Short answer: three to five, and make most of them about the place and the niche, not about AI. Instagram's Help Center now says you can use up to 5 hashtags on a post. YouTube's help page says that if a video has more than 60 hashtags, it ignores every one of them. TikTok's help pages name no number, and say hashtags are one signal among several, weighted below how people actually react to the video. So the old habit of thirty tags in the first comment is over on Instagram and useless elsewhere.
This guide is first-hand where it can be. Influgen runs AI influencers whose captions and hashtags are written by an agent team, and the owner approves or rejects each post. We read 82 of those posts from our database on 13 November 2026 (eight influencers, 27 August to 12 November). The 29 posts that were approved or published used , and : a city, a neighbourhood, a street. Only one post in all 82 carried an AI hashtag. The platform rules below were read on each platform's own help page the same day. There are no pictures of our influencers here, only the numbers.
2.6 hashtags on average, never more than 5
40 of their 75 tags (53%) named a place
Five is now the ceiling on Instagram. It was a sensible number before that, too.
The hashtag limits, platform by platform (checked 13 November 2026)
Platform
What its own help page says
What that means for an AI influencer
Instagram
"You can use up to 5 tags on a post." More than 5 on one photo or video, and the comment won't post.
Pick 3 to 5. The 30-tags-in-a-comment trick no longer works.
YouTube (incl. Shorts)
More than 60 hashtags and YouTube ignores each one. Up to 3 appear by the title; over-tagging or unrelated tags can get a video removed from search.
2 to 5 relevant tags in the description. Never a wall of them.
TikTok
No number stated. Hashtags count as "content information" next to sounds and views; user interactions "are generally weighted more heavily".
3 to 5 that describe the video. The hook does more than the tags.
Sources: Instagram Help Center, "Use hashtags on Instagram"; YouTube Help, "Find playlists & videos using hashtags"; TikTok Support, "How TikTok recommends content" and "Making a post". Platforms change these pages without notice, so check them before you build a posting routine on a number.
Two details people miss. Instagram's page counts tags per post, so don't plan on a second batch of tags in a comment. On YouTube, only three tags show above the title and YouTube picks which; the rest still work as links in the description.
What 29 kept posts from our AI influencers used
Our influencers post as fashion, city and lifestyle characters in Berlin, Lyon, Paris, Milan, Lisbon and New York. Their agent team writes the caption and tags; the owner keeps or rejects the whole post. Here is what the tags looked like, split by that decision:
Posts (27 Aug to 12 Nov 2026)
Posts
No tags
1 to 3 tags
4 to 5 tags
More than 5
Average
Median caption
Kept (approved or published)
29
4
19
6
0
2.6
179 characters
Rejected by the owner
20
7
6
5
2
2.3
211 characters
Not decided yet or failed
33
4
16
11
2
2.8
190 characters
Read it honestly: the owner rejects posts for the pictures, not the tags, so this table does not prove that fewer tags make a better post. What it does show is the habit that survived: short captions, a handful of tags, none over the limit. Four posts had six or seven tags; none of them was kept, and on Instagram today they would hit the limit.
What the kept tags were about:
Places, 53%. Neighbourhoods and streets beat whole cities: Mitte, Kreuzberg, Torstraße and Vieux Lyon rather than just Berlin or Lyon. A place tag tells the platform who nearby might care.
The niche, most of the rest. Style words like vintage leather, tailored style, street style, second hand, all black.
The moment, a few. Sunday reset, opening night, rainy day fit, get ready with me.
AI tags, almost none. One post out of 82 had an AI tag. That is on purpose, and the next section is why.
Half the tags our kept posts used named a place, usually a neighbourhood or a street.
#AI is not an AI label
A hashtag such as #ai or #aiinfluencer is not the label the platforms ask for, and it is not a substitute for one.
TikTok requires a label on AI-generated content that shows realistic images, audio or video. Its own page says creators can disclose "by adding text, a hashtag sticker, or context in the post's description", and also offers a "Creator labeled as AI-generated" label you switch on when posting. Turn the label on; a tag in the description is an extra, not the main thing.
Ads are a separate rule. If the post is paid, gifted or has an affiliate link, the US FTC's guide for influencers says not to mix the disclosure "into a group of hashtags or links". Put "Ad" or "Sponsored" where people see it first, then your tags. Terms like "sp", "spon" or "collab" don't count. The free AI disclosure checker writes the line for your platform.
