How to Write a YouTube Video Description

The first two lines are the only ones most people read. YouTube truncates the description after roughly 100–150 characters behind a "more" link, and those visible lines also appear in search results. Say what the video delivers, in plain language, immediately. Everything else — links, timestamps, credits, socials — goes below the fold where it belongs.

The field holds 5,000 characters. Almost nobody needs them, and filling them with keywords is a policy violation rather than a tactic.

A structure that works

In order, top to bottom:

1. One or two sentences on what the viewer gets. Visible without clicking "more". Include your main phrase if it reads naturally — forced keywords read like spam to both humans and YouTube.
2. Chapters, if the video is long enough to need them. First timestamp must be 00:00, minimum three, each at least 10 seconds.
3. A short expansion. Two or three sentences of context, or the key points. This is where legitimate secondary phrases fit naturally.
4. Links that matter. Resources mentioned, the product used, the previous video in the series.
5. Credits and disclosures. Music, collaborators, and any affiliate or sponsorship disclosure — required, not optional.
6. One to three hashtags. Up to three appear above your title. More than fifteen and YouTube ignores all of them.

What the description actually affects

It's often oversold. What it genuinely does:

• Helps YouTube categorise the video. Real, but a supporting signal rather than a decisive one.
• Appears in search results. The first line or two is snippet text — it affects whether someone clicks.
• Feeds chapters and key moments. Correctly formatted timestamps become navigation.
• Carries your links. The only place they live.

What it doesn't do: rescue a weak title or thumbnail, or make a video rank for a phrase the video doesn't serve. A perfect description on a video nobody clicks changes nothing.

The mistakes worth avoiding

• Keyword stuffing. A wall of comma-separated terms can get a video demoted. This is explicitly against YouTube's policies, not a grey area.
• The same template on every video. If your first two lines are identical channel boilerplate across 200 videos, you've wasted your most valuable copy 200 times.
• Links above the fold. A wall of socials before you've said what the video is about costs you the snippet.
• Broken timestamps. Miss 00:00, use fewer than three, or make one shorter than 10 seconds and YouTube silently discards the entire chapter list.
• Undisclosed sponsorship. A legal problem, not a style one.
• Leaving it empty. Rare but real — it forfeits the snippet, the chapters and the links for no gain.

How long should it be?

As long as the video needs and no longer. A five-minute tutorial might need 300 characters plus links. A two-hour interview benefits from chapters, a summary and references, and might legitimately run to 2,000.

Length is not a ranking factor. Padding a description to hit a word count adds nothing; the useful constraint is the first 150 characters, which you should treat as expensive.

Read the descriptions that already work

The fastest way to improve is to look at how the top results for your target phrase structure theirs. Descriptions are public, so this is just reading. Look for: how they open, whether they use chapters, where the links sit, and how many hashtags they use.

You're copying the structure, not the words.

FAQ

How long can a YouTube description be?

5,000 characters, including spaces. Only the first 100–150 show before the "more" link, so treat those as the real budget.

Do YouTube descriptions affect ranking?

They help YouTube understand the topic, which is a supporting signal. They matter far less than the title, thumbnail and retention. Write them well; don't expect them to carry a video.

Should I put keywords in the description?

Your main phrase, once, in the first sentence, if it reads naturally. Beyond that, write for humans. Stuffing keywords is a violation and can get the video demoted.

How many hashtags should I use in a description?

One to three. Only the first three display above the title. Use more than fifteen and YouTube ignores every one of them.

How do I add clickable links to a description?

Paste the full URL including https:// and YouTube makes it clickable automatically. Links won't work on channels that haven't yet met YouTube's verification requirements.

Can I see and copy another video's description?

You can read any public description — the Description Extractor pulls it with its links and timestamps separated out. Use it to study structure, not to republish someone's copy.

Next steps

• Draft one with the Description Generator.
• Study competitors' structure with the Description Extractor.
• Add navigation with the Chapters Generator.
• See where descriptions sit in the priority list: YouTube SEO.