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How do I write a full SEO YouTube description from my title, keyword, summary and timestamps?
Open AnyTool AI YouTube Description Generator, type your video title and primary keyword, write a short summary of what the video covers, add your channel name, paste your timestamps as “time label” lines, add a subscribe link, social and product links, pick a call to action and your hashtags, and optionally turn on an affiliate disclosure. As you type, the tool ASSEMBLES a structured, SEO-friendly description: a keyword-led hook front-loaded into the first ~150 characters (what YouTube shows above “Show more” and in search), a summary paragraph, a “TIMESTAMPS / CHAPTERS” block that sorts your stamps, reformats every timecode and guarantees a 0:00 start so YouTube can auto-create chapters, a “LINKS” block (subscribe, socials and products with an FTC-style affiliate disclosure when enabled), a clear call to action, a keyword line and your hashtags — de-duplicated and capped at 15 because YouTube ignores all of them past that. A live preview highlights the visible first 150 characters and a character count tracks the 5,000-character limit, then you copy the text or download a .txt. It is honest about being a rule-based template generator, not an AI: it runs 100% in your browser, never uploads your inputs, and you should replace every [placeholder] with your real details and keep the hook and keyword in the first ~150 characters.
Keyword-led hook front-loaded into the visible first ~150 characters
Timestamps sorted & reformatted with a guaranteed 0:00 start (auto-chapters need ≥3 in order)
Live preview with the visible hook highlighted + a 5,000-char count meter
Rule-based, not an LLM · 100% in your browser, nothing uploaded
What is
YouTube description
A YouTube description is the text below a video that tells viewers and YouTube’s search what the video is about. It can be up to 5,000 characters, but only the first roughly 100–150 characters show above the “Show more” fold and in search results, so the keyword-led hook belongs there. A strong description front-loads the primary keyword, summarises the video, lists timestamps/chapters (the first must be 00:00 with at least three in ascending order for YouTube to build clickable chapters), includes links and a call to action, and ends with a few relevant hashtags — the first three show above the title, and YouTube ignores all hashtags if there are more than 15.
Generators
Related terms
Hook (above the fold)Video chaptersTimestampsHashtagsCall to action
Frequently Asked Questions
No. Despite the name, it is a rule-based template tool — it arranges the words you type into a best-practice description structure (hook, summary, timestamps, links, CTA, hashtags). It is not an AI or LLM and does not write original copy.
To keep the product promise of being 100% client-side with nothing uploaded, AnyTool’s YouTube description tool uses no AI, LLM or server — it is a transparent rule-based / template engine. It takes your video title, primary keyword, summary, channel name, timestamps, links, chosen call to action, hashtags and an optional affiliate toggle, and assembles them into a proven layout: a keyword-led hook in the first ~150 characters, a summary paragraph, a sorted “TIMESTAMPS / CHAPTERS” block with a guaranteed 0:00 start, a “LINKS” block with an FTC-style affiliate disclosure when enabled, a clear call to action, a keyword line and capped hashtags. It does not invent original marketing copy or understand your video, so treat the output as a strong, well-structured first draft: replace every [placeholder] with your real summary and links, keep the hook and keyword in the first ~150 characters, and edit it in your own voice.
The limit is 5,000 characters, but only the first ~100–150 characters show above “Show more” and in search, so front-load your keyword and hook there. A focused 200–500 words is a good target.
YouTube allows up to 5,000 characters, but most viewers only ever see the first roughly 100–150 characters — that is what appears above the “Show more” fold and in search snippets, and YouTube’s algorithm weights it heavily, much like a meta description. So put your primary keyword and the most compelling line first. For the full description, a focused 200–500 words (about 1,000–2,500 characters) is plenty for most videos: a summary, timestamps, links, a call to action and hashtags. The generator highlights exactly which characters are visible above the fold and shows a live character count against the 5,000 limit so you can keep the hook tight and the whole thing within bounds.
Add at least three timestamps in ascending order, the first being 00:00, each chapter at least 10 seconds long, in M:SS format. The generator sorts your stamps and guarantees a 0:00 start automatically.
YouTube turns timestamps in your description into clickable video chapters when three rules are met: the first timestamp must be 00:00, you list at least three timestamps in ascending order, and each chapter is at least 10 seconds long. Write each as a timecode followed by a short, descriptive label (for example “1:12 Setup + settings” rather than “1:12 Talking”). In this tool you paste your timestamps as “time label” lines and the engine parses them, sorts them into ascending order, reformats every timecode (M:SS, MM:SS or H:MM:SS) and inserts a 0:00 “Intro” chapter if you forgot one, then tells you whether the result qualifies for auto-chapters. Chapters make long videos skimmable and can lift average view duration.
Use about 3–5 relevant hashtags; the first three show above your title, and YouTube ignores ALL of them if you use more than 15. The tool is free, runs entirely in your browser, and never uploads your inputs.
