Why use a structure for descriptions?
A description does two jobs. The first couple of lines are what viewers see before they expand it, so they need to say plainly what the video offers. YouTube's own advice is to use those first lines to describe the video, and to save channel information and extra links for later in the description. The rest of the description is reference material: chapters, the links you promised in the video, and credits for music or footage you used with permission.
Building each description from the same blocks keeps them consistent. It also stops you forgetting the link you said would be "in the description". The builder puts the blocks in a sensible order, adds plain headings ("Chapters:", "Links mentioned:", "Credits:") and leaves out any block you leave empty.
Limits the builder checks
- 5,000 characters. This is YouTube's maximum length for a video description. The counter turns into a warning if you go over.
- Hashtags. YouTube shows up to three hashtags from your description beside the title, and says it ignores all of a video's hashtags if there are more than 60. The builder adds the # for you, strips spaces and punctuation, and warns you if the list is getting long.
Titles are limited separately to 100 characters, so they aren't part of this tool.
Good habits
- Make every description unique. Copying the same text onto every video makes them harder to tell apart in search.
- Only add hashtags that relate to the video. YouTube's policies treat misleading or unrelated hashtags, and long lists of tags, as metadata abuse.
- Credit music and footage in the form the licence asks for. Some free music libraries specify exact wording.
- Revisit old descriptions when links change, so viewers don't land on dead pages.
For a full walkthrough with an example layout, read how to write YouTube descriptions. Everything you type stays in your browser.