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How can I permanently change the font size that is used for input. I would love to have a 12 or 14 point font available.

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    $\begingroup$ See also this question $\endgroup$
    – Chris K
    Commented Aug 8, 2016 at 15:34
  • $\begingroup$ Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Take the tour! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! $\endgroup$
    – Michael E2
    Commented Aug 8, 2016 at 16:22

4 Answers 4

Reset to default
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Edit > Preferences > Advanced > Open Option Inspector

In Formatting Options, find Font Options entry. There you will find FontSize which is set to 12 by default. You can change it to any other number.

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  • $\begingroup$ This does work with version 8.0.4 but with versions 10.4.1 and 11.0.0 changing of FontSize has no effect. $\endgroup$
    – Alexey Popkov
    Commented Aug 15, 2016 at 0:12
  • $\begingroup$ This is not ideal, you would want to address FontSize from a notebook's/your default stylesheet to account for all the specific styles. $\endgroup$
    – ktm
    Commented Aug 15, 2016 at 15:54
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To set the default magnification for a notebook:

Preferences -> Advanced -> Notebook Options -> Display Options -> Magnification

then double click slowly on the "value" until it highlights blue and then you can type a default value corresponding to 100%

enter image description here

The font on my computer was originally set for fighter pilots or eagles:)

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A purely programmatic way to change the default magnification for the Notebooks:

SetOptions[$FrontEnd, Magnification -> 1.5]

or equivalently

CurrentValue[$FrontEnd, Magnification] = 1.5;

In version 11 the default font used by the FrontEnd is changed. If you prefer "Courier New" as it was in the previous versions, you can use new-in-version 11 undocumented StyleHints option: 

SetOptions[$FrontEnd, StyleHints -> {"CodeFont" -> "Courier"}]

or equivalently

CurrentValue[$FrontEnd, {StyleHints, "CodeFont"}] = "Courier";
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  • $\begingroup$ As noted here, Consolas is the default only for Windows systems. $\endgroup$
    – J. M.'s missing motivation ♦
    Commented Aug 15, 2016 at 3:33
  • $\begingroup$ @J.M. Thanks, I have changed the answer accordingly. $\endgroup$
    – Alexey Popkov
    Commented Aug 15, 2016 at 3:51
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Preferences > Advanced > Open Option Inspector > Notebook Options > Display Options > Magnification

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  • $\begingroup$ Works great. Just what I needed $\endgroup$
    – Sol Guber
    Commented Aug 15, 2016 at 23:25

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