Add a few genuinely relevant hashtags — 3 to 5 is plenty. The first three appear above your video title, so make those count, and never exceed 15 hashtags because YouTube then ignores every hashtag on the video. The generator de-duplicates your hashtags and caps them at 15 automatically, and warns you if you go over. On privacy, the whole description is assembled locally: your title, keyword, summary, channel name and links never leave the browser, nothing is uploaded, logged or stored, and the page works offline once cached — unlike many online description tools that send your inputs to a server or a hosted AI model. It is completely free with no signup.
Detailed Explanation
⚙️Methodology
How the AI YouTube Description Generator Works (Rule-Based, Not an LLM)
Despite the “AI” in its name, AnyTool’s YouTube description tool uses no AI, LLM, server or network call — it is a transparent, rule-based template engine that runs entirely in the browser. It takes the creator’s own inputs (video title, primary keyword, a short summary, channel name, a textarea of “time label” timestamp lines, a subscribe link, social and product links, a chosen call-to-action phrasing, hashtags and an affiliate toggle) and ASSEMBLES them into a best-practice, SEO-friendly description layout. The layout follows documented YouTube guidance: a keyword-led HOOK front-loaded into the first ~150 characters (what shows above the “Show more” fold and in search, weighted by the algorithm like a meta description), a SUMMARY paragraph, a “⏱ TIMESTAMPS / CHAPTERS” block, a “🔗 LINKS” block, a clear CALL TO ACTION, a keyword line and HASHTAGS. The timestamp parser reads each line, extracts an H:MM:SS / M:SS / MM:SS timecode and its label, sorts them in ascending order, de-duplicates identical times and inserts a 0:00 “Intro” chapter if one is missing — because YouTube only builds clickable chapters when the first stamp is 00:00, there are at least three in order, and each is at least 10 seconds. Hashtags are normalised to clean #tags, de-duplicated case-insensitively and capped at 15 (YouTube ignores every hashtag past that), and the whole output is trimmed to YouTube’s 5,000-character limit. It does not write original marketing copy: any [placeholder] the user leaves blank stays as a bracketed prompt to fill in.
Rule-based template engine — no AI, LLM, server or network call
Assembles a hook, summary, timestamps, links, CTA, keyword line and hashtags
Timestamps sorted & reformatted with a guaranteed 0:00 start for auto-chapters
Hashtags de-duplicated & capped at 15; output trimmed to the 5,000-char limit
Honest: it does not understand the video or invent original copy
📋Use Cases
Description Structure, the Visible Hook, Chapters and Hashtags
The engine encodes the structure that high-performing YouTube descriptions share. The first ~100–150 characters are the only part most viewers see (above “Show more”) and the part search weights most, so the tool front-loads the primary keyword and video title into that hook and visually highlights exactly which characters are visible in the live preview, alongside a hook character counter. A focused summary of 200–500 words is encouraged, with the keyword used naturally. Timestamps become clickable chapters only under YouTube’s rules (first stamp 00:00, at least three in ascending order, each ≥10s), and chapter labels should read like titles (“1:12 Setup + settings”) not transcripts; the tool reports whether the parsed stamps qualify for auto-chapters. The links section lays out a subscribe link, socials and products, and can insert an FTC-style affiliate disclosure — the FTC requires a clear written disclosure in the description (plus on-screen / verbal) whenever links are affiliate or paid, and ticking YouTube’s paid-promotion box alone does not satisfy it. Hashtags are capped at 15 because YouTube ignores all of them past that, and only the first three render above the title, so 3–5 relevant tags is the recommendation. A live 5,000-character meter, chapter and hashtag counts, and one-click copy or .txt download round it out.
First ~150 chars are the visible hook (above “Show more” + in search) — keyword goes there
Auto-chapters need a 0:00 first stamp, ≥3 in order, each ≥10 seconds
FTC-style affiliate disclosure; the paid-promotion checkbox alone is not enough
Hashtags: first 3 show above the title; YouTube ignores all if there are >15
Live preview with highlighted hook, 5,000-char meter, copy & .txt download
⚠️Limitations
Honest Limits and Privacy
Because the engine is rule-based, it does not understand the video, the audience or what will actually earn views — it formats the words the user types into a proven structure and nothing more. It does not write original marketing copy, so any [placeholder] left blank stays as a bracketed prompt, and the output is a strong, well-organised first draft the creator is expected to edit in their own voice. The description must honestly match the video: a misleading hook or over-promising summary hurts watch time and trust. On privacy, all assembly is local: the video title, keyword, summary, channel name, timestamps and links never leave the browser, nothing is uploaded, logged or stored, and the page works offline once cached — in contrast to many online description tools that send inputs to a server or a hosted AI model.
Not an AI — it assembles your inputs, it does not write original copy
Replace every [placeholder] with your real summary and links
Keep the hook + keyword in the first ~150 chars; make it match the video
Inputs and the assembled description stay on-device — nothing uploaded
AnyTool assembles every description locally and is honest that it is a rule-based template engine, not an AI that writes copy for you — fill in the [placeholders] with your real summary and links, keep the hook and keyword in the first ~150 characters, and make sure the description honestly matches the video.
