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Doitsu · 06-13-2015, 06:15 PM

It looks like the font sizes were indeed changed in the AZW3 files. Theoretically this shouldn't happen unless you've added an additional CSS file or CSS rules in Calibre. Select Preferences > Common Options > Look & Feel and make sure that no CSS file paths or CSS rules are shown under Extra CSS.
If Extra CSS is empty, try converting your ePubs with Kindle Previewer/KindleGen, split it with the Calibre KindleUnpack plugin in Mobi7 and AZW3 components and have a look at the AZW3 file. If the KindleGen generated styles look more or less OK, you may want to ask a moderator to move this whole thread to the Calibre Conversion forum, because you might have found a rare Calibre bug that only Kovid Goyal can help you with.

EDIT: I converted the original file myself and can confirm that Calibre does indeed change the paragraph font size from 16px in the original file to 20px in the converted AZW3 file. A KindleGen generated AZW3 file doesn't have this issue. There appears to be a bug in the AZW3 converter.

06-13-2015, 06:15 PM	#11
Doitsu Grand Sorcerer Posts: 5,735 Karma: 24031401 Join Date: Dec 2010 Device: Kindle PW2	It looks like the font sizes were indeed changed in the AZW3 files. Theoretically this shouldn't happen unless you've added an additional CSS file or CSS rules in Calibre. Select Preferences > Common Options > Look & Feel and make sure that no CSS file paths or CSS rules are shown under Extra CSS. If Extra CSS is empty, try converting your ePubs with Kindle Previewer/KindleGen, split it with the Calibre KindleUnpack plugin in Mobi7 and AZW3 components and have a look at the AZW3 file. If the KindleGen generated styles look more or less OK, you may want to ask a moderator to move this whole thread to the Calibre Conversion forum, because you might have found a rare Calibre bug that only Kovid Goyal can help you with. EDIT: I converted the original file myself and can confirm that Calibre does indeed change the paragraph font size from 16px in the original file to 20px in the converted AZW3 file. A KindleGen generated AZW3 file doesn't have this issue. There appears to be a bug in the AZW3 converter. Last edited by Doitsu; 06-14-2015 at 01:46 AM.