How do I change the font size for text in my figure?

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I'm using "set(gca,'fontsize', 18);" in a function to change fonts in a figure. My code does not throw an error, but it also does not change the font size. I can manually change the fonts via the UI, but this is a slow process. I'm running MATLAB 2013a on RHEL6.5
I've also tried "set(gca,'FontSize', 18);" and specifying 'FontSize', 18 in title, xlabel, ylabel and legend. None of these have worked.
Please advise!
  10 Comments
Alex Hruksa
Alex Hruksa on 28 Aug 2020
This bit of code is super useful, thanks Image Analyst!
Muhammad Umar Farooq
Muhammad Umar Farooq on 20 Mar 2022
There are two ways of changing font details of graph.
First method:
title('Figure', 'FontSize', 12);
xlabel('x-axis', 'FontSize', 12);
text(x, y, 'Figure, 'FontSize', 12);
Second method:
Plot the graph, double click on the font whose details you want to change, or right click and open settings. Customize the details manually as per your desire. Good luck.

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Accepted Answer

Adam Danz
Adam Danz on 18 Mar 2022
Edited: Adam Danz on 18 Apr 2023
Here is a review of several solutions shared across 9 years in this thread and some guidance on deciding how to control font size in your graphics.
Starting in MATLAB R2022a
Use the fontsize function to set font sizes and font units in a figure.
Set a single font size and specify font units for text objects in a figure/axes/object using
fig = figure();
fontsize(fig, 24, "points")
Incrementally increase or decrease font size of text objects while maintaining relative differences in font size using
fontsize(fig, "increase")
fontsize(fig, "decrease")
fontsize(fig, scale=1.2) % 120%
See the fontsize page for more options and information.
Release R2022a also includes the fontname function to set font names within a figure.
For a review and examples, see this Community Highlight.
Alternatives to controlling FontSize prior to R2022a
The font size of text objects can be directly set from within text convenience functions:
title('My title', 'FontSize', 24)
xlabel('x axis', 'FontSize', 24)
ylabel('y axis', 'FontSize', 24)
text(0.5, 0.5, 'My label', 'FontSize', 24)
Or, you can set the font size of the text object after it is created:
th = title('My title');
th.FontSize = 24;
The font size of axes components can be set from within the axes' FontSize property. This will not affect text objects that do not belong to the axes:
plot(rand(5))
xlabel('x axis')
ylabel('yaxis')
title('My title')
text(3, .5, 'this') % will not be affected
ax = gca;
ax.FontSize = 16;
Another option is to find all objects in a figure with a FontSize property and to set the font size in those objects.
set(findall(gcf,'-property','FontSize'),'FontSize',24)
Common issues
Issue 1: After creating an axes and adding a text object to the axes with a specified font size, the specified font size is lost. Here's an example:
clf
ax = axes('FontSize', 24);
plot(rand(5))
ax.FontSize
ans =
10
The reason this happens is because some properties of new axes are reset after adding objects to the axes. This can be prevented in a couple of ways.
Solution 1: Retain axes properties by calling hold on after setting the axes font size.
clf
ax = axes('FontSize', 24);
hold on
plot(rand(5))
Solution 2: Set the axes font size after plotting
clf
plot(rand(5))
ax = axes('FontSize', 24);
Issue 2: If you specify font size using TeX markup, that object will not respond to font size change commands.
ax = axes();
xlabel('x axis')
ylabel('y axis')
th = title('\fontsize{24} My title');
th.FontSize = 8; % does not affect the title
The solution is to choose between specifying font size as TeX markup or by using the font size property.

More Answers (12)

Mike Garrity
Mike Garrity on 10 Feb 2016
Yes, this can be confusing. Here's what you're probably seeing:
figure % Creates a figure
set(gca,'FontSize',18) % Creates an axes and sets its FontSize to 18
plot(x,y) % Resets the axes and plots into it
Notice the "Resets the axes" part. One of the things that happens there is that the FontSize property gets set to the default!
This doesn't happen when hold is on because then the axes doesn't get reset.
There are a couple of ways around this.
The simplest is to set the FontSize after plotting.
A somewhat more complicated way is to change the default:
figure('DefaultAxesFontSize',18)
plot(x,y)
Does that make sense?
  1 Comment
Rik
Rik on 9 Feb 2017
The point is that the font size property is inherited from the figure. So instead of calling gca, you should call gcf. But indeed, best practice is setting the font size on creation of the figure window.

