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DNSB · 02-03-2026, 11:50 PM

XTC/XTCH are ePubs converted into bitmaps. XTC is B&W, XTHC is greyscaled. I think one brand of underpowered ereaders uses that format since it does require relatively little CPU power. I tried an online conversion about a year ago and it was pathetic. The characters were pixelated and the pages started drifting. After 25 or so pages in, it made the pages unreadable. The file size increased by about 15 times as a 6MB epub came out as a 90MB file and that was without the cover image which vanished in the conversion.

02-03-2026, 11:50 PM	#3
DNSB Bibliophagist Posts: 50,322 Karma: 178402650 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	XTC/XTCH are ePubs converted into bitmaps. XTC is B&W, XTHC is greyscaled. I think one brand of underpowered ereaders uses that format since it does require relatively little CPU power. I tried an online conversion about a year ago and it was pathetic. The characters were pixelated and the pages started drifting. After 25 or so pages in, it made the pages unreadable. The file size increased by about 15 times as a 6MB epub came out as a 90MB file and that was without the cover image which vanished in the conversion.