Skip to content
Estudio de Canales
Log in
Menu

YouTube Video SEO: Title, Description, Tags and Chapters

· 9 min read · Estudio de Canales

Cover graphic for Estudio de Canales: a diagram of linked steps on a black background, with the article's headline in Spanish

SEO for YouTube videos means making the title, the description and the video itself say clearly what someone is looking for. According to YouTube's help page, its search ranks videos by how well those elements match the query and by the engagement each one generates. Tags carry very little weight.

How YouTube ranks results

YouTube's performance FAQ page explains it plainly: like Google's search engine, YouTube search tries to show the most relevant results based on the keywords entered. To rank videos it takes two factors into account:

  • How closely the title, the description and the content of the video match the search the user makes.
  • Which videos generate the most engagement for each search.

And it adds an important nuance: search results are not a list of the most-viewed videos for each query. The page on tags sums it up in another way: the title, the thumbnail and the description are the main metadata that influence the visibility of your videos.

That is the idea behind this article: SEO for a video is not a trick, it is describing it well. No combination of words guarantees a position, because the second factor, engagement, depends on how people respond to the video.

The title: clear, faithful and 100 characters at most

Video titles have a limit of 100 characters and cannot include invalid characters. YouTube's technical documentation for developers specifies that the title can contain all valid UTF-8 characters except < and >.

YouTube's tips for the title and the thumbnail point in the same direction:

  • Write titles that grab users' attention and correspond to the content of the video.
  • Do not use misleading, confusing or sensationalist titles, or clickbait that does not accurately represent the content of the video.
  • Avoid shrill titles, written in all caps or with lots of exclamation marks.

To choose the words, YouTube's own help page proposes an exercise: imagine you are searching for your own video, what would you type into the search bar? Those words should be in the title, and the video has to deliver what the title promises.

And what if you change the title of a video that is already published? YouTube explains that it may be re-ranked, but because its systems react to different user engagement with the video, not because of the mere change of title or thumbnail. Its final advice is clear: if something works for you, do not change it.

The description: the first lines rule

Descriptions tell YouTube's algorithm and users what the video is about. YouTube's help page divides them into two parts: what is seen before clicking “Show more” (or “more” on mobile) and what is seen after. Its recommendations:

  • Give priority to the first lines when describing the video, because they are the ones users will see first.
  • Each video should have a unique description, which makes it easier to find and sets it apart from similar videos.
  • Identify one or two main words that describe the video and make them prominent in both the description and the title.
  • To find them, YouTube suggests the Research tab in YouTube Analytics and Google Ads Keyword Planner.
  • Use chapters so users can jump to the important parts of longer videos, and include links to playlists of related videos.

The description allows a maximum of 5000 characters. The API's technical reference, intended for people who manage videos programmatically, gives another measure: the description has a maximum length of 5000 bytes, not characters, and it does not allow < or > either. When in doubt, it is better not to push up to the limit.

Tags: what they are for and what they are not

Tags are descriptive keywords you can add to a video so that users find your content more easily. But to the question of how important they are, YouTube's help page answers “Not important” and explains that they are mainly used to help correct common misspellings. On the video settings page it qualifies this: they can be useful if users often make typos when searching for your video's content; otherwise they have very little influence on the chances of it being discovered.

  • Use them for variants and typos: the name of your channel, of a brand or of a term that is written in several ways.
  • Do not pile them into the description: YouTube warns that adding too many tags in video descriptions breaches its policies on spam, deceptive practices and scams.
  • Respect the limit: according to the technical reference, 500 characters in total, and the commas between the items in the list count; if a tag contains a space, it is counted as if it were in quotation marks, and the quotation marks add up too.

Chapters: they organise the video for the viewer

Chapters divide videos into sections, each with its own preview; they also add information and context to each part and make it easy to rewatch each section. You can write them yourself in the description or allow automatic chapters, whose box is ticked by default on new videos. Mind you: not all videos meet the requirements for automatic chapters, and if you add your own in the description, the automatic ones are overridden.

