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How Do I Fix Formatting Errors After Uploading Books To Kindle?

Just uploaded a few ePub books to my Kindle Paperwhite and some lines break weirdly, titles vanish. What's a quick fix for this common sideloading formatting issue?
2025-07-11 01:11:36
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6 Answers

Best Answer
T Johnstone
T Johnstone
As a last resort, you can try to reconvert the ebook file to a Kindle-compatible file (such as .mobi or .azw3) using Calibre and an appropriate output profile for your Kindle and then upload the resulting file. Frequently, spacing problems with ebooks come from the embedded styles in the original file. Recently, for instance, I encountered some spacing problems with a free online werewolf-romance ebook, “Accidentally Marked By The Alpha King”. (Free online, so I downloaded the EPUB, and then used Calibre to convert it to a sideloadable format.)
2026-08-05
Simon
Simon
Ugh, Kindle formatting errors are so annoying. Usually, I just reconvert the book to see if switching to EPUB and then back to MOBI will fix the problem. But if the text is all jumbled and messed up, I just open it up in Notepad++ and strip it of all the formatting in there. Calibre’s ‘Polish’ feature is also really good at cleaning up a book’s metadata as well as spaces between paragraphs. Occasionally, a book will be so messed up that I have to re-download it from the site where I got it, or convert it using a different method. And sometimes, the only thing that I can do to fix up a font that looks all wrong is to change the Kindle’s display to a different font size or type. Not the best fix, but it works.
2025-07-14
Jace
Jace
I come across problems with formatting, after uploading a book to Kindle. Most of the time it can be fixed by changing the file type from azw3 back to mobi or even better .epub. (Kindle supports .mobi and .epub). Then again, I use the free software Calibre to convert my files. There I choose the correct output format and change some settings like the spacing between paragraphs or the embedding of fonts. Problems occur mostly with PDFs because they are not meant for reflowable text and therefore sometimes can be a mess after conversion. Here then I extract the text from the PDF and rework it in word processing software before converting it to the required e-book format.

As an added benefit, opening up your sideloaded eBook in Sigil, the premier EPUB editor, can also fix issues with weird line breaks and/or paragraph indentations. Within Sigil, you can also debug and fix any hidden styling or too many divs in your HTML and even CSS. Sometimes Embedded Images don’t show up properly. Compressing down the images to a lower resolution, and re-embedding them usually fixes this. And lastly, double check your book’s metadata, as an incorrect book title or author can cause viewing problems as well. And lastly, failing everything else, you can always email the files to your Kindle using the Personal Documents feature of your Amazon account, which should force kindle to re-auto-format it correctly.
2025-07-16
Rossa Monica
Rossa Monica
I have set up a “Golden Settings” profile for Kindle conversion in Calibre. The settings for “Look & Feel” are: disable “Smarten punctuation”. The settings for “Heuristics” are: join lines shorter than 50 chars. For “Structure Detection” set the chapter markers to “//h:h1”. For “Table of Contents” enable “Use existing table of contents” and also enable “Generate a table of contents from the existing chapter markers”. For “Save current output profile” set it to “Kindle” and “EPUB” as the output format. I then save this as a custom preset. I can now use this for any book I convert, and 95% of the time it looks exactly as I would have wanted. (It has taken a long time and many trials to get it this good though.)
2026-07-31
Johnella Condon Orr
Johnella Condon Orr
The majority of formatting problems that arise with eBooks arise from conflicts between an eBook’s CSS styles and the eBook reader’s default styles. Open your EPUB in an editor (such as the built-in editor in Calibre), open the eBook’s CSS file and simplify it by removing all declarations with ‘!important’ from them. Set the body margin to zero. Define a solid font-family stack. Make sure all your measurements are set up in ‘em’ or ‘%’ rather than fixed ‘px’. Because a Kindle book is read off of screens of varying sizes, using relative units to measure rather than fixed pixels is key to fix formatting issues such as having every other paragraph centered for no apparent reason as I encountered in my last upload.
2026-07-31

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