PDF to EPUB Conversion - best practice?

Verdi-Fan · 09-29-2024, 05:06 PM

Good evening!
First of all, a big compliment to the creator of Caliber Software. A wonderful program that I am discovering more and more for myself.
A question about conversion:
I get the best results when I convert a PDF file to an *.epub file .
Vice versa its a catastrophe and that's not the point here either

PDF to Epub is a very very good result. Does anyone have experience with how to optimize the results? So a smaller font size so as not to produce so many pages, etc. I always get an incredible number of pages. Are there any instructions or tips for this? Thank you very much!
Kind regards
VF

aborel · 10-01-2024, 01:41 AM

Surprising post: your observation is opposite to the usual experience and the official FAQ https://manual.calibre-ebook.com/con...-pdf-documents . Converting to PDF usually works better than PDF to anything.

Now if your PDFs produce something reasonable, by all means, go for it :-) However, you might have more control on the output if you convert to a fully editable format (docx, odt or RTF), fix all issues using your word processor of choice, and then convert to epub.

Ma'am-I-Am · 10-07-2024, 03:32 AM

Now that Calibre has updated its ability to convert PDF to other formats, I do have one question:
After 38 minutes converting PDF to epub (I think the message said "converting to html"), progress was at only 1%. I aborted because my backup would have interrupted it anyway. Any insight on why it takes so long?

retiredbiker · 10-07-2024, 10:34 AM

Quote:

Originally Posted by Ma'am-I-Am

Now that Calibre has updated its ability to convert PDF to other formats, I do have one question:
After 38 minutes converting PDF to epub (I think the message said "converting to html"), progress was at only 1%. I aborted because my backup would have interrupted it anyway. Any insight on why it takes so long?

Since nearly anything can be hiding inside a pdf, it could be many things. One consistent problem seems to be complexity. People have reported waiting days or weeks trying to convert dictionaries or bibles, for example. If your pdf is reasonably small, simple, and has a clean text layer it should not take too long on modern hardware.

Take your pdf and try to highlight and copy-paste some text out of it from your pdf viewer. If that does not work, you are in trouble already. And if the text does copy out but is not very good, it is probably from an iffy OCR (Optical Character Recognition) done on the images, and the only way to fix that is to proofread and edit it.

BetterRed · 10-07-2024, 07:44 PM

@Ma'am-I-Am - If you have access to a recent version of MS Word, try opening the PDF with it, Save as DOCX, and then convert that to EPUB.

My experience is that it's often faster - i.e. 5 minutes to convert rather than two hours, and the result is often better… i.e. a more accurate representation of the PDF

Some 'glitches' are easier to correct in Word than in an EPUB Editor… e.g. section headings.

BR

09-29-2024, 05:06 PM	#1
Verdi-Fan Junior Member Posts: 5 Karma: 10 Join Date: Jan 2024 Device: Onyx Boox Note Air 3	PDF to EPUB Conversion - best practice? Good evening! First of all, a big compliment to the creator of Caliber Software. A wonderful program that I am discovering more and more for myself. A question about conversion: I get the best results when I convert a PDF file to an *.epub file . Vice versa its a catastrophe and that's not the point here either PDF to Epub is a very very good result. Does anyone have experience with how to optimize the results? So a smaller font size so as not to produce so many pages, etc. I always get an incredible number of pages. Are there any instructions or tips for this? Thank you very much! Kind regards VF

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10-01-2024, 01:41 AM	#2
aborel Enthusiast Posts: 29 Karma: 98 Join Date: Dec 2013 Device: Kobo Aura	Surprising post: your observation is opposite to the usual experience and the official FAQ https://manual.calibre-ebook.com/con...-pdf-documents . Converting to PDF usually works better than PDF to anything. Now if your PDFs produce something reasonable, by all means, go for it :-) However, you might have more control on the output if you convert to a fully editable format (docx, odt or RTF), fix all issues using your word processor of choice, and then convert to epub.

10-07-2024, 03:32 AM	#3
Ma'am-I-Am Preferred pronouns: We/Us Posts: 157 Karma: 282162 Join Date: Jun 2014 Location: <--- Over There, USA Device: Kindle PW 2	Now that Calibre has updated its ability to convert PDF to other formats, I do have one question: After 38 minutes converting PDF to epub (I think the message said "converting to html"), progress was at only 1%. I aborted because my backup would have interrupted it anyway. Any insight on why it takes so long?

10-07-2024, 07:44 PM	#5
BetterRed null operator (he/him) Posts: 21,000 Karma: 27620706 Join Date: Mar 2012 Location: Sydney Australia Device: none	@Ma'am-I-Am - If you have access to a recent version of MS Word, try opening the PDF with it, Save as DOCX, and then convert that to EPUB. My experience is that it's often faster - i.e. 5 minutes to convert rather than two hours, and the result is often better… i.e. a more accurate representation of the PDF Some 'glitches' are easier to correct in Word than in an EPUB Editor… e.g. section headings. BR

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