Coverify lets you turn any image into a perfectly optimized Kindle screensaver. Just drag and drop and it handles dithering, resizing, and format conversion automatically, so your artwork looks stunning on e-ink's 16-level grayscale display. Your first screensaver is free. Unlimited access is $0.99/month or $4.99 lifetime. Supports all major Kindle models: Basic, Paperwhite, Oasis, and Scribe.