Direct answer: These are two separate fields. A video description holds up to 5,000 characters and works in two halves: the first few lines everyone sees, and everything after "Show more" (or "more" on mobile). A channel description is edited in YouTube Studio under Customization and then Profile, and YouTube's page, read on 19 August 2026, says it is accessible in the channel header, alongside translations, contact info and up to 14 channel profile links. Chapters come from the video description itself: the first timestamp must be 00:00, at least three timestamps in ascending order, each chapter at least 10 seconds.
- The video description is capped at 5,000 characters, and YouTube asks for a unique description on every video.
- The first lines are the only part most viewers read, so the actual description of the video goes there.
- Chapter rules are exact: 00:00, three or more ascending timestamps, 10 seconds minimum per chapter.
- External links in a long-form description become clickable only once your channel has access to advanced features, and links in Shorts descriptions are never clickable.
- YouTube publishes no character limit for the channel description and no "ideal length" for a video description.
The video description: two halves around "Show more"
The "Tips for video descriptions" page (read 19 August 2026) says the description tells the YouTube algorithm and your viewers what the video is about, and splits it into what viewers see before clicking "Show more" on desktop or "more" on mobile, and what they see after. It recommends using the first few lines to describe the video, because that is what viewers see first. The field allows a maximum of 5,000 characters, and every video should carry a unique description, which makes it easier to find in search and helps it stand out from similar videos.
| Part | What belongs there | Who sees it |
|---|---|---|
| Before "Show more" | What the video actually covers, in the viewer's words, with the one or two main terms | Everyone who opens the watch page |
| After "Show more" | Chapters, playlist links, credits and channel mentions, standing channel info | Viewers who expand the description |
On the words themselves, the official page gives three instructions: identify one or two main words that describe the video and feature them in both the description and the title; use the Research tab in YouTube Analytics and Google Ads Keyword Planner to find popular terms and their synonyms; and pretend you are searching for your own video, because whatever you would type into the search bar belongs in the description. Search terms are matched with the video and the text in the description, and the "How viewers find your" report shows the terms people actually used. How relevance, engagement and quality fit together is covered in the YouTube SEO guide and in the YouTube algorithm guide.
The line between useful and spammy is drawn on the hashtags page, which prohibits "ordinary descriptive tags or repetitive sentences in the description" outright: keywords inside real sentences are fine, a block of comma-separated terms at the end is not.
Chapters: the official requirements
Chapters break a video into sections, each with its own preview, and they are created from the description. The rules on the Video Chapters page (read 19 August 2026):
- The first timestamp in the list must start at 00:00.
- You need at least three timestamps, listed in ascending order.
- The minimum length for a chapter is 10 seconds.
- One line per chapter: timestamp, a space, then the chapter title, for example 00:00 Intro.
To add them: YouTube Studio, then Content, click the video, add the list in the description, then SAVE. A manual list overrides automatic chapters, and the "Allow automatic chapters" box is checked by default for new uploads, which you can uncheck per video or in your upload defaults. Not every video is eligible for automatic chapters, and if the channel has any active strikes, or the content may be inappropriate for some viewers, the feature is not available. If you have no chapters yet, the page tells you to apply for access to advanced features.
Which links in a description are clickable
This is where most older guides, including our own previous version of this page, got it wrong. The "Sharing links with your audiences" page (read 19 August 2026) publishes a table:
- URLs in long-form comments and descriptions are clickable, with a footnote spelled out on the page: to add clickable external links you must enable your channel's access to advanced features. The gate is advanced features, not the YouTube Partner Program.
- URLs in Shorts comments and Shorts descriptions are non-clickable, which the page attributes to reducing spam and scam attempts. Mentions and hashtags in Shorts stay clickable.
- Channel profile links are clickable, up to 14 of them.
- Channel descriptions during live streams are clickable in the horizontal experience and non-clickable in the mobile app's vertical live feed.
Every link is also governed by the external links policy (read 19 August 2026): links to content that violates the Community Guidelines are not allowed, across video, audio, channel, comments, pinned comments and live streams. It counts obfuscated links ("dot com" instead of ".com") and even verbally directing viewers to another site. The same page notes that affiliate content does not violate the Terms of Use by itself, while excessively posting it from dedicated accounts may breach the spam policy.
If you name another channel with an @ mention, that channel gets a notification, and the mentions page states plainly that mentioning your channel name or handle in someone else's video does not increase the likelihood of their video reaching your fans. Mentions are a credit, not a distribution tactic.
Hashtags and disclosures inside the description
Hashtags belong here only as a placement question: they go in the title or the description, up to three appear above the title, and more than 60 on one video means every hashtag is ignored. The mechanics and policies are in the YouTube SEO guide; what matters here is that they sit at the end of the description rather than competing with your first lines.
Paid promotion is a different kind of line item. YouTube's page (read 19 August 2026) requires you to declare it by checking the paid promotion box in the video details: YouTube Studio, Content, the video, More options, then the box confirming the video contains a product placement, sponsorship or endorsement, then SAVE. The page also states that creators and brands are responsible for the legal disclosure obligations in their own jurisdiction, including when, how and to whom to disclose. A "sponsored by" line in the description is good for viewers, but it does not replace the checkbox.
