To change the font size of your device, open the “Settings” app or the “Personalization” section. Then, go to “Font Size” and select the font size you want to use. This process has slight variations depending on the device you are using.
Step
Method 1 of 3: Samsung Galaxy Devices

Step 1. Swipe down from the top edge of the screen

Step 2. Press the Settings button
The shape resembles a gear.

Step 3. Press the View button

Step 4. Press Fonts

Step 5. Press and drag the Font Size slider

Step 6. Press "Done" to save changes
Method 2 of 3: LG and Nexus devices

Step 1. Swipe down from the top edge of the screen

Step 2. Press the Settings button
The icon is a gear.

Step 3. Press Display
It is located in the Devices section.

Step 4. Press Font Size

Step 5. Press the font size you want
Method 3 of 3: HTC Device

Step 1. Press the App Drawer button
It's shaped like a box at the bottom-center of your screen.

Step 2. Tap the Settings app

Step 3. Tap Personalize

Step 4. Press Font Size

Step 5. Tap the font size you want to use
Tips
- Not all apps follow the system font size setting.
- The largest font size may not work in all apps.