Today I will tell you how to save a picture taken in Midjourney in high quality.
There is one method that I have tested. See screenshots on how to do this:
Click the Upscale 4x button
After generation, click Open in Browser
And in the Browser, save it as a regular picture, right-click – save as…
On mobile, long-tap the image and then tap the download icon in the top right corner.
Reference – Midjourney Image Sizes
The default size of a Midjourney image using the current default Model Version is 1024 x 1024 pixels. You can use the upscale tool, to increase the file size to 2048 x 2048 or 4096 x 4096 pixels. Using other aspect ratios will produce images with different dimensions but the same general file size.