Original
- File name
- Image dimensions
- File size
IMAGE TOOLS
JPG to PNG●
A JPG in. A PNG out. Nothing leaves your browser.
A new format. A better fit. A smaller file.
Drop static PNG, JPG, WebP or HEIC images here, or choose files.
Select up to 20 files, 100 MiB combined. Each image: up to 20 MiB, 16 megapixels and 8,192 pixels per side. Static PNG, JPG, WebP and HEIC only.Your image is processed in this tab, not uploaded or saved by dotool.app. Refreshing or closing the tab clears it. My workspace saves only a link to the tool.
Choose an image to begin.
Your images
Common settings apply to every file. With Keep proportions in Pixels mode, the width is shared and each height follows its own image. Files are processed one at a time.
| Image | Original size | Result | Status | Actions |
|---|
ZIP includes ready files only, including clearly marked results that did not reach their target. It bundles the image files without recompressing them.
Target size and reduction need JPG or WebP. Select one of these formats to enable them.
Higher quality usually creates a larger JPG or WebP. PNG does not use this setting.
Lossless mode uses OxiPNG to optimise the original PNG when dimensions are unchanged. Pixel values and transparency are preserved. Changing Image size still resizes pixels. No colour quantisation is applied.
Used for JPG transparency and for added borders in Fit with background.
Your result
Settings changed. Generate a new preview to update the result.
- Image dimensions
- File size
Before & after
Drag the divider to compare the result with the original in the same view. Zoom focuses on the centre; download the file to inspect the full image.
Previews fit the available space. Open or download the result to inspect it at full size.
Continue with this result
Use the generated image as the input for another tool, without choosing a file again.
Canvas export re-encodes pixels. Original metadata is not preserved; colour appearance may vary. This is not a lossless metadata-preserving optimiser.
What changes when JPG becomes PNG.
PNG is lossless, so the converted file keeps every pixel of the JPG exactly as it is. It cannot bring back detail the JPG already discarded, and a PNG made from a photo is usually much larger. The result has no transparency of its own, because a JPG has none. Convert when a site, editor or printer asks for PNG specifically.
All tools →Common questions
Does converting JPG to PNG improve quality?
No. PNG stores the pixels without further loss, but the detail removed when the JPG was saved cannot be restored. The image will look the same and the file will usually be larger.
Will the PNG have a transparent background?
No. A JPG has no transparency, so the PNG is fully opaque. To cut out a background you need an editor that removes it.
Is my image uploaded anywhere?
No. dotool.app converts the image in this browser tab. The file is not sent to a server or saved, and closing the tab clears it.