NSScreenshotMaker is a tool that will allow you to sign images for the Nintendo Switch.
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Scene Developer @cheuble has put together a simple program to sign your own images so you can view them in the Switch 'album' feature, which is originally designed only to view game screenshots, but now you can add any photos on the SD card you want!

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You will also need the 'key' to make this work, but that is simple to find, just take a look at our 'news story' screenshot!

NEWS SOURCE: NSScreenshotMaker (via) GBATemp