If you have uploaded to YouTube with any regularity, you have probably stared at the tags field and wondered whether it does anything. Or dropped three hashtags into a description and expected them to drive views. Or spent 20 minutes tagging a video with highly specific keywords only to watch it sit at 87 views for three months.
YouTube's metadata system is genuinely confusing because it bundles three different things — hashtags, video tags, and description keywords — that function differently, surface on different parts of the platform, and carry different weight in the algorithm. Treating them as interchangeable is a common mistake that wastes effort and leaves real discoverability gains on the table.
This guide separates each element and explains what it actually does, so you can invest your optimisation time where it counts.
The Three Layers of YouTube Metadata
YouTube discovery relies on metadata the way search engines rely on on-page signals. But YouTube has three distinct metadata layers that most guides bundle into a single vague category called "tags":
- Video tags — the dedicated Tags field in YouTube Studio, invisible to viewers
- Hashtags — placed in the video description or title, visible to viewers and clickable
- Description keywords — the natural-language text of your description, parsed by YouTube's ranking system
Each plays a different role. Understanding that distinction is the starting point.
Video Tags: What They Still Do (and Don't Do)
Video tags are the metadata field that has been part of YouTube since its early days. You enter them in YouTube Studio when uploading or editing, and viewers never see them.
At the time of writing, the prevailing understanding among YouTube creators and SEO practitioners is that tags carry significantly less weight than they once did. YouTube's own statements have reinforced this — their documentation has noted that titles, thumbnails, and descriptions are more important for discovery. Tags are primarily used by the algorithm to help understand the context and category of a video, and to surface it in the "related videos" sidebar alongside similar content.
What to actually do with tags
- Include your primary keyword as the first tag
- Add 3–5 variants of how someone might search for the topic (different wordings, synonyms)
- Include your channel name or brand name as a tag (this helps related-video placement for your own content)
- Avoid keyword-stuffing with dozens of semi-relevant tags — this creates noise rather than clarity
The golden rule: tags should clarify what the video is about, not expand into everything you hope the algorithm might notice. A video about beginner sourdough bread should have tags like "sourdough bread," "sourdough for beginners," "how to make sourdough" — not "bread," "baking," "food," "cooking," "kitchen," "recipe," etc.
Check your YouTube character counter if you want to see how much space you have for tags and description text before you hit the limit.
Hashtags: Discoverability on the Surface
Hashtags on YouTube work differently from tags. They are visible to viewers and are clickable links — tapping a hashtag takes the user to a feed of all public videos that used the same hashtag. They are placed either in the video description or, in some cases, in the video title itself.
At the time of writing, YouTube displays up to three hashtags above the video title on the watch page. If you include more than three in your description, YouTube selects which three to show (the first three you list, in most cases). Including too many hashtags — YouTube has indicated a threshold around 15 at the time of writing — may result in YouTube ignoring hashtags on that video altogether.
Where hashtags help
| Surface | How hashtags help |
|---|---|
| Watch page | Displayed above title, help viewers explore the topic |
| Hashtag feed | Video appears when someone clicks the same hashtag |
| YouTube Search | Some users search hashtags directly, especially on mobile |
| Shorts | Hashtags carry more discovery weight for Shorts content |
Where hashtags don't help much
Hashtags do very little for main-feed recommendations or the home page algorithm. YouTube's home feed is driven by viewer history, personalisation signals, and how well a specific video has performed for similar viewers — hashtags are not a meaningful input there.
How many hashtags to use
Three to five well-chosen hashtags in the description is a reasonable approach for regular videos. For Shorts, where hashtag discovery has been more active, you can use slightly more — but the principle of relevance over volume still applies. See our YouTube Shorts hub for more on Shorts-specific discoverability.
Description Keywords: The Real SEO Lever
If you could only optimise one thing for YouTube search, the video description would be high on the list. YouTube's system processes the natural language in descriptions to understand what a video covers, and this directly influences which search queries a video is considered relevant for.
The description is not a place to list keywords robotically. YouTube's processing is sophisticated enough that it rewards a clearly written, relevant description over a keyword-stuffed paragraph that reads awkwardly. A well-written 150–250 word description that naturally includes:
- What the video covers (in plain language)
- The primary topic and related concepts
- A sentence or two about why this video is useful
...will perform better than a description that reads like a list of search terms with a few connective words sprinkled in.
