Hello AnnaRashbrook,
Thank you for writing to Microsoft Community Forums.
The feature you are looking for is available on
Paint application. You can change the dpi resolution of a picture by selecting
Resize option from the top menu and change the Horizontal and
Vertical aspect ratio. As a workaround, you can edit the image on Paint 3D by selecting an option ‘Edit with Paint 3D’, which moves the picture from Paint to Paint 3D app to make further changes.
However, the feature you’re looking for is a great one for Paint3D software.
There may be other users with the similar requirements. As for now, this particular feature is unavailable. Hence, I suggest you to post a feedback in the
Feedback Hub, so that our Developer team can have a look into it and include that in the future updates.
Mala S
Microsoft Community - Moderator