Description templates by video type
A template saves time on the second half; the first lines get rewritten every time. The orders below are editorial:
- Tutorial: two lines naming the problem and the outcome in search language, then chapters, then the tools mentioned, then the series playlist.
- Review: one line naming the product and the question answered, then chapters per criterion, then any disclosure, then related reviews.
- Vlog: two lines on where and what, then chapters for the stops, then music credits, then the previous episode.
- Interview or podcast: one line on the guest and topic, then chapters per subject, then an @ mention of the guest's channel, then listening links.
- Shorts: one line explaining the idea plus a hashtag or two, and no clickable links, so name the long-form video instead.
The channel description (profile)
The "Manage your YouTube channel's profile" page (read 19 August 2026) puts channel identity in one screen: YouTube Studio, then Customization, then Profile. Enter the description, click PUBLISH, and keep it within the Community Guidelines. The page says the description is accessible in the channel header, so it is part of what a visitor reads before deciding to subscribe. Three fields on the same screen matter as much as the text:
- Translations: ADD LANGUAGE sets an original language and adds a translated channel name and description, the supported way to serve a bilingual audience instead of stacking two languages in one box.
- Links: up to 14 links on the Home tab; the first is displayed prominently near the subscribe button, the rest appear when the viewer clicks to see more, and all must follow the external links policy.
- Contact info: an email address for business questions, added in the same panel.
A workable order for the text itself, editorial rather than official: one line saying who you are, what you publish and for whom; one line naming the two or three content types you actually make, in the words people search for; and your publishing rhythm if you keep one. Links and the business email go in their own fields, not into the paragraph.
Note what the page does not contain: any character limit for the channel description, or any figure for how much of it shows before truncation. Numbers of that kind circulate widely and none come from YouTube. The visual side of the channel (picture, banner, trailer, section order) belongs to the channel branding guide.
Formatting and the default description
The description field displays text only, but it can be formatted: bold, italic, strikethrough, and bullet lists created by starting a line with "*", "+" or "-" followed by a space. On mobile, highlight the text to open the editing bar; on a computer the options sit at the bottom of the box. Filling in the default description adds basic channel information to every new upload automatically, which is how the second half of a description writes itself. Where these fields appear during upload is covered in the guide to uploading your first video. YouTube's closing advice: after publishing, check how the description looks in search, on the watch page and on mobile.
Common description mistakes
- Reusing one description across every video, when the official page asks for a unique one.
- Opening with social links, which spends the lines everyone actually sees.
- Pasting a keyword list at the end, prohibited by name on the hashtags page.
- Timestamps that do not start at 00:00, or fewer than three of them.
- Putting links in a Shorts description and expecting clicks.
Frequently asked questions
How do I write a YouTube description?
Describe the video in the first two or three lines in the words a viewer would search for, including the one or two main terms that also appear in your title, then use the space after "Show more" for chapters, playlists, credits and standing channel information.
What is the maximum length of a YouTube description?
5,000 characters, per the official page (read 19 August 2026). There is no ideal length and no reason to fill the limit if the extra text is not useful to a viewer.
I added timestamps but chapters are not showing. Why?
Check the four requirements: start at 00:00, at least three timestamps, ascending order, and at least 10 seconds per chapter. Then check the two blockers named on the official page: active strikes or content that may be inappropriate for some viewers disable the feature, and some channels need access to advanced features first.
Can I put clickable links in the description?
In long-form videos, yes, once your channel has access to advanced features. In Shorts descriptions and comments, no: YouTube makes those URLs non-clickable.
What should I write in the channel description?
Who you are, what you publish and for whom. YouTube states no character limit and no required format, so make the first two lines legible to someone skimming, and use the dedicated fields for links and contact email rather than pasting them into the text.
Practical summary
- Fill in the channel description first, with links and email in their own fields.
- Write a fresh description for each video, and put the real description in the first lines.
- Chapters: 00:00, three ascending timestamps, 10 seconds minimum.
- Advanced features gate clickable links; Shorts descriptions have none.
- Disclose paid promotion with the official checkbox, not just a line of text.
- The rest of the educational YouTube guides are in the YouTube Resource Hub.
Official sources
- Tips for video descriptions (YouTube Help): the two parts, the 5,000-character maximum, unique descriptions, the one or two main words, formatting and the default description (read 19 August 2026).
- Video Chapters (YouTube Help): timestamp requirements, automatic chapters, and when the feature is unavailable (read 19 August 2026).
- Manage your YouTube channel's profile (YouTube Help): editing the channel description, the channel header, translations, up to 14 links, and contact info (read 19 August 2026).
- Sharing links with your audiences (YouTube Help): which links are clickable, the advanced-features condition, and non-clickable Shorts links (read 19 August 2026).
- External links policy (YouTube Help): what may not be linked and where the policy applies (read 19 August 2026).
- Find playlists and videos using hashtags (YouTube Help): hashtag placement, the 60-hashtag limit, and the "non-hashtags" clause (read 19 August 2026).
- Add paid product placements, sponsorships and endorsements (YouTube Help): the disclosure checkbox and jurisdiction-specific legal obligations (read 19 August 2026).
- Mention channels in video titles and descriptions (YouTube Help): how @ mentions behave, and what they do not do (read 19 August 2026).