How to use JPG to PNG
- 1Drop in one JPG, or up to 50 to convert as a batch
- 2The output is PNG — nothing else to choose
- 3Every pixel from the JPG is preserved exactly
- 4Expect a larger file than you started with
- 5Download the PNG, or the batch as a ZIP
What JPG to PNG does
This conversion is worth being honest about, because it is the one people most often expect too much from. JPEG discards data permanently when the file is created. Converting to PNG afterwards preserves whatever survived, exactly — but it cannot rebuild what was thrown away. A soft, blocky JPG becomes a soft, blocky PNG.
What you do gain is a starting point that will not degrade further. Every save of a JPEG re-compresses it, so an image edited and saved repeatedly loses a little more each time. As a PNG it can be cropped, annotated and re-saved indefinitely with no further loss — which is the real reason to make this conversion.
When to use it
- Before editing an image repeatedly
- Each JPEG save compounds compression damage. Converting to PNG first means the working copy stays exactly as it is through however many rounds of edits.
- Adding transparency to a photo
- JPEG has no alpha channel, so a background cannot be removed while the file stays JPG. Converting to PNG first gives somewhere for the transparency to live.
- Meeting a PNG-only requirement
- Some upload forms, app stores and design tools accept PNG and nothing else, regardless of what the image actually contains.
- Placing an image in a document
- Some layout and presentation software handles PNG more predictably, particularly around scaling and colour, than it handles JPEG.
JPG to PNG settings explained
- Output format
- Fixed to PNG. There is no quality setting because PNG is lossless — every pixel the JPEG decoded to is stored exactly as it is.
- Batch conversion
- Up to 50 files, 100 MB each, 300 MB in total, converted with the same settings and delivered as one ZIP.
- Transparency
- The PNG will have an alpha channel available, but the image itself will be fully opaque — a JPEG has no transparency to carry across. The channel is somewhere to put transparency you add later.
- Existing artefacts are preserved
- JPEG compression artefacts — blocking, ringing around edges — become part of the PNG's exact pixel data. Lossless means preserving the flaws as faithfully as everything else.
What this conversion does and does not do
| Question | Answer |
|---|---|
| Does it restore lost detail? | No — the data is gone |
| Does it prevent further loss? | Yes, from this point on |
| Does it add transparency? | It adds the channel, not the transparency |
| Will the file be smaller? | No, usually several times larger |
Limits and what to expect
- PNG files of photographs are typically several times larger than the JPG they came from.
- JPEG compression artefacts are preserved exactly rather than removed.
- No quality improvement is possible — this only stops further degradation.
- 50 files per batch, 100 MB each, 300 MB per queue.
- Images beyond roughly 100 megapixels are refused, because an oversized browser canvas renders blank.
Troubleshooting
- The PNG is much bigger than the JPG
- That is expected and unavoidable. JPEG achieves its size by discarding data; PNG stores every pixel it is given, including all the photographic noise. For a photograph the PNG is commonly several times larger.
- The image still looks blocky
- Those artefacts were baked into the JPEG when it was created, and lossless conversion preserves them faithfully. Nothing can remove them, because the original detail no longer exists in the file.
- The background is still not transparent
- Converting adds an alpha channel but not transparency itself — a JPEG has no transparency to carry over. Use the background remover on the PNG to actually cut the subject out.
- I wanted a smaller file
- Then this is the wrong direction. Compress the JPG, or convert it to WebP, which is smaller than JPG at the same quality and still supports transparency.
Your files and your privacy
The JPEG is decoded and re-encoded as PNG on a canvas inside your browser tab. No image is uploaded, and batch ZIPs are built locally too. The tool works with the network disconnected once the page has loaded.
What to use next
FAQ
Does converting JPG to PNG improve quality?
No. JPEG discards data permanently when the file is created, and converting afterwards preserves exactly what survived — including every artefact. What it does give you is a copy that will not degrade further, however many times you edit and save it.
Why is the PNG so much larger?
JPEG gets its small size by throwing data away; PNG stores every pixel it receives. For a photograph, which is full of fine variation, that commonly means a file several times bigger. It is the price of losslessness, not a fault.
Will converting give my image a transparent background?
It gives the file an alpha channel, but the image stays fully opaque — there is no transparency in a JPEG to carry across. To actually remove a background, convert first and then use the background remover on the PNG.
When should I make this conversion?
Before editing an image you will save several times, since every JPEG save compounds compression damage. Also when something specifically requires PNG, or when you are about to add transparency.
Can I convert several files at once?
Yes, up to 50 within 300 MB. They convert with the same settings and download together as a single ZIP.
Are my images uploaded?
No. The conversion happens on a canvas in your browser, on your own device, with no request to any server.