The free image viewer IrfanView will make this a trivial task.
Set your resolution as required and save your image(s).
Then, open the image in IrfanView and tap the 'i' key for Information. As shown in the first image, you can specify the DPI (be sure to hit 'Change' afterwards) and save your updated image.
If you have a group of pictures to convert, put them all in the same folder, double-click on one of them to open and tap the 'b' key for Batch operation. Click on 'Advanced' to bring up the "Set for all images:" popup and set the DPI (and image size, if you haven't already done that). Make sure all your desired files are selected and go.
« Last Edit: February 14, 2020, 04:24:48 PM by Jeffin90620 »
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