XnView Software

Can someone confirm how to resize jpg images without losing quality?

https://www.xnview.com/wiki/index.php?title=Resize

If you only want to change the size of the image (canvas), and not the image's content, then use the menu item Image > Canvas Size.

...but it reduces number of image pixels.

I'm running XnView MP 1.5.5 64-bit (Windows) under Win10.

The docs don't reflect the current software. Resize allows changing print size without resampling.

It may not be supported. Gimp recognised the print size but ImageMagick and Paint.net ignored it and reported print size based on 72 dpi.