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José Crespo Barrios
José Crespo Barrios on 10 Feb 2016
set(findall(gcf,'-property','FontSize'),'FontSize',18)
  5 Comments
Mauricio Iwanaga
Mauricio Iwanaga on 15 Apr 2021
Many thanks. It worked perfectly fine to my case. Apparently, change fontsize in Matlab text function is not so trivial, but your tip works really good (I'm using Matlab R2021a).
Image Analyst
Image Analyst on 16 Apr 2021
@Mauricio Iwanaga I'm not sure of your definition of "trivial", but the text() function also has a 'FontSize' option:
text(x, y, str, 'FontSize', 18, 'FontWeight', 'bold');
It seems pretty trivial to me to use it, once you know that that input option is available.

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Image Analyst
Image Analyst on 27 May 2014
Usually you can set the font size on every control individually as you update its text, like
title('This is my plot', 'FontSize', 24);
xlabel('x axis', 'FontSize', 24);
text(x, y, 'Hey, look at this', 'FontSize', 24);
What's wrong with doing it like that? That's what I do.
  5 Comments
Image Analyst
Image Analyst on 29 May 2014
I don't know. That's bizarre. You should call tech support.
Peter
Peter on 27 Sep 2016
well, probably this font is not available in other sizes

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Sean de Wolski
Sean de Wolski on 27 May 2014
I think what you want to do is set the 'Default' font size for the axes
set(gca,'DefaultTextFontSize',18)
Now any text object on that axes will have 18 font
text(0.5,0.5,'hello')
  4 Comments
Image Analyst
Image Analyst on 11 Feb 2020
Or, since r2014b, you can do it without the set() function:
ax = gca;
ax.DefaultTextFontSize = 18;
DN7
DN7 on 18 Dec 2020
If gca does not work for you, make sure you didn't accidentally create a variable named that way. use:
clearvars gca
h_gca=gca;
h_gca.FontSize=13;
to ensure that. I accidentally created this variable (struct) when I ran gca.FontSize = 13, which does not change the font size of the current axis, but instead creates a new struct.

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Daniel
Daniel on 26 Mar 2015
I just wanted to weigh in on this given I've spent the last couple of hours looking into this.
I am running Matlab 2013b on Ubuntu 12.04LTS. Similar as many here, changing labels/legend properties works fine but setting the axis ticklabel fontname/size was not working - at least, the axis property list reflected the change, but the window plot was not rendering to the new font settings. After printing the plot to eps and including this in my latex compiled document, it turns out the axis font properties were changing. It would appear to be just a rendering bug.
Installing additional fonts did not work for me - and I did not expect to, since rendering/changing font properties of other objects such as labels and legends worked fine in Matlab.
So for those of you cocnerned with the looks of your plots for publications, it would appear to me that the actual exported figures do reflect the editing (at least this was my experience when printing to .eps).
Cheers,
Daniel

Renato Campana
Renato Campana on 18 Nov 2017
Im working with Matlab 2016. You can tried two things:
1)figure('DefaultAxesFontSize',30); % here the font size is 30. figure (1) plot(x,y,'LineWidth',4); % note that the linewidth here is 4 xlabel('length bar','FontSize',18); % note that the font size label here is 18 ylabel('wide bar','FontSize',18); % note that the font size label here is 18
and you must to use the dame command figure('DefaultAxesFontSize',30) in each figure. If you dont specified the font size in each label, the labels shows the size in "30"
Or you can tried:
2) figure (1) plot(x,y,'LineWidth',4); set(gca,'FontSize',28); % please, note that the font size is AFTER the plot command :)

Anu
Anu on 1 Jan 2015
I have also encountered the same problem. I was using Linux Mint OS. I solved it by installing the xfont 100 and 75 dpi and the truetype fonts. Try it out once.

Image Analyst
Image Analyst on 10 May 2020
Moved: Image Analyst on 18 Apr 2023
Here is code that shows you how to change just about anything about the axes that you want:
% Demo to make a black graph with blue title, red Y axis, green X axis, and yellow grid.
% Initialization steps:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clearvars;
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 24;
% Create sample data.
X = 1 : 20;
Y = rand(1, 20);
plot(X, Y, 'gs-', 'LineWidth', 2, 'MarkerSize', 10);
grid on;
title('Y vs. X, Font Size 12', 'FontSize', 12, 'Color', 'b', 'FontWeight', 'bold');
% Make labels for the two axes.
xlabel('X Axis, Font Size 15');
ylabel('Y axis, Font Size 24');
yticks(0 : 0.2 : 1);
% Get handle to current axes.
ax = gca
% This sets background color to black.
ax.Color = 'k'
ax.YColor = 'r';
% Make the x axis dark green.
darkGreen = [0, 0.6, 0];
ax.XColor = darkGreen;
% Make the grid color yellow.
ax.GridColor = 'y';
ax.GridAlpha = 0.9; % Set's transparency of the grid.
% Set x and y font sizes.
ax.XAxis.FontSize = 15;
ax.YAxis.FontSize = 24;
% The below would set everything: title, x axis, y axis, and tick mark label font sizes.
% ax.FontSize = 34;
% Bold all labels.
ax.FontWeight = 'bold';
hold off

