Convert JPG Photos to Lossless PNG Files
Re-save a JPG as a PNG so no further quality is lost each time the file is edited and saved again.
About the JPG to PNG Converter
This converter has no settings, and that is deliberate. PNG is a lossless format, so there is no quality slider to set and no transparency question to answer — the pixels currently in your JPG are written into the PNG exactly as they are. Add one file or many, press convert, and each arrives back with the same base name and a png extension.
It is worth being clear about what this does and does not achieve. Converting cannot recover detail that JPEG compression already discarded; whatever softness or blocking exists in the source is baked in and comes across unchanged. What it does prevent is further degradation. Every time a JPG is opened, edited and saved again it is re-compressed and loses a little more, whereas a PNG can be re-saved indefinitely without decay.
Key Features
- Nothing to configure: PNG is lossless, so there is no quality setting to get wrong and no background colour to decide.
- Stops generation loss: Once converted, repeated editing and saving no longer degrades the image the way repeated JPEG saves do.
- Batch friendly: Convert a set of photos in one run and collect them together as a ZIP.
- Names carried over: Each file keeps its original base name, which keeps a converted set matched to the originals.
- Alpha ready: The PNG output supports transparency, so any later editing can add a transparent background.
How to Use the JPG to PNG Converter
- Add the JPG files you want to convert.
- Press convert — there are no options to set, because PNG output is lossless.
- Download each PNG, or take the ZIP if you converted several.
How It Works
The image is decoded by the browser, drawn onto a canvas, and written out with canvas.toBlob as image/png. No library is used and no re-compression decision is made, because PNG encoding is lossless by definition. The practical consequence to expect is file size: a photograph stored as PNG is very often several times larger than the JPG it came from, since lossless compression cannot exploit the visual shortcuts JPEG relies on. For photographic content destined for a web page, that trade is usually not worth making.
When You Need It
Someone assembling screenshots as evidence for an employment tribunal or a harassment complaint needs the images to survive being cropped, annotated and re-saved by a solicitor without softening a little more each round. Converting to PNG at the start fixes the quality where it is. The material typically shows private messages and named individuals, so running it through an online converter would put a sensitive bundle in someone else's hands. Designers preparing a source image for repeated editing make the same conversion for purely technical reasons.