Descriptions sit in an awkward spot: they matter much less than titles, thumbnails and retention for ranking — but a bad description quietly costs you clicks, sessions and context. The first 150 characters appear in search results and above the fold; timestamps turn viewers into session time; and the keywords inside still help YouTube categorize the video.
This is the five-part description template we recommend in 2026, what goes in each part, and the outdated tactics to drop.
Part 1: The first 150 characters (the only part most people see)
Treat the opening line like a second title. In search results and when the description is collapsed, only the first ~150 characters show — so lead with the video's promise and primary keyword, not your channel intro or upload date.
Good: 'Learn the 2026 YouTube description formula: what to write in the first 150 characters, where timestamps go, and the SEO mistakes that still cost rankings.' Bad: 'Hey guys, welcome back to the channel! Today we're talking about...'
Part 2: The value stack (lines 2–6)
Next, two to four lines that expand the promise: what the viewer will learn, what they'll walk away able to do, and who the video is for. This is where a skimmer decides whether your video is worth their time — and where related-video algorithms pull context.
Include your primary keyword and two or three natural variations here. Write for humans first; the algorithm reads the same text and extracts topics from it.
Part 3: Timestamps and chapters
Chapters are free session time: they let viewers jump to the section they need (reducing abandonment) and they appear as chapter markers in search and seek bars (improving click-through on long videos). Format: '0:00 Intro', with the first timestamp at 0:00 and a minimum of three chapters for YouTube to display them.
Name chapters with searchable phrases, not 'Part 1 / Part 2'. '3:41 The 150-character rule' tells the algorithm and the viewer what lives there.
Parts 4–5: Links, hashtags and the boilerplate
Part 4 is resources: the tools mentioned, affiliate links (with a plain-language disclosure), your newsletter or lead magnet. Fewer, relevant links beat twenty. Part 5 is three hashtags maximum — YouTube ignores everything past the first three, and more looks spammy.
End with a short boilerplate (two lines max) about your channel. Skip the keyword-stuffed paragraph of fifty tags — that tactic died years ago and can actively trigger spam signals.
Tips
- Rewrite descriptions on your top 10 search-traffic videos using this template — it's the highest-leverage 30 minutes in video SEO.
- Put the most important link first (lead magnet or featured tool), not your socials.
- Match the description's promise to the title's promise to the video's actual content — mismatches kill retention, which kills everything else.
- For series, link the previous and next episodes inline in the relevant chapters section to chain session time.
Common mistakes
- Keyword-stuffing the description — A paragraph of 60 tags doesn't help ranking and can trigger spam classification. Two or three natural keyword uses beat a wall of tags.
- Burying the payoff — If the first 150 characters are filler, searchers skip your video even when it ranks — CTR from search is won in that snippet.
- No timestamps on 8+ minute videos — You're forcing serial abandonment: viewers who can't find the section they need leave, instead of jumping to it and staying.
Example scenario
Illustrative example — not a real customer.
Situation: A 22-minute photography tutorial with no chapters and a two-line description ranking #8 for its keyword.
What changed: Adding keyword-led chapters (12 sections, named with search phrases) lifted average view duration 31% and moved the video to #3 within three weeks — chapters turned skimmers into session time.
Frequently asked questions
How long should a YouTube description be?
150–400 words is the sweet spot. Long enough for context, timestamps and links; short enough that nothing important hides below the fold. The 5,000-character limit is a ceiling, not a target.
Do hashtags in descriptions help?
Marginally — only the first three show above the title, and their ranking effect is small. Use three relevant ones, don't stuff.
Should I include affiliate links in descriptions?
Yes, with a clear disclosure ('Includes affiliate links'). Place them in the resources section and lead with the one most relevant to the video's promise.