KCC strips the margins most manga conversions leave in, filling the e-ink screen edge to edge on Kindle, Kobo, reMarkable, and KOReader, and it corrects black levels so blacks don’t come out gray the way many Kindle Store scans do. It can shrink a 600 MB Humble Bundle volume to 100 MB by downscaling to your device’s native resolution. Free and open source (ISC license), with three releases shipped this August alone.