First 100–150 characters matter most
YouTube truncates descriptions in search results. The first 100–150 characters (roughly the first sentence or two) are what a viewer sees before they need to click "Show more." Write your description opening as if it is your meta description — compelling, on-topic, and containing your primary keyword. This also influences how YouTube's system weights the description for search relevance.
Title Keywords: The Highest-Value Real Estate
If you are reading about tags and hashtags and wondering why your videos still aren't getting found, the most likely culprit is the title. The video title is the single highest-weight metadata field for YouTube search at the time of writing.
Your primary search term should appear in the title, ideally near the front. This is not about keyword cramming — it is about matching what people actually type. If someone searches "how to start a podcast" and your video is titled "My Podcasting Journey Begins," it will be at a structural disadvantage versus a video titled "How to Start a Podcast (Beginner Equipment Guide)."
Titles and descriptions work together. A title that matches a search query, backed by a description that confirms the video covers the topic in depth, is the foundation of YouTube SEO.
Hashtags in YouTube Shorts: Different Rules
Shorts behave somewhat differently from long-form videos, and hashtags play a slightly more prominent role in Shorts discovery at the time of writing. Many creators report that relevant, specific hashtags — particularly topic-category hashtags — have a measurable effect on Shorts distribution.
The mechanics are not fully documented publicly by YouTube, and they change as Shorts as a product evolves. A practical approach for Shorts: include two to three directly relevant hashtags, consider adding #Shorts as one of them (this has historically helped YouTube classify the content correctly), and keep your total well below ten.
For a deeper dive on Shorts-specific discoverability, see YouTube Shorts SEO and discovery.
What Actually Drives YouTube Discovery
It is worth zooming out, because the honest answer to "what makes YouTube show my videos to more people" is less about hashtags and tags than most guides imply.
At the time of writing, the factors with the greatest documented influence on YouTube distribution are:
- Click-through rate (CTR) — does your thumbnail and title make people click when it appears?
- Watch time / audience retention — once someone clicks, do they watch a meaningful portion of the video?
- Satisfaction signals — likes, comments, shares, saves, the "not interested" signal
- Relevance to the viewer — YouTube personalises recommendations heavily based on what that specific viewer has watched before
Tags and hashtags contribute to context and categorisation, but they are downstream of these core performance signals. A video with perfect tags and zero watch time will not rank. A video with mediocre tags but strong retention and a high click-through rate on a relevant thumbnail will rank.
See YouTube SEO guide for a fuller treatment of how these factors work together.
A Practical Optimisation Checklist
Pull up your next YouTube video and run through this before publishing:
Title:
- Contains the primary search term naturally
- Under 60 characters ideally (prevents truncation in most surfaces)
- Communicates the value or outcome clearly
Description:
- First sentence includes the primary keyword and summarises the video
- 150–250 words of genuinely useful context
- Includes 3–5 relevant hashtags at the end of the description or inline
- Contains a clear CTA (subscribe, link to related content, etc.)
Tags:
- Primary keyword as the first tag
- 3–5 variants or closely related terms
- Channel/brand name included
- No more than 10–12 total tags
Thumbnail:
- High contrast, readable text at small sizes
- Emotionally resonant or curiosity-triggering image
- Consistent with your channel's visual brand
For dimension specifications on YouTube thumbnails and other assets, see the YouTube thumbnail size and YouTube video size reference pages.
The Verdict on Each Element
To bring it together clearly:
| Element | Discovery impact | Viewer-facing? | Effort worth |
|---|---|---|---|
| Video title | High | Yes | Highest |
| Description text | High | Partially (truncated) | High |
| Video tags | Low-moderate | No | Low — keep it tidy |
| Hashtags | Low-moderate | Yes (3 shown) | Low — 3–5, relevant only |
This does not mean ignoring tags or hashtags. It means putting your 20 minutes of optimisation time into the title and description first, and treating tags and hashtags as a five-minute cleanup at the end rather than a major focus.
Conclusion
YouTube hashtags and video tags each serve a purpose, but neither is the engine of discovery. Tags help YouTube categorise your content and surface it in related videos — use them cleanly and specifically, not as a wall of keywords. Hashtags help viewers navigate a topic cluster and appear above your video title — use three to five relevant ones and no more.
The real discoverability work happens in your title, your description's first sentences, and in making videos that people actually watch to the end. Get those right, and the tags and hashtags are a supporting detail rather than a make-or-break factor.
For a broader view of how YouTube analytics can tell you which of your optimisation choices are actually working, that guide is a useful next read.