YouTube SEO is the set of choices that make a video findable inside YouTube, on Google and in the answers of AI engines: the query you decide to cover before filming, then title, thumbnail, description, chapters and what is said on camera. YouTube says it ranks search results on relevance, engagement and quality, and on the 13 UK search results pages we checked on 13 October 2026, 58.6% of the sources cited by Google's AI Overviews were YouTube videos.
The trouble is that most YouTube SEO guides repeat the same checklist.
And some items on it are out of date.
- Thumbnails at "1280x720, under 2 MB": that is still what Google's AI Overview for "youtube seo" in the US recommends. YouTube's own thumbnail guide now says 3840x2160 pixels and 50 MB from a computer.
- Shorts "up to 60 seconds": it still appears in guides ranking on page one in Italy. Since 15 October 2024 the limit has been three minutes.
- Putting the keyword in the file name: it is everywhere, AI Overviews included, yet no official YouTube page lists it as a signal.
Among the US results I read, Search Engine Journal and Semrush link YouTube's help pages and its Creator Insider channel. In Italy, where we also publish, only one guide in eight links YouTube's help at all.
Why listen to an SEO agency about YouTube?
Because we work for businesses that sell, not channels that need subscribers. Sunscape, an Italian solar developer, went from 329 to 5,809 organic impressions a month in six months: the detail is in our piece on how long SEO takes. Macropix, which builds custom LED screens, has received around 7,000 enquiries in seven years.
So where does YouTube come in?
In both cases the website moved the numbers. Video comes after, as proof and as a source Google and AI engines can cite.
In this guide:
- the signals YouTube actually states, with the source next to each;
- a check of 26 results pages, 13 in the UK and 13 in Italy: AI Overviews, video carousels, Shorts;
- twelve short sections, each with its own in-depth guide.
Let's get into it.
What YouTube says about search signals (three, and rankings can't be bought)
YouTube's help page on how YouTube search works lists three groups of signals, weighted differently depending on the type of search.
- Relevance: how well title, tags, description and video content match the query.
- Engagement: YouTube uses it as a relevance signal, meaning how much people watch the video for that query.
- Quality: which channels show expertise, authoritativeness and trustworthiness on the topic.
The same page contains two sentences that rarely make it into guides.
First: with history turned on, your results can differ from someone else's for the same search.
Second: YouTube does not accept payment for better placement in organic search results.
The first matters more than it seems: anyone showing a client a screenshot of their video "ranking first on YouTube" is often looking at their own watch history, not the market. On Google, ranking factors are documented far more extensively.
What counts and what doesn't, with the source alongside (the table nobody on page one has)
Each element with what the most authoritative available source says about it. Where the source is a 2017 US correlation study I have said so: correlation is not causation.
| Element | What the source says | Source | Weight |
|---|---|---|---|
| Title | One of the "most important parts of the metadata"; 100 characters maximum | YouTube tags and upload guides | High |
| Thumbnail | One of the most important parts of the metadata; 3840x2160 pixels recommended | YouTube tags and thumbnail guides | High |
| Description | One of the most important parts; but "zero correlation" between keyword-optimised descriptions and rankings | YouTube guide / Backlinko 2017, 1.3 million videos, US | High as context, none as keyword padding |
| Watch time for the query | Stated engagement signal | YouTube search guide | High |
| Chapters and timestamps | Official technical requirements; 31% of videos cited by AI engines carry timestamp signals | YouTube chapters guide / Otterly.ai 2026 | Medium on YouTube, high in AI answers |
| Tags | "Play a minimal role in your video's discovery" | YouTube tags guide | Low |
| Comments and shares | Strong correlation with top positions | Backlinko 2017, US | Correlation, not a direct lever |
| Uploaded file name | No official page lists it as a signal | None | None documented |
The last row is the divisive one. Renaming your file youtube-seo-guide.mp4 appears in no YouTube help page and not in Backlinko's YouTube ranking factors study either. It takes ten seconds, so do it if you like: just know you are following a habit, not a source.
Search and suggested are two different systems (and the second watches what viewers do)
Search ranks results for an explicit query and responds to metadata. Home, suggested videos and the Shorts feed are recommendations: there is no query there.
YouTube's page on recommendation systems lists the signals for that second system: viewing behaviour, likes, dislikes, subscriptions and feedback, including satisfaction surveys, plus the reputation and quality of the channel.
So title and description move search, not suggested.
And who explains the algorithm to UK searchers?
Mostly creators: on the UK results page for "youtube algorithm", 6 of the 8 sources in the AI Overview are YouTube videos. The signals one by one are in our guide to the YouTube algorithm.
