title: Instagram vs TikTok Hashtags — What's Different in 2026 description: Instagram and TikTok treat hashtags completely differently in 2026. This guide covers number of tags, placement, strategy, and whether you should cross-post your hashtail set. slug: instagram-vs-tiktok-hashtags date: April 4, 2026 author: PostWave Team category: Platform Strategy
readTime: 8 min read
Instagram vs TikTok Hashtags — What's Different in 2026
Last updated: April 2026
Most creators cross-post the same content to Instagram and TikTok. Many cross-paste the same hashtags too. This is a mistake. The two platforms treat hashtags completely differently — in terms of how the algorithm uses them, how many you should use, where to put them, and which specific tags actually work.
This guide explains the key differences so you can stop treating your hashtag strategy as one-size-fits-all.
How Each Algorithm Treats Hashtags Differently
Instagram in 2026: Instagram's algorithm has moved away from hashtag-driven distribution. Adam Mosseri confirmed in 2024 that hashtags are less about pushing content to new people and more about content categorisation — telling Instagram what your content is about so it can find the right audience. The real driver of reach on Instagram is now AI-based content understanding: Instagram's algo reads your caption text, analyses your image or video content, and determines who to show it to.
Hashtags still matter, but as a secondary signal. They help Instagram confirm the content category — not override its AI assessment. A mismatch between your content and your hashtags (e.g., using #travel on a food post) is now actively penalised.
TikTok in 2026: TikTok also uses AI content understanding as its primary signal, but hashtags play a somewhat stronger role in initial content distribution. When you post to TikTok, the algorithm uses your hashtags (along with caption text and video content) to decide who sees it in the first distribution wave. If that initial audience responds well (watch time, shares, comments), the video gets pushed wider.
The practical difference: on TikTok, using the right hashtags on your first post to a new audience matters more than on Instagram. On Instagram, a great video with mediocre hashtags can still go viral if the content is strong. On TikTok, the initial categorisation step matters more.
Number of Hashtags — Instagram vs TikTok
| Platform | Recommended | Maximum | Notes |
|---|---|---|---|
| Instagram Reels | 5–7 | 30 | 30 works on some accounts, but 5–7 is the current sweet spot |
| Instagram Feed | 3–5 | 30 | Fewer, more specific tags outperform shotgun approach |
| Instagram Stories | 1–2 | 10 | Hashtag reach on Stories is minimal — skip if your account is small |
| TikTok | 4–6 | 100 | TikTok allows more but quality over quantity still applies |
The "30 hashtags" era on Instagram ended around 2022. Instagram's own creator education team now recommends 3–5 "targeted" tags. Research from multiple large accounts consistently shows that 5–7 highly relevant tags outperform 30 generic ones.
On TikTok, the same principle applies but with slightly more flexibility. TikTok's search functionality has improved significantly in 2025–2026, which means hashtags matter more for search discoverability than pure algorithmic reach.
Where to Put Hashtags — Platform by Platform
Instagram: Put hashtags in your caption, not the comments. Instagram confirmed in 2024 that caption hashtags are indexed more reliably than comment hashtags. You can put them at the end of your caption text, or add a few line breaks between your caption and your hashtag list — both approaches work. Dumping 30 tags in a block at the end of a caption doesn't look great visually, which is another reason 5–7 reads much cleaner.
TikTok: Put hashtags in your caption. TikTok doesn't have a comments-based hashtag culture like Instagram did. Keep your caption concise — TikTok captions are more often read than Instagram captions, and a caption crammed with hashtags looks messy to viewers. A clean caption with 4–6 relevant tags at the end is the right format.
Which Hashtags Work on Instagram But Not TikTok
Some hashtag strategies that work on Instagram are ineffective or actively counterproductive on TikTok:
#fyp and #foryou on TikTok: These are the most common TikTok hashtag mistakes. Both tags have billions of views — which means your content is competing against the entire platform. TikTok's own team has stated these tags don't actually boost FYP placement. They waste a hashtag slot that could be used for something specific to your niche.
Instagram niche tags on TikTok: Tags like #instafood, #instafitness, or #instatravel don't function the same way on TikTok. These are Instagram-specific conventions. On TikTok, platform-generic tags like #foodtok, #fitnesstok, or #traveltok are the equivalent — they signal that you're posting to TikTok's specific niche community.
Using popular but irrelevant hashtags: On Instagram, using a vaguely related popular hashtag (e.g., a fitness creator using #motivation) was tolerated by the old algorithm. On TikTok, content-hashtag mismatches are more aggressively filtered. An irrelevant hashtag on TikTok doesn't just fail to help — it can trigger the algorithm to show your content to the wrong audience, which tanking its distribution.
Cross-Posting — Should You Use the Same Hashtag Set?
The short answer: No.
If you're cross-posting the same video to both platforms (increasingly common with Reels + TikTok), use different hashtag sets. The reasons:
- Platform-specific tags differ (#instafood vs #foodtok)
- Optimal tag count differs (5–7 vs 4–6)
- Audience behaviour differs — the same tag means different things to different platform communities
- Instagram penalises TikTok watermarked videos — and similarly, a hashtag set clearly optimised for Instagram signals cross-post laziness to TikTok's algorithm
Build a core hashtag set for each platform and save them in your notes app or caption template. Spending 30 seconds to swap hashtags before posting to each platform meaningfully improves performance.
Which Platform Benefits More From Hashtags in 2026?
TikTok benefits more from hashtags in 2026, particularly for:
- Initial content categorisation
- Search discoverability (TikTok search is now a significant traffic source)
- Reaching new niche communities
Instagram hashtags still matter, but the primary driver of Instagram reach in 2026 is content quality and caption keyword relevance — not the hashtag list. If you have limited time to optimise, spend it on writing a clear, keyword-rich Instagram caption before worrying about the perfect hashtag set.
On TikTok, spending 2 minutes thinking carefully about which 4–6 hashtags genuinely match your content is worth more than spending 10 minutes assembling an Instagram hashtag list of 30.
Two-Minute Checklist Before Posting
Before posting to Instagram:
- Have you used 5–7 hashtags?
- Are all of them relevant to this specific post (not just your niche in general)?
- Are the hashtags in your caption (not comments)?
- Are you rotating from your last post's hashtags?
Before posting to TikTok:
- Have you used 4–6 relevant hashtags?
- Have you avoided #fyp and #foryou?
- Have you used TikTok-specific tags (#foodtok, #traveltok) instead of Instagram tags (#instafood)?
- Does every hashtag match exactly what this video is about?
Next Steps
For optimised Instagram hashtag sets by category, browse our Instagram hashtags page.
For TikTok-specific hashtag sets, see our TikTok hashtags page.
For a custom hashtag set for either platform, use our free Hashtag Generator — type your topic and get a ranked, platform-appropriate set in seconds.