Image · iEdit Scanner
Change the DPI of an image to 300 for print, losslessly
iEdit sets the DPI of a photo to 72, 96, 150, 300, 600 or any value from 1 to 10,000 on your iPhone, iPad or Android device, and previews the resulting print size in centimetres and inches. For JPEG and PNG only the header changes, so the pixels stay exactly as they are.
Overview
DPI tells a printer or a layout program how large an image should appear on paper. iEdit shows the DPI an image carries now, or tells you that none is set and that most apps will read it as 72. Pick 72 or 96 for screens, 150 for documents and home printing, 300 for print quality, 600 for fine detail, or type any value from 1 to 10,000. As you change it, the print size in centimetres and inches updates underneath.
For JPEG and PNG only the DPI in the file's header changes; the picture itself is untouched, byte for byte, so there is no loss and no re-encoding. Formats that cannot hold a DPI, such as HEIC and WebP, are re-saved as JPEG at 95% quality or as lossless PNG, and iEdit tells you which before you confirm. The colour profile and EXIF details are kept. If the image already has the DPI you picked, iEdit says so instead of writing a copy.
Print shops, passport-photo services, academic journals and job portals often insist on 300 DPI even though the pixels are what matter. This tool meets the requirement in a few seconds, on your device, with no upload. The result is saved as a new file in My files and the original stays as it was.
Why people use it
- 01
Lossless for JPEG and PNG
Only the header changes, so the picture stays exactly as it was.
- 02
Print size preview
See the width and height on paper in cm and inches before you save.
- 03
Any value to 10,000
Common presets from 72 to 600 DPI, or type the exact value a printer asks for.
How to use Image DPI in iEdit
- 1
Open iEdit and tap Image DPI on the Photo tab.
- 2
Pick an image from My files or your device.
- 3
Choose 72, 96, 150, 300 or 600 DPI, or type your own value.
- 4
Check the print size, then tap Set DPI to save a copy to My files.
Frequently asked questions
Does changing the DPI change the resolution or quality of my image?
No. DPI is a note in the file about how large the image should print; the number of pixels stays the same. For JPEG and PNG, iEdit rewrites only that note, so the picture data is identical. To change the pixel size, use Resize image instead.
Can I set the DPI of an image offline, without uploading it?
Yes. iEdit writes the DPI on your iPhone, iPad or Android device with no server involved, so it works without a connection and the image is never uploaded. A copy with the new DPI is saved to My files; your original is not modified.
Is the DPI tool free?
Yes. Setting the DPI is free and the result is saved to My files at no cost. Sharing the file, or saving it to Files or to your photo library, is part of iEdit Premium, an optional monthly subscription with a 3-day free trial.
Try Image DPI in iEdit
Available for iPhone, iPad and Android.