A quick way to try is to use "Ctrl" ("Cmd" on Mac) plus the plus (+) or minus (-) keys when you're in a web browser or...

On Windows, press the Windows key and plus sign (+) at the same time to zoom in. You can also use the "Magnifier" application under "Accessories".

On Mac, go to "System Preferences", open "Universal Access" and select the "Seeing" tab. Check the box under "Zoom" to "On".

On your Apple device, tap "Settings", then "General", then "Accessibility". Tap the "Zoom" button and toggle it "On".

In Chrome, click "Preferences", select "Show advanced settings", then "Web content" and change the "Font size", You can also try to "Customize fonts" or set default "Page zoom" to your preference. 

In Internet Explorer, go to "Tools", then "Internet Options", on to "General". From here, select "Colors, Fonts, or Accessibility".

In Firefox, choose "Options", then "Content", then finally "Fonts & Colors".

In Safari, select "Preferences", "Appearance" tab, and then hit the "Select…" button next to the font fields.

Screen readers are text-to-speech software that allow people to read and interact with page content.

Here are some free options:

NVDA or JAWS for Windows
VoiceOver for Mac.

VoiceOver is/was built in for iOS

To turn on VoiceOver, go to "Settings", then "General", to "Accessibility", and then turn "VoiceOver" on. You can set the “Accessibility Shortcut” to “VoiceOver” from the "Accessibility" page in order to triple-click the "Home" button to toggle VoiceOver on and off. TalkBack has a similar feature. 

"Zoom", "Magnifier", "Invert Colors", "Color Filters", and "Reduce White Point" are other features and tools on iOS that you can use. These are also available through the “Accessibility Shortcut”. 

TalkBack is/was built-in for ANDROID.