You can easily do this with the built-in tool of iOS.

  • Go to Settings of iOs

  • Drag down on the list to bring out the search bar. Type Zoom (see image below)

  • Turn on "Zoom"

Now, you can double tap using 3 fingers to bring out the magnifying glass.

Double tap and hold your 3 fingers, then slide up to zoom in.

To resize the magnifying glass, you can triple tap using 3 fingers.

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