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Very often the font size in pdf files is too small. To read the document one has to continuously scroll and zoom the document, which I find really annoying, especially when several windows are opened. On the other hand in ebook readers (e.g. Kindle) there is the possibility to change the font size of a pdf file.

Do you know whether there is any pdf reader software for macOS that has this feature?

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  • I've never seen any way to change pdf font size in Kindle other than zoom, unless you first convert it to some other format. – Tom Gewecke Jun 30 '17 at 17:40
  • Only the .epub format has the feature to customize font size - so you may need to look for pdf to .epub converter if this is more useful to you – Yoan Jul 1 '17 at 7:41
  • @TomGewecke Sorry I mean the Sony Reader, not Kindle. It has a function to change the font size. – Galuoises Jul 2 '17 at 11:41
  • @Yoan Convert it to epub first it is a good suggestion. Thank you! – Galuoises Jul 2 '17 at 11:41
  • Thanks for the clarification. I found a description of the sony feature at docs.esupport.sony.com/reader/PRST1/eng/contents/05/01/03/… – Tom Gewecke Jul 2 '17 at 12:44
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Anyhow I found that using preview and the combination of commands cmd+ctrl+f the screen goes to two pages and it can be zoomed. This is comfortable enough for reading!

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I don't know of any app that will adjust just the font size. Adobe Acrobat Reader has multiple zoom settings which once set will stay at that level till changed. I often use this feature with settings like 125% or 150%. These setting are numerical in value instead on the common 'Zoom In' or 'Zoom Out' so its easy to reproduce. I think to change font size only one would have to convert PDF to a text document, adjust the font, and convert back to PDF. Not a cheap option but Acrobat Reader can do this for a price.

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Yeah I don't think PDF works that way. While you can have text in a PDF, along with it you'll have the font & placement on the page. If you want to alter the representation on the page you really should do it in an editor not a viewer, where text & metadata are handled separately instead of being bound together.

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