, including any compression artefacts. It stops further loss when you edit and re-save, but it cannot restore detail that JPEG compression already removed.
Why is my PNG so much bigger than the JPG?
PNG is lossless and photos contain fine variation that lossless compression cannot shrink much. In our Chrome test a 359 KB JPG photo became a 2.38 MB PNG, about 6.6 times larger.
Will converting JPG to PNG make the background transparent?
No. A JPG has no transparent pixels, so the converted PNG is fully opaque. Use a background remover to create transparent areas.
Does the converter keep EXIF and GPS data?
No. The image is redrawn on a browser canvas and saved as a new PNG, so camera metadata such as date, camera model and GPS location is not copied.
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