Using hashtags effectively in TikTok ads is not the same as on Instagram or Twitter. On TikTok, hashtags serve a more functional role-they help the algorithm categorize your content and place it in front of the right audience. Done poorly, they clutter your caption. Done right, they amplify your reach and make your ad spend work harder.
Understand TikTok’s Algorithm and Hashtag Role
TikTok’s For You Page is driven by user behavior signals, not just hashtag search. Hashtags act as signals to the algorithm about who should see your video. They don’t drive discoverability the way they do on Instagram. Instead, they group your content into topics. When you use the wrong or overly broad hashtags, you waste your ad’s potential by showing it to uninterested users.
Best Practices for TikTok Ad Hashtags
Based on years of managing over $2 million in TikTok ad spend, here are the most effective strategies:
1. Prioritize 3-5 Highly Relevant Hashtags
On TikTok, less is more. You rarely need more than five hashtags. Overloading your caption with a dozen tags looks spammy and dilutes the signal. Stick to a small set that directly describe your ad’s content, your niche, and your target audience.
- Niche-specific tags: For example, if you run ads for a B2B SaaS product, use tags like #B2Bmarketing or #SaaSgrowth instead of generic #marketing.
- Branded hashtags: Create a unique tag for your campaign. This builds community and makes it easy to track user-generated content.
- Trending but relevant: Only use trending hashtags if they genuinely connect to your ad’s message. Forced trends hurt performance.
2. Use a Mix of Broad and Narrow Tags
A balanced hashtag set includes one broad, high-volume tag and three to four more specific, lower-competition tags. Broad tags like #fyp or #viral are rarely useful-they are too saturated and attract the wrong audience. Instead, choose a broad tag that still fits your industry, like #ecommerce or #healthtips, and combine it with narrower tags like #sustainablefashion or #mealprepideas.
3. Place Hashtags in the Caption, Not the Comments
Some creators put hashtags in the first comment to keep the caption clean. This is a mistake for ads. The TikTok algorithm reads the caption metadata. Hashtags in the comments are not indexed the same way. Always include your primary hashtags in the caption itself.
4. Research Competitor and Audience Tags
Don’t guess. Open TikTok’s search bar and type in keywords related to your product. Note the auto-suggested hashtags and how many views they have. Look at what tags your top competitors use in their organic content. Replicate the ones that show high engagement and alignment with your product. Avoid tags with over 100 million views-they are too broad for precise targeting.
Mistakes to Avoid
- Using irrelevant trending tags: The algorithm will misclassify your ad, leading to poor CTR and wasted spend.
- Copying Instagram hashtag strategies: TikTok is not a discovery platform through hashtags. Focus on relevance over volume.
- Ignoring caption length: Long hashtag strings make your caption look cluttered. Keep it clean and readable.
- Using hashtags that are too generic: #love, #fun, or #trending add zero value and attract bots, not buyers.
Testing and Optimization
Treat your hashtag set as a variable to test. Run two ad sets with the same creative but different hashtag combinations. Monitor the cost per result and click-through rate after 48 hours. The winning combination will show lower CPAs and higher engagement rates. This lean testing method aligns with the efficient, data-first approach we use at Sagum for all TikTok campaigns.
Ultimately, hashtags on TikTok are a small but important piece of a larger puzzle. When used correctly, they help the algorithm serve your ad to the right people-without adding cost or complexity. Focus on relevance, keep it tight, and always test.
