AI YouTube Description Writer
Search only shows the first two lines. Chapters keep the rest worth scrolling for, if YouTube accepts them.
FreeNo sign-upPlatform-aware output
Fill in the fields and press Generate. The output streams in here and stays in your browser.
YouTube shows roughly the first 100 to 150 characters of a description in search results and above the fold on a watch page, then hides the rest behind a show more link. The description is indexed as well, so those opening characters do two jobs at once: they summarize the video for a person and carry the keyword the video should rank for. Most descriptions do neither.
Use it for a tutorial, a review, a vlog, or anything with chapters. Chapters need a timestamp at 0:00 and at least three entries, each at least ten seconds long, or YouTube ignores them entirely. Paste the real title and a plain summary, and the generator builds the structure around them.
What the youtube description writer gives you
01The keyword sits inside the visible 150
The first sentence carries the primary keyword in natural phrasing rather than after a show more link. Search results and the collapsed watch page read that opening, so it decides whether the description appears relevant.
02Chapters that YouTube will actually accept
Every chapter list starts at 0:00, runs at least three entries deep, and uses labels short enough to fit the scrub bar. A list that misses the zero mark is silently ignored, which is a common and invisible failure.
03A link block that does not read as spam
Links go in a labelled section at the bottom with placeholders rather than invented URLs. That keeps the description clean, avoids broken links, and leaves the top of the text for the part that search reads.
04Written for search first, then for viewers
The body expands on what the video covers in plain sentences, so it matches queries the title does not. Keywords appear once each, in context, instead of being stacked at the bottom where they read as manipulation.
When to use it
One shoot, a week of posts
Photograph once, then write the carousel caption, the Reel hook, the story text and the newsletter line from the same material. Each platform gets the length and register it actually rewards.
Fixing a post that flopped
If a post died, the cause is usually the first line or the missing reason to care. Rewrite the hook and the ask, keep the body, and test again rather than starting from scratch.
Keeping one voice across platforms
The same person sounds different on LinkedIn and TikTok, but the through-line should hold. Write both from the same brief so the voice drifts less than it does when you improvise each one.
How it works
- 1
Paste the real title
The description has to support the title rather than repeat it. Copy the exact title you published so the keyword choice matches what the thumbnail promises.
- 2
Summarize in plain language
List what the video actually covers, in the order it happens. A summary written as bullet fragments produces a description that reads like a spec sheet rather than a page.
- 3
Check the chapters against the cut
The generator writes plausible timestamps, but only your edit knows the real ones. Replace them after the final cut, keeping 0:00 and the ten-second minimum between marks.
Frequently asked questions
How long should a YouTube description be?
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Between 200 and 400 words covers most videos. The field allows 5,000 characters, but length is not the goal: the first 150 characters carry the search snippet and the rest exists for chapters, links and context. A short description with real chapters beats a long one with none.
What are the rules for YouTube chapters?
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The first timestamp must be 0:00, there must be at least three timestamps, and each chapter has to run at least ten seconds. The labels also have to be on their own lines. Miss any of those and YouTube ignores the whole list without telling you.
Do hashtags belong in the description?
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Up to three, and only if they are relevant. The first three hashtags in a description appear above the video title, so a fourth is invisible and a bad first one is worse than none. Skip them for most tutorials and use them for series or events.
Does the description affect ranking?
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It is one signal among many, and a weak one compared with watch time. What it does well is match queries the title and tags miss, and give search a clean summary to quote. Treat it as a relevance signal, not as a lever that can rescue a video nobody watches.
Can I use the same description for every video?
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No. Duplicate descriptions across a channel give search nothing to distinguish one video from another, and the channel starts to look templated. Keep the links block identical if you like, but the opening two lines must be specific to the video.
Where should the links go?
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Below the chapters, in a short labelled block. Links above the fold push the summary down and compete with the keyword sentence. One link to a newsletter, one to a related video and one to socials is usually enough for a channel of any size.
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