How to write a YouTube description
Summary first
The first lines show under the video and in search. Say what the video covers and use your main keyword naturally.
Chapters
0:00 Intro 1:20 Step one 4:05 Step twoList times in order. The first must be 0:00, you need at least 3, and each chapter must be at least 10 seconds long.
Links and next step
Add the links you mention, then one call to action. The whole description can be up to 5,000 characters.
Frequently asked questions
How long can a YouTube description be?
Up to 5,000 characters. Most good descriptions use a few hundred, with the key point in the first two lines.
Why aren't my YouTube chapters showing?
Check that the first time is 0:00, you have at least 3 times in ascending order, and each chapter is at least 10 seconds.
Should I put keywords in the description?
Yes, in normal sentences. Describe the video clearly; don't paste lists of keywords, which breaks YouTube's spam rules.
Related free tools
Sources: YouTube Help: Add chapters to your videos · YouTube Help: Video description · YouTube Data API: Videos resource