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Old 01-11-2026, 04:14 AM   #1741
oops
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Quote:
Originally Posted by alessandrokindle View Post
Hi, I have an EPUB file that contains different types of fonts. After using your tool, the fonts are not preserved...
Hi. I ran into the same problem and have root-caused it and have a fix. First of all, the KFX Output plugin is not at fault. Kindle Previewer/KindleGen are the ones that are misbehaving. In my case, there would be messages in "KPR.Log" where the font files would be invalidated. The reason is that "FontValidator.exe" is a) a 32-bit application and b) requires the x86 2013 VC redistributable DLLs. It might complain only about "msvcr120.dll" and you'll be tempted to just copy it alongside the executable, but looking at the executable in Dependency Walker, it needs its supporting libraries as well. In my case the redistributable was not installed--I don't play games on this machine and Steam tends to be the one installing these nowadays. Installing the redistributable fixed the problem.

For reference here is what the error looks like in "KPR.Log":
Spoiler:
[ERROR] Invalidating the font:%LOCALAPPDATA%\Temp\2f029474-7d9d-47a1-b485-786b93621966\conv_out\book\res/rsrc55B

In addition, some fonts might require conversion to TrueType glyphs to display properly, so make sure that you take care of that in case it is still not working for you. This is what that warning from KindleGen looks like; note that it doesn't bubble up to Kindle Previewer's conversion log:
Spoiler:
************************************************** ***********
Amazon kindlegen(Windows) V2.9 build 0000-kdevbld
A command line e-book compiler
Copyright Amazon.com and its Affiliates 2015
************************************************** ***********
...
Warning(prcfile):W14029: CFF/Type1 (Postscript) embedded font included in your source may not render clearly on all Kindle readers. Please refer to Kindle Publishing Guidelines on the recommended usage of embedded fonts. Font File : ...

Quote:
Originally Posted by jhowell View Post
If that doesn't work I would need to see an example of an EPUB the loses its fonts when converted in order to diagnose this further.
Hopefully @jhowell, this saves you some sleuthing.
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Old 01-11-2026, 02:12 PM   #1742
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Quote:
Originally Posted by oops View Post
Hi. I ran into the same problem and have root-caused it and have a fix.
Thanks for the useful information.
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Old Today, 05:37 AM   #1743
alessandrokindle
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Quote:
Originally Posted by oops View Post
Hi. I ran into the same problem and have root-caused it and have a fix. First of all, the KFX Output plugin is not at fault. Kindle Previewer/KindleGen are the ones that are misbehaving. In my case, there would be messages in "KPR.Log" where the font files would be invalidated. The reason is that "FontValidator.exe" is a) a 32-bit application and b) requires the x86 2013 VC redistributable DLLs. It might complain only about "msvcr120.dll" and you'll be tempted to just copy it alongside the executable, but looking at the executable in Dependency Walker, it needs its supporting libraries as well. In my case the redistributable was not installed--I don't play games on this machine and Steam tends to be the one installing these nowadays. Installing the redistributable fixed the problem.

For reference here is what the error looks like in "KPR.Log":
Spoiler:
[ERROR] Invalidating the font:%LOCALAPPDATA%\Temp\2f029474-7d9d-47a1-b485-786b93621966\conv_out\book\res/rsrc55B

In addition, some fonts might require conversion to TrueType glyphs to display properly, so make sure that you take care of that in case it is still not working for you. This is what that warning from KindleGen looks like; note that it doesn't bubble up to Kindle Previewer's conversion log:
Spoiler:
************************************************** ***********
Amazon kindlegen(Windows) V2.9 build 0000-kdevbld
A command line e-book compiler
Copyright Amazon.com and its Affiliates 2015
************************************************** ***********
...
Warning(prcfile):W14029: CFF/Type1 (Postscript) embedded font included in your source may not render clearly on all Kindle readers. Please refer to Kindle Publishing Guidelines on the recommended usage of embedded fonts. Font File : ...


Hopefully @jhowell, this saves you some sleuthing.
This fixed the problem, thank you so much!
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Old Today, 12:09 PM   #1744
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Quote:
Originally Posted by alessandrokindle View Post
This fixed the problem, thank you so much!
I take it that this is a Windows-specific issue?
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