Before you film: query, channel, metadata, thumbnail, upload (five decisions to make at a desk)
Whether a video ranks or not is decided before the camera comes out.
Finding the right queries
In the UK, "youtube seo" averages 480 searches a month in Keyword Planner (12-month average, checked with DataForSEO on 13 October 2026), ranging from 210 to 880. "How to rank youtube videos" gets 20.
Small numbers: the demand for these topics sits inside YouTube, not on Google.
That is why the first source is the Trends tab in YouTube Studio, which according to YouTube's guide shows what your audience searched for in the last 28 days and the content gaps, meaning searches where viewers can't find good results. Then autocomplete, then Keyword Planner. The method is the same as keyword research for text: start from search intent, not volume.
The business channel
A detail most guides skip: without a verified account you can't upload videos longer than 15 minutes (YouTube guide to longer videos) or custom thumbnails. Two limits that usually surface on launch day.
On the UK results page for "how to create a youtube channel", 5 of the 6 AI Overview sources are YouTube videos, and there is a Shorts block: for this topic Google prefers a tutorial to text. Name, handle, description, banner and playlists are in our guide to a YouTube channel for business.
Title, description and tags
Title, thumbnail and description are, in YouTube's words, "the most important parts of the metadata" in its guide to tags. The page that explains tags spends a paragraph saying tags matter little.
The limits: 100 characters for the title, 5,000 for the description (upload guide). The title leads with the phrasing people actually use; the description speaks to the person first, then the system.
Tags, according to YouTube, help mostly when your topic is commonly misspelled. Yet on the UK results page for "youtube tags", 4 of the organic results are themselves YouTube pages. How to write all three fields, with examples, is in our guide to YouTube titles, descriptions and tags.
The thumbnail
The thumbnail drives click-through rate, which YouTube Studio reports as impressions click-through rate.
It is also the clearest case of stale advice. On 13 October 2026 Google's AI Overview for "youtube seo" in the US recommends 1280x720 pixels. The official page, checked the same day, says 3840x2160 pixels, minimum width 640, 16:9, JPG or PNG, and 50 MB from a computer. 2 MB remains the mobile limit.
A 1280x720 thumbnail is accepted, to be clear. It just has one ninth of the pixels YouTube now suggests.
Sizes, channel banners and testing different covers are in our guide to YouTube thumbnails.
The upload
- 15 minutes: the limit for unverified accounts.
- 256 GB or 12 hours: the largest file accepted, whichever comes first.
- Three minutes, vertical or square: a video like that automatically becomes a Short. A vertical cut of 2 minutes 50 meant as a "normal" video ends up in the Shorts feed.
The UK results page for "how to upload a video on youtube" has a Shorts block and 6 YouTube sources out of 11 in the AI Overview. Steps, visibility settings and scheduling are in our guide on how to upload a YouTube video.
Chapters and transcripts (the two fixes AI engines read too)
Chapters have precise requirements, published in YouTube's video chapters guide: at least three timestamps in ascending order, the first at 00:00, each chapter at least ten seconds long. Miss one and the chapters don't appear.
Outside YouTube the same timestamps feed key moments in Google results. Google Search Central describes Clip and SeekToAction markup for videos hosted on your own site: it is the work covered in our video SEO guide and in our analysis of whether video helps a page rank.
The transcript is the other half. Automatic captions tend to get product names wrong. A hand-corrected subtitle file turns speech into machine-readable text, which is exactly what the next section needs.
Videos cited by AI: what we measured on 26 results pages (58.6% in the UK)
The third place a video earns visibility, after YouTube and Google, is inside AI answers. Few people measure it, so we did: on 13 October 2026 we queried Google on mobile for the 13 keywords in our YouTube content plan, in the UK in English and in Italy in Italian (DataForSEO, first page, unique source URLs).
| Query (Google UK, mobile) | AI Overview sources | Of which YouTube videos | Video carousel | Shorts block |
|---|---|---|---|---|
| youtube seo | 11 | 7 | Yes | No |
| youtube ads | 8 | 5 | Yes | No |
| how to create a youtube channel | 6 | 5 | Yes | Yes |
| youtube algorithm | 8 | 6 | Yes | No |
| youtube tags | 7 | 2 | Yes | No |
| youtube description | 7 | 3 | Yes | No |
| youtube thumbnail size | 7 | 2 | Yes | No |
| youtube analytics | 8 | 6 | Yes | No |
| how to get more views on youtube | 10 | 8 | Yes | No |
| vidiq | no AI Overview | 0 | Yes | No |
| youtube shorts | 4 | 1 | Yes | Yes |
| how to upload a video on youtube | 11 | 6 | Yes | Yes |
| how much does youtube pay | overview returned empty | 0 | Yes | No |
| Total UK | 87 | 51 (58.6%) | 13 of 13 | 3 of 13 |
| Total Italy (same 13 topics in Italian) | 93 | 42 (45.2%) | 13 of 13 | 4 of 13 |
Three things stand out.
