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YouTube Description Optimizer

Updated October 2026

A free YouTube description analyzer that scores your description for SEO across seven dimensions. Paste a YouTube URL to import an existing description, see the above-the-fold preview of what viewers see first, and get the one fix that lifts your score the most. No signup, runs in your browser.

0 words
0 charactersYouTube's cap is 5,000 characters.

Name the phrase you want viewers to find the video with and the keyword row scores against it. Leave blank to skip keyword scoring.

What you'll see

Paste or import a description and the optimizer scores it on seven SEO dimensions: the above-the-fold hook, target-keyword placement, depth, chapters, links and call to action, hashtags, and readability. Then it names the one change worth the most points on our score.

Description score

–/100

Paste or import a description to score it.

What to change

Once there is a score, the one change worth the most points shows here.

Above-the-fold hook–
Depth & length–
Chapters & timestamps–
Links & call to action–
Hashtags–
Readability–

Our own rules, not YouTube's. YouTube publishes no description score, and this one does not predict views or search ranking. Analysis runs in your browser; nothing you paste leaves the page. Methodology

How the scoring works

Every weight and cutoff here is our own judgment call, not a figure YouTube publishes. YouTube publishes no description score, so read ours as a guide rather than a verdict.

Checks based on YouTube's own guidance

  • YouTube suggests using the first few lines to describe the video. A first line that is nothing but a link is flagged. A link followed by text, or a short opening, is a suggestion at most.
  • YouTube says descriptions with keywords can help viewers find videos through search. A target keyword that does not appear in the description is flagged.
  • Chapters. We read timestamps at the start of a line (our reading rule). This is checked when you have three or more of them, or one at 00:00. YouTube needs three or more, the first at 00:00, in ascending order, none under 10 seconds.
  • More than 60 hashtags, past which YouTube ignores all of them.
  • More than 5,000 characters, YouTube's limit.

Only these can show a red Fix. Everything else is a suggestion at most.

The Opening Lines Carry the Most Weight

YouTube suggests describing the video in the first few lines, which viewers see first, but publishes no character count for where the cut falls, so we score against a 157-character window as our own working approximation. The above-the-fold hook carries 20 percent, tied with keyword usage as the heaviest dimension, and it becomes the single heaviest at 25 percent when you leave the keyword blank and its weight redistributes. Opening on a link caps the hook score, and a keyword that lands outside our window earns less than one in the opening line.

Keyword Scoring Is Opt-In

Name a target keyword and three signals score it: presence, front-loading inside that same 157-character window, and density, counted as mentions per hundred words however many words the phrase itself runs to. Presence follows YouTube's keyword advice; the window and the density band are our rules of thumb. Density takes full credit from roughly half a percent to 3.5 percent and tapers past that. Leave the keyword blank and its weight redistributes across the other dimensions instead of scoring a zero.

Our Own Rules of Thumb

Depth reaches full marks at 200 words and holds flat to 400 before easing off, so padding cannot outscore a tight description. Neither number comes from YouTube. A handful of links plus one clear ask beats a link dump, and one to three hashtags score best, also our own rules. Chapters and hashtags are optional: leaving them out scores a neutral 70 on that row, never a penalty. Links are optional too: none scores 70, or 80 with a call to action. Under 20 different words (links, hashtags, timestamps, numbers and repeats do not count) there is too little to judge, so the overall score is capped at 40. From 20 the cap rises evenly, 4 points a word, and is gone at 35 different words. Rows built only on our rules never go beyond a suggestion.

Deterministic on Purpose

Every signal is a count or a ratio of your text, such as characters, words or mentions per hundred words, multiplied by its weight and summed into the 0 to 100 overall score. No AI, no network call, so the same description always scores the same way and nothing you paste leaves your browser. The trade: it reads structure, not search demand.

Frequently asked

What makes a good YouTube description for SEO?
YouTube suggests using the first few lines to describe the video, because viewers see those first, and says descriptions with keywords can help viewers find videos through search. YouTube publishes no character count for where the "...more" cut falls, so this tool checks a 157-character window as our own working approximation. The rest of what we check (a real summary, chapters, a few links with a call to action, a few hashtags) is our rule of thumb, not a YouTube requirement.
How long should a YouTube description be?
YouTube allows up to 5,000 characters and sets no length target. Our rule of thumb is 100 words or more, enough to summarize the video, and our score tops out between 200 and 400 words. You do not need to fill the cap. Lead with the important part: YouTube suggests describing the video in the first few lines, which viewers see first. Under 20 different words there is too little to judge, so our overall score is capped at 40, and the cap lifts evenly until it is gone at 35 different words.
Where should I put my keyword in the description?
YouTube says descriptions with keywords can help viewers find videos through search, and suggests featuring your main words in both the description and the title. The optimizer treats a keyword missing from the description as a problem. Where it lands (inside our 157-character window) and how often it repeats (we flag more than about 3.5 mentions per hundred words) are our own rules of thumb, shown as suggestions only.
Do timestamps and chapters actually help?
YouTube says chapters can help viewers skip to the important parts of a video. YouTube documents four conditions for a manual chapter list: at least three timestamps, the first one written as 00:00, listed in ascending order, and no chapter shorter than 10 seconds. YouTube's page states no rule about where on a line a timestamp sits; we read timestamps at the start of a line, after any bullet or emoji. The optimizer treats a description as a chapter list when it has three or more of them, or one at 00:00, and then checks the four conditions. Chapters are optional, so a description without them gets a neutral score, not a penalty.
How many hashtags should I use?
YouTube shows up to three hashtags by the video title and says not to add too many: the more you add, the less relevant each one becomes. Past sixty, YouTube ignores every hashtag on the video, and the optimizer flags that. Our target of one to three specific hashtags is our own rule of thumb, and it lines up with the three YouTube shows.
Is this a replacement for vidIQ or TubeBuddy?
No. This optimizer checks how your description is written. It can't see what people search for, which is the job of a keyword research tool. If you're weighing the two big paid tools, our vidIQ vs TubeBuddy comparison breaks down which fits which kind of channel.