Convert JPG to PNG Online
Convert JPEG images to lossless PNG format online — free, browser-based, no upload.
PNG uses lossless compression, meaning every pixel is preserved exactly as it is. Converting a JPG to PNG is useful when you need to edit the image further without any additional quality loss, when you need to work with a format that supports a transparent background, or when a workflow specifically requires PNG input. Note that converting from JPG to PNG does not recover quality already lost during JPEG compression — the output PNG simply prevents any further degradation. Dockitt performs the conversion entirely in your browser using the Canvas API, with no server upload.
How to use
- Click 'Choose JPG' and select the JPEG image you want to convert.
- Click 'Convert to PNG' and wait while the image is processed in your browser.
- Download the PNG file.
FAQ
Does converting JPG to PNG improve image quality?
No. Converting from JPG to PNG does not recover the quality lost during JPEG compression. The output PNG preserves the current pixel values exactly, preventing any further degradation, but compression artefacts already present in the source image will remain in the output.
Why would I convert a JPG to PNG?
Common reasons include: you need a lossless copy for further editing without introducing additional compression artefacts; a tool or workflow specifically requires PNG input; or you want a format that can support transparency (although the converted PNG will still have an opaque background unless you edit the alpha channel afterwards).
Will the PNG file be larger than the original JPG?
Yes, in most cases. PNG uses lossless compression, which preserves every pixel exactly. For photographic content, this results in significantly larger files than JPEG. For images with large areas of solid colour (icons, diagrams, screenshots), PNG may produce smaller files.
Does the PNG output support transparency?
The PNG format supports transparency, but the source JPG does not contain an alpha channel. The converted PNG will have a fully opaque background. To create transparency, you would need to edit the image after conversion using an image editor that supports alpha channel editing.
Can I convert multiple JPGs at once?
This tool converts one file at a time. For batch conversion, consider using a desktop application such as ImageMagick, or repeat the conversion for each file.
Is the conversion done in my browser or on a server?
The conversion runs entirely in your browser using the Canvas API. Your image is never uploaded to any server.