- The video carousel appeared on all 26 pages, and every one of the 93 videos shown (46 in the UK, 47 in Italy) was hosted on YouTube.
- An AI Overview appeared on 12 of 13 pages in both countries: the only exception was "vidiq", a brand search.
- For "how to get more views on youtube", 8 of 10 UK sources were videos: for some topics Google cites the tutorial before the article.
The global picture points the same way. Otterly.ai analysed over 100 million citations across six engines over thirty days in 2026: YouTube citations go 38.7% to Perplexity and 36.6% to AI Overviews, 19.6% to AI Mode and 4.4% to ChatGPT. 94% go to long-form videos, 5.7% to Shorts. The study does not state a market or language.
So is there a way to "optimise for AI"?
Not with dedicated tricks. Google's page on AI features in Search says there are no special optimisations needed to appear in AI Overviews and AI Mode: the page must be indexed and eligible for a snippet. For ChatGPT, OpenAI states that sites opted out of the OAI-SearchBot crawler are not shown in ChatGPT search answers.
For a video, that translates into clean transcripts and chapters that split the content into citable answers, and, if the video also lives on your site, a page both crawlers can reach. Nobody can promise a citation.
The topic has its own guide: videos cited by AI Overviews and ChatGPT. For the text side, see our guides to generative engine optimisation and AI Overviews.
Your videos are there, but no AI cites them?
You have just seen that on 13 UK searches more than half of the AI sources were YouTube videos. We check which queries in your sector show videos and AI Overviews, and where your channel and your site are missing.
Book a strategy callAfter publishing: measuring, promoting, choosing tools (where most hours get lost)
YouTube Analytics: the four numbers to read first
Views tell you almost nothing. I look at these first, in this order.
- Impressions and impressions click-through rate: they separate a distribution problem from an appeal problem.
- Average view duration, not completion percentage.
- Traffic source "YouTube search": the queries people arrived with.
- Sessions from youtube.com in Google Analytics, matched with conversions: this is where video becomes a business number.
On the UK results page for "youtube analytics" there is no "People also ask" box, and 6 of 8 AI Overview sources are videos. Our guide to YouTube Analytics covers the reports one by one. If videos also sit on your own pages, the video report in Google Search Console tells you which ones Google indexed and which it dropped.
Getting more views without buying them
You can pay for views in two ways. With advertising, legitimately. Or with services that sell them in bundles, which YouTube's fake engagement policy treats as metric manipulation.
One detail few people know: watch hours from ad campaigns don't count towards the YouTube Partner Programme thresholds.
On the UK results page for "how to get more views on youtube", 8 of the 10 AI Overview sources are YouTube videos. The levers that remain are the ones on this page, ranked by impact in our guide on how to increase YouTube views.
vidIQ and TubeBuddy
They are the two browser extensions named in almost every guide. vidIQ even appears in Google's AI Overviews for "youtube seo" in the US and the UK.
They do two jobs: estimating demand for a query inside YouTube, where Keyword Planner can't see, and comparing titles and thumbnails.
For "vidiq" Google UK shows no AI Overview but a knowledge panel and an app listing: it is a brand search. Features and differences are in our vidIQ vs TubeBuddy comparison.
Shorts, ads and earnings (where a business thinks the opposite of a creator)
Shorts
Shorts are vertical or square videos up to three minutes long, a limit in force since 15 October 2024, with their own feed and recommendation system.
In our 13 UK results pages the Shorts block appeared on 3. In AI answers Shorts carry little weight: 5.7% of YouTube citations in the Otterly.ai study, against 94% for long-form.
For a business the takeaway is practical: a Short gets you discovered, a long video gets you cited. The most efficient approach is cutting Shorts from the long video, not producing them separately. The business angle, without creator advice, is in our guide to YouTube Shorts for business.
YouTube ads
YouTube advertising is bought through Google Ads, and each format has precise rules. According to the Google Ads guide to video ad formats:
- skippable in-stream: skippable after 5 seconds; with CPV bidding you pay when the viewer watches 30 seconds or interacts;
- non-skippable in-stream: 15 to 60 seconds, charged per impression;
- bumper: 6 seconds, non-skippable, charged per impression;
- in-feed: you pay only when someone clicks to watch.
