Open .pdn files free in your browser
Paint.NET’s layered image format, common on Windows. Photo in Madosuite opens .pdn files, in a browser tab.

Three steps
Open Madosuite
In your browser. A small Linux machine starts on your device.
Upload the file
In Files, press Upload and pick your .pdn file. Then open it with Photo.
Edit and save as
Save it as PSD, TIFF, ORA and download it.
Photo reads .pdn and has Paint.NET’s blend modes, so layers look the way they did. Save as PSD or PNG.
Photo opens
Photo saves
Questions
How do I open a .pdn file without paid software?
Open Madosuite in your browser, upload the file in Files, and open it with Photo. It is free.
Can I edit it and save it again?
You can edit it, then save it as PSD, TIFF, ORA, PNG. Photo does not write .pdn itself.
Is my file uploaded?
No. It goes into the Linux machine that Madosuite runs in your browser, on your device.
Will it look the same?
Photo reads .pdn and has Paint.NET’s blend modes, so layers look the way they did. Save as PSD or PNG.
Is Madosuite free?
Yes. The apps run on your own device, in the browser tab, so there is no server time to pay for. There is no trial period.