vimal kumar chawda
vimal kumar chawda on 12 Aug 2020
figure(4)
set(gca,'FontSize',50)
plot(A_OBS(2).RxTime(:)/3600, No_ele2(1:r2, 1), '.b');
hold on;
plot(A_OBS(4).RxTime(:)/3600, No_ele4(1:r4, 1)-0.05, '.g');
xlabel('Time [h], Font size 15');
ylabel('Number of visible satellites,Font size 15');
title('Comparison between Javad and u-blox receivers (Gallileo)');
legend('Javad(SN:0082)','u-blox(SN:1771)');
Why it is not working ?
I need to maximize the scale and the text in the axis scale.
  2 Comments
Elias Salilih
Elias Salilih on 4 Aug 2023
I understood that font size of axis numbers can be changed with "set(gca,'FontSize',50)", how about font size of a double axis plot (I mean plotyy)
DGM
DGM on 4 Aug 2023
The plotyy() function creates two axes objects. You can set their properties separately.
x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
hp = plotyy(x,y1,x,y2); % get axes handles
% set properties of each axes
% i'm going to use different sizes for sake of clarity
hp(1).FontSize = 8; % controls xruler and LH yruler
hp(2).FontSize = 16; % controls RH yruler

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Eitvydas Karauskas
Eitvydas Karauskas on 4 Apr 2021
Hey guys, I have a different problem with text function. Why does my text size changes when I zoom in or out of my graph? I need to put text at a fixed sized, so it doesn't change when I zoom in or out. I'm adding my code.
Thanks for help ;)
%defining latitude and longitude
latlim=[53.9 55.5];
lonlim=[24 26];
%loading world map
map=worldmap(latlim,lonlim);
%loading lithuania borders from external source and displaying it as a
%geografic coordinates
country=shaperead('gadm36_LTU_0.shp','usegeocoords',true,'BoundingBox', [lonlim', latlim']);
geoshow(map,country,'facecolor',[1 1 1],'linewidth',2);
%converting coordinates to lat/lon
%defining VNO
VNOlon = 25.293639;
VNOlat = 54.636056;
geoshow( VNOlat, VNOlon, 'marker','.', 'markerfacecolor','blue','markeredgecolor','blue','markersize',6);
textm(VNOlat,VNOlon, 'VNO','fontweight','bold','color','black','fontsize',6);
%converting km to nn and defining radius
r = [ 9.26 18.52 27.78];
circlem(VNOlat,VNOlon,r,'linestyle','--','linewidth',0.5);
%defining radius from VNO
textm(54.65831449445, 25.14947845266, '5nm VNO','rotation',70,'fontsize',3,'fontunits','normalized');

Michael Neely
Michael Neely on 20 Nov 2021
None of the above answers on using a single line to "set gca" or "set default" actually work. I have had success setting the fonts in individual print commands (as some of the answers suggest). However, it is quite annoying that there is no simple way to put one line that changes the font size for everything.
The only way I can do it is to physically operate on the figure itself, clicking and enlarging, and this seems to be highly dependent on the size of my window that I use to display the figure. If I physically enlarge the window then the fonts might be modified. This makes it very difficult to consistently print figures for a publication. Some figures will have font sizes slightly different than others.
  2 Comments
Romanos Sahas
Romanos Sahas on 3 Oct 2022
Edited: Romanos Sahas on 3 Oct 2022
Assuming that you have used 'text(...)' while creating your figure and it is the resulting labels that you want to target, here is a fix which worked for me.
g = gcf;
set(findall(g,'Type','text'),'FontSize',14)
Adam Danz
Adam Danz on 3 Oct 2022
@Romanos Sahas, starting in MATLAB R2022a, you could use the fontsize function to do exactly that:
fontsize(gcf, 14, 'points')
For a review, see this Community Highlight.

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Joseph Rojas
Joseph Rojas on 22 Nov 2022
The resolution of my video card and monitor makes the size of fonts in Matlab too small to read. How can I increase the size of fonts in the desktop only for Matlab app. Using Win 11
  2 Comments
Image Analyst
Image Analyst on 22 Nov 2022
Did you check the Preferences button on the Tool ribbon? Or, like with any windows program, hold down the ctrl key while you spin the mouse button.
Adam Danz
Adam Danz on 23 Nov 2022
S = settings();
S.matlab.fonts.codefont.Size.TemporaryValue = 14; % fontsize (points)
This will persist until you close MATLAB so you could put this in your startup function if you want this to take affect every time you open MATLAB.
Revert to default using
clearTemporaryValue(S.matlab.fonts.codefont.Size)

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