Offcloud guide
JPG to PNG converter: get a lossless working copy of your image
Sometimes a JPG just won't do: an editor degrades it a little more with every save, or an upload form flat-out refuses anything but PNG. Offcloud converts your JPG to PNG in seconds, free and with no signup. The conversion runs 100% locally in your browser, so your image never leaves your device.
Why convert a JPG to PNG?
JPG is a lossy format: every time you save a JPG in an image editor, it gets re-compressed and loses a little more detail. Converting it to PNG first gives you a lossless working copy — you can edit, save, and save again without stacking up new compression damage. That makes it the smart first move before retouching a photo, annotating a screenshot, or iterating on any image you plan to reopen more than once.
The other common reason is simply that a tool demands it. Plenty of upload forms, design apps, and print services only accept PNG files, and graphics with sharp text or flat colors generally hold up better in PNG going forward. Rather than fight the requirement, run a quick JPG to PNG conversion and satisfy it in seconds.
Decoded and re-encoded on your own device
There is no upload step to wait for here: Offcloud decodes and re-encodes your image's pixels directly in the browser, using WebAssembly and canvas technology. No file transfer, no processing queue, no waiting on someone else's server — the conversion happens entirely on your own device.
That design is also what makes it private. Your JPG never leaves your computer or phone, nothing is stored online, and nothing is kept once the conversion is done. It is completely free, with no account to create and no watermark on the result, and it works in any modern browser on desktop or mobile.
What PNG fixes — and what it can't
Let's be clear about what a conversion cannot do: it never improves the original. Compression artifacts already baked into your JPG — blocky edges, smudged detail — carry over into the PNG exactly as they are. Converting also does not add transparency, because a JPG has no transparent pixels to begin with; the background stays exactly as it was. What PNG guarantees is that no further quality is lost from this point on.
The file will grow — often several-fold for photos — and that is the trade you are making: size in exchange for stability across future edits. Two practical tips: convert before you start editing rather than after, and keep the original JPG as a backup.
Conversion steps
- Open Offcloud in your browser — there is no account to create and nothing to install.
- Select your JPG file, or simply drag and drop it onto the page.
- Choose PNG as the output format; the conversion runs locally in your browser and nothing is uploaded.
- Download your new PNG file and keep the original JPG as a backup.
Frequently asked questions
Will converting my JPG to PNG make the background transparent?
No. A JPG contains no transparency information, so the conversion reproduces the image exactly as it is, opaque background included. PNG supports transparency as a format, but converting alone cannot create it.
Does converting a JPG to PNG improve the image quality?
No — no conversion can recover detail the JPG compression already discarded, and any artifacts carry over as they are. What PNG gives you is a lossless copy, so the image will not degrade further with future edits and saves.
Why is my PNG so much bigger than the original JPG?
PNG stores every pixel losslessly, while JPG compresses photos aggressively. For photographic images, the PNG version can easily be several times larger — that is expected behavior, not an error.
Is it safe to convert personal photos with Offcloud?
Yes. The conversion runs entirely in your browser, so your photo is never uploaded to any server, nothing is stored online, and nothing is kept after the conversion finishes.
Is there a limit on file size or on how many JPGs I can convert?
No. Offcloud is free with no signup, and because nothing is ever uploaded, there is no server-side limit to hit. The only constraint is your device's memory: very large images simply take a bit longer to process.