Shotcut is an excellent free video editor that allows you to add plain text or 3D text into your video/ clip by using Filter. You can also adjust the size, position, color of your text easily.
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This tutorial video will show you how to add and adjust 3D text and plain text into your video.
Shotcut is a free, open source, cross-platform video editor for Windows, Mac and Linux. Major features include support for a wide range of formats; no import required meaning native timeline editing; Blackmagic Design support for input and preview monitoring; and resolution support to 4k
There is another free & easy option to add text, closed caption and subtitle to your video is to use ActivePresenter. Learn more..
You can read our full review about Shotcut here!