There is a free version of this app available: Font Size https://play.google.com/store/apps/details?id=com.bytesculptor.fontsize


Do you prefer a big font for better readability?
Do you prefer a small font to have a better overview on the screen?
Do you prefer both and would like to change quickly?

The Android system has 4 fixed sizes only. With this app you can change the size from 65% to 250%.

Features:
► Very simple to use
► Shrink enlarge and adjust the font size with one click
► Save 5 different font sizes
► See a preview of the font size
► Restore the default size with one click
► No phone restart needed after change (Android 7 and up)


Further more:
✔ Little download size small use of storage
✔ Works on smartphones and tablets


To use this app you have to agree to write system settings otherwise it is not possible to change the font size. The app will prompt you for permission on its start.

A font size smaller than 80% is not possible on some Samsung devices.