Universal Design for Learning (UDL): Accessible Video Design

• Include captions and transcripts for video and audio, and descriptive alternative text for images.
• Avoid using color alone to convey information; if unavoidable, use a color contrast checker.
• Avoid animations, but if using them, describe them sufficiently.
• Avoid the use of Flash; use HTML 5.0 instead.
• Avoid bright, flashing graphics that may cause photo epileptic seizures.

Use the YouTube captions editor
Go to your Video Manager.
Next to the video you want to edit captions for, click Edit > Subtitles and CC.
Click on the caption track you want to edit.
Select a specific line in the caption track panel: On your keyboard, press the up or down arrow to adjust timing. ...
Click Save changes.