Export pad
In the export window there are two different paths, and the difference between them matters.

Export as Image
It exports your paintings as a flat image, in PNG, JPG, WebP or PSD format. Use it to share finished work, publish online or print.
You can export the page you're on right now, or every page of the notebook at once (each one is saved as a separate file).

When you export all the pages, the window tells you which one it's on as it goes, so you know it hasn't gotten stuck.
The image formats, and when to use each one
- PNG: lossless and with transparency. Ideal for illustrations, line art, and screenshots.
- JPG: photos. Compressed, no transparency.
- WebP: made for the web. Smaller than JPG while keeping good quality, and it supports transparency.
- PSD: the only one that keeps the layers. Each layer of your painting becomes an editable layer, so you can open the file in Photoshop and keep working. In exchange, the files are much heavier.
PNG, JPG, and WebP flatten the painting: once exported, the Layers are burned into the image. If you want to edit the file later, export to PSD.
Export resolution
When you export you can choose the density the image is saved at: 72 DPI, 150 DPI, or 300 DPI. This doesn't change how sharp it looks on your screen, but the quality the file is saved at for different uses.
- 72 DPI is the size as is, with no multiplying.
- 150 DPI doubles the image measurements.
- 300 DPI quadruples them.
For sharing on screen, 150 DPI is usually more than enough. Choose 300 only when the destination is print.
The window always shows the exact measurements the final file will have before you export, so you decide with the number in front of you instead of blindly.
With WebP and with PSD, the 150 and 300 DPI options appear dimmed: WebP is meant for screen and PSD already stores its own print data. If you pick one of those two formats, it will always be exported at 72 DPI.
Export the Whole Notebook
The other option is exporting the entire notebook in RobinPad format (.rpad). This is a complete copy: all the pages with all their layers, your brushes, and your theme references.
You can use this file to move your work to another computer, or to share the editable source with someone else who uses RobinPad.
It is not a proprietary or closed format. Under the hood it is just a plain .zip file with the extension changed. If one day you want to see what is inside, all you have to do is rename the .rpad extension to .zip and extract the contents.

Once you've exported the notebook, you can do whatever you want with it, save it however you like, and organize your notebooks in whatever way works best for you.