Options
- Resize: keep the original size, scale by a percentage, or set a maximum width and height. The aspect ratio is always kept, and with a maximum size small images are never enlarged.
- Rotate: turn the image 90, 180 or 270 degrees clockwise.
- Flip: mirror the image from left to right, for example a selfie or a scanned negative.
- Grayscale: convert to black and white using the standard brightness weights for red, green and blue.
- DPI: write 72, 96, 150, 300 or 600 DPI into the PNG file.
How to convert with options
- Choose the options first.
- Add the JPG files. They are converted with the current options.
- If you change an option later, click Convert again to apply it to the whole list.
- Download each PNG or one ZIP.
What DPI does and does not change
DPI is a note in the file that tells printers and programs such as Word how large to print the image. It does not change the pixels. A 3000 × 2000 pixel image at 300 DPI prints at 10 × 6.7 inches, and at 150 DPI at 20 × 13.3 inches. If a print shop asks for 300 DPI at a given size, multiply the inches by 300 to get the pixels you need and resize to that.
Resize first to keep PNG files small
A PNG of a 12 megapixel phone photo can be 15 MB or more. If the image is for a document, an email or a form, set a maximum size such as 1600 or 2000 pixels. The file shrinks by a lot and still looks sharp on screen.
Related tools
For a plain conversion with no changes use JPG to PNG. To resize without changing format use the image resizer, and to crop or rotate only use the image cropper and image rotator. The JPG vs PNG guide explains when PNG is worth the extra size.