The essentials
- Where things stand in 2026: hashtags serve to classify content, no longer to push it. Instagram has capped posts at 5 hashtags since late 2024; LinkedIn has scaled back their use; TikTok and YouTube favour keywords from the text and the audio.
- Recommended number: 3 to 5 on Instagram, 3 to 5 on TikTok, 1 to 3 on LinkedIn, 1 to 2 on X, 0 on Facebook; always at the end of the text or in a comment.
- What has taken over: keyword search in descriptions, subtitles and voice, automatically detected topics and the behaviour of the first viewers.
- The method: one precise topic hashtag, one sector hashtag, one location hashtag if the business is local, one brand hashtag; no generic hashtags with several million posts.
For ten years hashtags were the main discovery lever on Instagram and a reflex on every network. In 2026 their role has changed: platforms work out the topic of a post from the text, the image, the subtitles and the audio, and distribute first according to the behaviour of the first viewers. The hashtag has become a classification label, useful but secondary. This page takes stock network by network and gives a ten-minute method for choosing them. How distribution works in general is described in the social media algorithm.
What hashtags still do, and what they no longer do
Three functions remain: helping the platform classify content within a topic (especially when the text is short), allowing a user searching for that topic to come across the post, and grouping content around an event or a brand. What they no longer do: trigger mass distribution by their mere presence. The head of Instagram has repeated it several times since 2023: hashtags have a marginal effect on reach. Data from tool publishers confirms that the difference in reach between posts with and without hashtags has become small on Instagram, nil on Facebook, and that on LinkedIn an excess of hashtags is associated with lower engagement.
Network by network in 2026
| Network | Recommended number | Current role | What matters more |
|---|---|---|---|
| 3 to 5 (technical limit of 5 since December 2024) | Topic classification, search | Keywords in the caption and the on-screen text, Reels retention, sends and saves | |
| TikTok | 3 to 5 | Classification, internal search, taking part in a trend | Keywords spoken aloud and in the description, retention, rewatches |
| 1 to 3, at the end of the text | Low; hashtag pages have lost their importance | Comments in the first hour, structured text, sector keywords | |
| YouTube | 2 to 3 in the description | Displayed above the title, search | Title, description, chapters, thumbnail, retention |
| X | 1 to 2 | Events, live topics | Fast replies and reposts, Premium accounts |
| 0 to 1 | Close to zero | Shares, comments, groups | |
| 0 to 2 | Marginal | Title and description rich in keywords, well-named board |
Put hashtags at the end of the caption, separated from the text, or in the first comment on Instagram and LinkedIn; do not insert them inside sentences, where they harm readability and the read rate.
What has replaced hashtags: social search
TikTok, YouTube and Instagram have become search engines for part of their users, in particular the under-35s who use them to look for restaurants, tutorials or reviews. The practical consequence: what makes content findable is the presence of the words people type, in the title, the description, the subtitles, the on-screen text and, on TikTok and YouTube, in what is said out loud. A plumber's video that starts with “how to bleed a radiator that no longer heats” will be found on that search; the hashtag #plumbing changes nothing. This logic converges with SEO; the connections are described in SMO and SEO: how to combine them.
Choosing your hashtags in ten minutes
- One precise topic hashtag linked to the content of the post (#bleedradiator rather than #heating), between 10,000 and 500,000 posts: used enough to be searched for, not so much that the post disappears within a minute.
- One sector hashtag (#plumber, #accountant) that situates the business.
- One location hashtag if the business is local (#plumberrennes, #rennes); local searches on Instagram and TikTok are growing.
- One brand hashtag or content series hashtag (#tuesdaytip) to group your posts together and let customers mention you.
- Possibly one trend hashtag if the post genuinely takes part in it; otherwise it attracts an off-target audience.
| Type | Example for an accountancy firm in Nantes | Indicative volume | To avoid |
|---|---|---|---|
| Precise topic | #vatsoletrader | 10,000 to 100,000 | #business (tens of millions, no chance of being seen) |
| Sector | #accountant | 100,000 to 500,000 | #accounting on its own, too broad |
| Location | #nantes #nantesbusiness | Variable | Hashtags for places where you do not operate |
| Brand or series | #thetaxcolumn | Your own | A new hashtag with every post |
| Trend | Only if the content takes part in it | High and short-lived | Unrelated trend hashtags, banned or restricted hashtags |
Before using a hashtag, check that it is not restricted (Instagram hides content from certain hijacked hashtags) by searching for it in the app. Build four or five hashtag sets per content pillar, stored in the editorial calendar, and do not copy the same set of 30 hashtags under every post: it is both pointless and, on Instagram, impossible since the limit of five.
Measuring what hashtags bring
On Instagram, a post's statistics used to show the reach coming from hashtags; that line has disappeared in favour of the “followers”, “non-followers”, “explore” and “search” sources. On TikTok, the “search” source is visible in TikTok Studio. The useful measurement therefore consists in tracking the share of reach coming from non-followers and from search, post by post, and in comparing two hashtag sets over five posts each, with equivalent content. If the gap is under 20%, the choice of hashtags is not an issue; spend the time on the hook and on retention, levers described in increasing engagement on your posts.
How GreenRed helps
Rather than juggling several tools, the GreenRed AI Writer module brings these metrics together in a single dashboard, compares them over time and tells you which actions come first. You can try it free, with no card, from the Pricing.
Frequently asked questions
How many hashtags should you use on Instagram in 2026?
Three to five, which matches the technical limit imposed by Instagram since late 2024. One precise topic hashtag, one sector hashtag, one location hashtag if the business is local and one brand hashtag are enough. Lists of 30 generic hashtags no longer have any effect and are no longer accepted.
Do hashtags still increase reach?
Marginally. They help the platform classify content and make it possible to be found through a search, but distribution depends first on retention, on the interactions of the first viewers and on keywords in the text and the audio. On Facebook the effect is nil; on LinkedIn, an excess is associated with less engagement.
Should hashtags go in the text or in a comment?
At the end of the text, separated by a line break, or in the first comment on Instagram and LinkedIn: reach is equivalent and readability is better. Do not insert hashtags in the middle of sentences, they break the reading flow and add nothing to classification.
How do you know whether a hashtag is useful?
Search for it in the app: if it shows content close to yours and a volume of between 10,000 and 500,000 posts, it is usable. Check that it is not restricted. Then compare two hashtag sets over five posts each, tracking the reach coming from non-followers and from search.