Spending one of your five Instagram tags on #ai also buys you little: it describes how the picture was made, not what it shows. Your audience is looking for Berlin street style, not for a rendering method. Be open about AI in the label and the bio, and use the tags to say what the post is about.
How to pick 3 to 5 tags for each post
One place tag, as small as is still searched. The neighbourhood or street if people use it, otherwise the city. It must match the picture: a Lisbon tag on a scene with Parisian roofs is the kind of slip that makes an AI account look fake.
One or two niche tags. The style, the topic, the thing in the picture (vintage leather, flea market finds, skincare routine).
One moment or format tag, only if true. Sunday reset, get ready with me, opening night.
One series tag of your own, if you run a series. It lets people find the rest. One of our characters used one for a lake series.
Stop at five. Check the count before you post; on Instagram a sixth tag in a comment makes the comment fail.
What to skip: tags copied from someone else's post, generic giant tags (#love, #instagood, #fyp) that say nothing about the post, tags that don't describe the picture (YouTube can remove the video from search for those), and anything that implies the character is a real person you are not.
Thirty tags in a comment was the old habit. Instagram now stops at five.
Where hashtags go and how the caption helps
Instagram: in the caption. People search by keywords too, so the first line of the caption should say plainly what the post is (a place, an item, a moment). Our kept captions had a median of 179 characters: two or three short sentences in the character's voice, then the tags.
TikTok: in the description, after a first line that says what happens. TikTok's own page says search ranks by how well the content matches the search, as well as by hashtags.
YouTube Shorts: in the title or description. Up to three show by the title; YouTube chooses them.
Hashtags get a post in front of the right first viewers. After that, what people do with the video decides how far it goes. Spend your time on the first second of the post; the AI influencer content ideas and the AI influencer mistakes guides have our own numbers on what holds attention.
Quick answers
How many hashtags should an AI influencer use on Instagram? Up to 5, which is the limit in Instagram's own Help Center. Three to five that name the place, the niche and the moment work better than five generic ones.
Do hashtags still work on TikTok? They help TikTok understand the video, but its own page says user interactions such as watch time are generally weighted more heavily. Use 3 to 5 that describe the video, then put the effort into the hook.
What is the YouTube hashtag limit? More than 60 hashtags on a video and YouTube ignores all of them. Only up to three show above the title.
Should an AI influencer use #ai or #aiinfluencer? Not instead of the label. Turn on the platform's AI label, say it in the bio, and use your tags for the subject of the post. A tag can be an extra disclosure, never the only one.
Does #ad count as an ad disclosure? The FTC says #ad or #sponsored are fine, but the disclosure must be easy to see and not mixed into a group of hashtags. Put it first. This is not legal advice.
Make yours
Influgen writes each post's caption and tags for you: the writer agent picks the idea, the tags name the real place and niche in the picture, the AI label is set, and a critic checks every frame before you see it. Create your own influencerfree here: 7-day trial with 50 credits, no card needed. Need a name or a bio first? Try the free AI influencer name generator and bio generator, or see Influgen in numbers.
Method
Platform rules: read on 13 November 2026 on help.instagram.com ("Use hashtags on Instagram"), support.google.com/youtube ("Find playlists & videos using hashtags"), TikTok Support ("How TikTok recommends content", "Making a post", "About AI-generated content") and ftc.gov ("Disclosures 101 for Social Media Influencers"). Our numbers: 82 posts with a caption in Influgen's database (8 influencers, 27 August to 12 November 2026), grouped by the owner's decision; "place" counts tags naming a city, district, street or venue (40 of 75 kept tags). Small sample, one account's style; it describes our habit, it does not test which tag count gets more reach. Not legal advice.
Influgen gives your influencer a team that plans, creates and posts on its own. Create your own influencer free. The first 1,000 accounts get 100 extra credits.
The 2026 holiday dates from Thanksgiving to New Year's Eve, a post idea for each one, and the five mistakes that give AI holiday pictures away: wrong season, wrong light, garbled gift tags, a sweater that comes and goes, and undisclosed gift-guide links.
Neither bans AI characters outright, but both are built for real people's real recommendations. LTK's Community Guidelines ban AI-generated content that misrepresents identity or experience; ShopMy's terms say your statements must reflect your honest views and personal experiences, and it can ask for a government ID. A labelled character can apply; a fake 'I wear this every day' can't.
Amazon's Associates and Influencer Program pages have no rule against AI characters. The program wants a YouTube, Instagram, Facebook or TikTok account (business account on Instagram and Facebook) and judges followers and engagement. The hard line comes from the FTC: a character can show a product, but it can't say it used it.
