Convert JPG to PNG without uploading anything
PNG is a lossless container: once your picture is a PNG, saving it again never costs quality. Drop a JPG in and get a PNG back — one file or a whole folder, converted on your own device.
- Nothing is uploaded
- Lossless from here on
- Batch conversion
- Unlimited & free
Drop your images here
or paste from the clipboard · ⌘V / Ctrl+V works too
JPG · JPEG · PNG · WebP · AVIF · HEIC · GIF · BMP — no file count limit
Compression settings
Applied to every imageAuto measures each image: it encodes a test pass at several quality levels, scores the result against the original, and keeps the smallest file that still clears a ~40 dB fidelity floor.
Advanced options
Need exact dimensions or a centre crop instead of a cap? The batch image resizer does that.
Auto applies a halo-free unsharp mask only when an image is scaled below 82%.
Generated in your browser by a synth — no audio file is downloaded, and it stays silent when a batch finishes in a couple of seconds.
WASM codecs are fetched from a public CDN on first use and give slightly smaller files. Every fallback still works offline.
Results
What converting does — and what it cannot undo
Honesty first: a JPG has already discarded detail, and no converter can put it back. Converting to PNG does not restore the quality the JPG lost when it was created. What it does is freeze the picture exactly as it is now: PNG stores every pixel of the decoded image, so every future edit, crop and re-save costs nothing.
That is the reason the conversion exists at all. JPG is an endpoint format — fine for publishing, punishing for working. PNG is a working format.
When JPG to PNG is the right move
- You are about to edit the image. Opening, adjusting and re-saving a JPG repeatedly compounds the loss. Convert to PNG once, edit the PNG, export a JPG at the end.
- The destination demands PNG. Design handoffs, some asset pipelines and a fair number of upload forms whitelist
.pngand reject everything else. - You need an alpha channel later. PNG supports transparency; a PNG copy of a JPG has a fully opaque alpha channel ready for whatever masking comes next.
- Archive copies. For pictures you intend to keep and re-use for years, lossless storage removes the question of what repeated saves did to them.
The trade, stated plainly
| JPG | PNG | |
|---|---|---|
| Compression | Lossy | Lossless |
| Photograph size | Baseline | Often several times larger |
| Re-saving | Costs quality each time | Free, forever |
| Transparency | None | Full alpha channel |
| Best for | Publishing and sharing | Editing, archives, graphics |
A photograph that weighs 400 KB as a JPG can easily weigh several megabytes as a PNG, because PNG stores detail the JPG had thrown away as invisible. That is expected and it is the price of losslessness — the reverse trip is PNG to JPG, which shrinks the file again when you publish.
Converting a whole folder
Select every JPG you want in the file picker, or drag a multi-selection onto the page. Files are processed in parallel background workers. On a phone the finished PNGs can be handed to the system share sheet so they land directly in your photo library.
Related conversions
Going the other way is PNG to JPG; for the modern web format that keeps transparency and stays small, see JPG to WebP; and if your file is already WebP, WebP to PNG does the same lossless hop from there.
Frequently asked questions
Is converting JPG to PNG lossless?
The PNG output preserves the decoded JPG exactly — every pixel, no further loss, and every future re-save is free. The loss the JPG picked up when it was first created is already baked in and cannot be recovered by any converter.
Will the PNG file be larger than the JPG?
Almost always, and often by several times for photographs — PNG stores detail that JPG deliberately discards. That is the normal cost of moving to a lossless format. If you need the file small again later, PNG to JPG brings it back down.
Why would I convert to a bigger file?
Because size is not the only property that matters. PNG survives editing and repeated saving without degrading, carries an alpha channel, and is the format a number of design tools and upload forms insist on.
Can I convert many JPG files at once?
Yes. Select as many as you like and they convert in parallel background workers. On desktop the finished files download individually or as one archive; on an iPhone they go to the share sheet and land in your photo library.
Are my images uploaded to a server?
No. This is a static site with no upload endpoint. The conversion runs in your browser tab, on your own hardware.