The rules for your own are few: the first timestamp at 00:00, at least three timestamps in ascending order and no chapter shorter than 10 seconds (you will find them in the checklist for publishing a video on YouTube). Write chapter titles that say what is in each part: if the script is well divided, they come almost on their own, as we explain in how to write a script for YouTube.

What YouTube does not allow: misleading metadata and spam

YouTube's spam policy does not allow content, metadata or behaviour designed to take advantage of its community, and it also applies to links and thumbnails. One of its examples bears directly on SEO: malicious clickbait, that is, using misleading titles, thumbnails, descriptions or images with malicious intent to get someone to click on a video that does not deliver what is promised. YouTube's example is a video whose title promises a full match and which shows only a clip.

If content breaches this policy, YouTube may suspend monetisation or terminate the channel or account, and in some cases remove the content. And outside that policy, the performance help page warns that misleading, sensationalist or shrill titles and thumbnails can make new users lose interest in your content and, in some cases, lead to its removal for breaching the Community Guidelines. If you produce with AI, you will find the other policies that affect you in how to monetise a YouTube channel made with AI.

How to tell whether it works

The result is checked in YouTube Studio Analytics. In each video's Reach tab, the key metrics card shows impressions, impressions click-through rate, views and unique viewers. The help page on descriptions also points to the report on how users find your content, which shows the search terms most used to find it: if any of those words is missing from your description, including it makes you easier to find. We go into it in detail in YouTube metrics: what to look at after publishing.

How the Estudio de Canales prepares the metadata

The Estudio de Canales does not write your SEO or promise rankings: it prepares the title, the description, the tags and the chapters with YouTube's limits already checked, for you to upload in YouTube Studio.

  • Title. It starts from the video's working title and you edit it. It is not saved if it exceeds 100 characters or contains < or >, and without a valid title the video is not considered ready to publish.
  • Description. The studio proposes a template, without AI, with the chapters, the notice of AI-made content when there is any and the attributions of third-party assets. It is edited by hand, and is not saved if it exceeds 5000 bytes or contains < or >.
  • Tags. You write them, and they are not saved if they exceed 500 characters in total, counting the separators. The studio does not count the quotation marks around tags with spaces, so, if you use them, leave some margin.
  • Chapters. They come from the script sections. A chapter shorter than 10 seconds is merged into the next one (or the previous one, if it is the last) and you are warned; YouTube's rules are then validated and, if they are not met, it says why and they are not included.
  • Metadata. The package carries a metadata.json with the title, the description, the tags, the privacy setting, whether it is made for kids, the synthetic content notice, the chapters and the channel's language.

You choose the keywords: the studio checks the limits and the format, it does not decide what your audience is searching for. When you upload the video, you paste the link into the studio and, with your Google account connected, it tracks its figures.

Sources consulted

Checked on 9 October 2026. We link to the original source so that you can consult the current text.

Frequently asked questions

Do tags help rank a video on YouTube?

Very little. YouTube's help page explains that they are mainly used to correct common misspellings and that, unless people tend to misspell what they search for, they have very little influence on whether the video is discovered.

How many characters can the title and the description have?

The title, 100 characters; the description, 5000. The technical reference of the developers' API gives a maximum of 5000 bytes for the description and allows neither the less-than nor the greater-than sign in either of the two.

Does changing the title of an already published video improve its ranking?

Not by itself. According to YouTube, a video may be re-ranked because its systems react to different user engagement, not because of the mere change of title or thumbnail. And it advises not changing what already works.

What tools does YouTube suggest for choosing keywords?

The Research tab in YouTube Analytics and Google Ads Keyword Planner, as well as the Analytics report that shows the search terms people use to find you.

What happens if the title promises something the video does not have?

Using misleading titles, thumbnails or descriptions with malicious intent is malicious clickbait under YouTube's spam policy, which can lead to monetisation being suspended or the channel or account being terminated.

Related articles