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For those who are converting kindle to pdf format,
please check the original aspect ratio and page margins before you convert your kindle. Some of pdfs that are shared here look weird because their aspect ratio changed. Don't get me wrong. What I want to do is not complaining about your works. I just want to give you information because even I, didn't realized that I made mistakes in aspect ratio & page margins when I first converted kindle to pdf.

You can check the original aspect ratio by checking the cover image.
In calibre, you can change pagemargins at [Preferences]-[output options]-[pdf output]. And you can also change the aspect ratio by using custom size option.

When I convert kindle to pdf, I always do this.

1. Check the size of cover image in the calibre.
2. Set page margins to 0.
3. Set custom size to exact same value to the size of original cover image, and select 'devicepixel' in Unit option.
4. Check 'Preserve aspect ratio of cover' option.

That's it. I'm sure that you can do similar settings even if you use different software to convert kindle.

I always appreciate your contribution and kindness.
Thank you.