For a client in the energy sector we are planning production this way: one main video and, from the same shoot, 15-second and 6-second cuts for Shorts and bumper ads. One shoot, three formats.
On the UK results page for "youtube ads", 5 of the 8 AI Overview sources are videos. Costs, targeting and when it pays off are in our guide to YouTube ads; we run campaigns as part of our Google Ads service.
How much YouTube pays
Earning from ads requires the YouTube Partner Programme: 1,000 subscribers plus 4,000 public watch hours in the last 12 months, or 1,000 subscribers and 10 million Shorts views in the last 90 days. Hitting the thresholds doesn't guarantee entry: a review follows, usually taking about a month.
The earnings metric is RPM, revenue per thousand views. According to YouTube's guide it is generally lower than CPM, which measures what advertisers pay before revenue sharing.
And how much should a business care?
Very little. A manufacturer selling installations worth tens of thousands of pounds doesn't live on RPM: one quote request that came from a video is worth more than any AdSense payment. On the UK results page for "how much does youtube pay" the AI Overview came back empty in our check, and our guide on how much YouTube pays explains the numbers for people who don't want to become creators.
Why video is rarely a traffic channel for a B2B business (and what job it does instead)
According to DataReportal, at the end of 2025 YouTube ads reached 55.5 million people in the UK, 79.7% of the population and 81.5% of internet users, up 700,000 (1.3%) in a year. In Italy, by comparison, reach fell by a million (2.4%) to 41.2 million.
Even so, for most industrial SMEs YouTube does not bring traffic in meaningful quantities.
At Macropix the work that moved revenue was on the website: in July 2026 the domain holds 25.55% share of voice on the ledwall cluster, ahead of Amazon at 18.08% (source: Semrush), with over a hundred keywords in the top three on Google Italy. The YouTube channel had nothing to do with it. The full story is in our case study on SEO for manufacturing.
For these businesses video has a different job: it is proof. An installation filmed on site answers "what does it really look like" better than any paragraph. It is the same principle behind B2B SEO: content isn't there to be found by everyone, it is there to help a few people decide.
If you want to know where you stand before filming anything, this is the analysis we do within our SEO services and, for generative engines, in SEO for AI. More measured results are in our projects.
In short (and the number that will matter over the next two years)
Three stated signals: relevance, engagement, quality.
Title, thumbnail and description matter; tags and file names barely.
Thumbnails at 3840x2160, Shorts up to three minutes: always check the official page.
On 13 UK results pages, 51 of 87 AI sources were YouTube videos.
For a business, video is proof and a citable source before it is traffic.
In the reports I send clients I have stopped putting views at the top. In their place is a less comfortable question: can a machine read this video? Clean transcript, compliant chapters, speech that names products in full.
A video with 400 views cited by an AI Overview on a commercial query can be worth more than one with 40,000 views that nobody was searching for, and its return arrives without the counter moving. Nobody has measured that gap yet in most sectors: whoever does it first, in their own market, gets an advantage budget can't buy.
YouTube SEO FAQs
No. Title and description work on relevance, one of the three groups of signals YouTube lists in its search guide. The other two are engagement for the specific query and the channel's quality on the topic. In suggested videos, viewing behaviour, likes, subscriptions and viewer feedback count too.
No, or barely. YouTube's own guide says tags help if your topic is commonly misspelled and otherwise play a minimal role in discovery. Backlinko's 2017 study of 1.3 million videos, a US sample, had already found only a weak correlation between tags and rankings.
No. YouTube does not state one. In Backlinko's 2017 US study, first-page videos averaged 14 minutes 50 seconds: long-form is not penalised when it is justified. The signal that matters is average view duration, not file length.
It depends where you want to be found. Shorts, up to three minutes, have their own feed and help discovery. In AI answers the picture flips: in Otterly.ai's 2026 study of over 100 million citations, 94% of YouTube citations went to long-form videos and 5.7% to Shorts.
Yes. In our check of 13 October 2026, the video carousel appeared on all 13 UK results pages for YouTube-related searches, and all 46 videos shown were hosted on YouTube. Google can also show key moments, meaning a video's chapters as separate entry points.
Yes. On the same 13 UK results pages, 51 of the 87 sources cited by AI Overviews were YouTube videos, or 58.6%. Google says no special optimisation is needed: indexing and snippet eligibility are what count. Accurate transcripts and chapters make content easier to read and cite, with no guarantees.
No. The Partner Programme is about monetisation: it requires 1,000 subscribers and 4,000 public watch hours in 12 months, or 10 million Shorts views in 90 days. YouTube search does not depend on it, and for a business the value of video lies in enquiries, not RPM.
