Do TikTok hashtags affect reach, and what to use instead
TikTok names hashtags as a ranking input but a weak one, and capped them at five in August 2025. Metricool's study of 2.3 million posts found hashtagged videos got about 5% more views. Real, and small.
7 minute read
The short answer
TikTok hashtags have a real effect on reach and it is small. They are one of several things the recommendation system reads to work out what your video is about, sitting alongside your caption and your sound, and they are outweighed by what viewers do once the video starts. You get five slots, which TikTok began enforcing in August 2025. Use three to five that describe the video accurately, skip the generic ones entirely, and spend the time you save on the first two seconds. The interesting part of this topic is not the number. It is that TikTok and Instagram genuinely differ here, and most advice flattens them into one rule.
What TikTok itself says
TikTok's newsroom explanation of the For You feed is unusually specific and worth reading directly. It lists the inputs as user interactions such as likes, shares, comments, accounts followed and content created; video information including captions, sounds and hashtags; and device and account settings. Two details do the heavy lifting. First, those inputs are weighted by how much they reveal about interest, and TikTok gives finishing a longer video far more weight than a weak signal like the viewer and creator being in the same country. Second, TikTok states plainly that neither follower count nor a history of high-performing videos is a direct ranking factor. Hashtags are on the list. They are near the bottom of it.
The data, and where it splits from Instagram
Metricool ran the same style of analysis on both platforms this year, which makes the comparison unusually clean. On TikTok it looked at 2,314,756 posts from more than 92,000 accounts and found that videos carrying at least one hashtag drew nearly 5% more views and over 9% more interactions than the average. On Instagram, across 24,364,803 posts from 375,118 accounts, posts with at least one hashtag drew 31.70% fewer views and 33.89% fewer interactions. Same research house, same window, opposite signs. If you have been applying one hashtag rule across both platforms, that gap is the reason to stop. TikTok still reads tags as a topic label with some value; on Instagram the correlation has gone negative.
Read that 5% carefully
It is a correlation across accounts, not a controlled test, so it does not prove that adding a tag lifts a specific video by 5%. It is also the difference between one hashtag and none, not between three and thirty. What it does tell you is that on TikTok the population of hashtag users is not systematically weaker than the population that skips them, which is the most likely explanation for Instagram's negative figure. Take it as permission to keep tagging without ceremony, not as a lever. A 5% shift in views is invisible next to the swing between a video that holds people for three seconds and one that does not.
Search is what actually replaced them
TikTok has spent two years building itself into a search product, and that is where the discovery effort now belongs. Creator Search Insights, launched in 2024, shows you what people are actually typing into the app and where the unanswered queries are. In April 2026, as Social Media Today reported, TikTok began showing creators the search keywords it has automatically attached to their videos, and letting them block irrelevant terms or suggest ones they want to rank for. That is a far more direct handle on discovery than any tag. Say your keywords out loud in the first line, put them in the caption, and burn them into your on-screen text so the system and the viewer both catch them.
How to spend the five slots, and what to do with the time saved
One or two tags for the niche community the video belongs to, one or two for the specific topic, and one for your own series or brand so your back catalogue holds together. Check the tag page first and make sure the videos there look like yours. Then stop. Metricool's data also found TikTok views down 31.30% year on year while creators posted 72% more videos, which tells you the baseline is falling and volume plus retention is what holds a channel up. That is a batching problem, not a tagging one, and it is the part FrameOS was built for: turn one long recording into a week of captioned vertical clips, then post them.
FAQ
Do hashtags actually help on TikTok?
A little. TikTok lists hashtags as part of the video information its recommendation system reads, alongside captions and sounds, but weights viewer behaviour such as finishing a video far more heavily. Metricool's analysis of 2.3 million posts found videos with at least one hashtag drew nearly 5% more views and over 9% more interactions than average. Real, measurable, and small compared with retention.
How many hashtags should you use on TikTok?
Three to five, and five is the maximum TikTok allows since August 2025. Spend them on tags that narrow down who the video is for: one or two for your niche community, one or two for the specific topic, and optionally one for your own series. Broad, catch-all tags describe nothing and use up slots you cannot get back.
Why does hashtag advice differ between TikTok and Instagram?
Because the platforms measure differently. Metricool ran the same analysis on both this year and found opposite results: TikTok posts with at least one hashtag drew nearly 5% more views, while Instagram posts with at least one hashtag drew 31.70% fewer. Instagram also removed hashtag following in December 2024 and its head has said tags do not drive distribution. One rule for both platforms will be wrong somewhere.
What matters more than hashtags on TikTok?
Retention and search. TikTok says strong interest signals like finishing a longer video count for far more than weak ones, and that follower count is not a direct ranking factor. On the discovery side, TikTok now shows creators the search keywords attached to their videos and lets them block or suggest terms. Keyword-led captions and on-screen text beat tag lists.
Sources
- How TikTok recommends videos #ForYou · TikTok Newsroom
- TikTok Implements Five Hashtag Limit Per Post · Social Media Today
- Metricool's 2026 TikTok Study · Metricool
- Metricool's 2026 Instagram Study · Metricool
- TikTok lets users add relevant keywords to metadata · Social Media Today
Related pages
Keep reading
More TikTok →The best time to post on Instagram, according to four studies
Buffer says Thursday 9am. Later says 5am. Sprout says early afternoon. They analysed billions of posts and still disagree — here is why, and what to do about it.
8 minute readThe best time to post on TikTok, according to five studies
Buffer analysed 7.1 million posts and rates Saturday the best day. Sprout Social analysed 2 billion engagements and says avoid the weekend entirely. Both are right, for different accounts.
8 minute readThe best time to post on LinkedIn, according to five studies
Buffer's 4.8 million posts point to Wednesday at 4pm and rank Tuesday among the worst days. Sprout Social's 2 billion engagements call Tuesday the best day of the week. Here is why.
8 minute readTurn one long video into a week of posts
300 credits for 3 days · no card.
Start free