- TikTok lookalikes come in three sizes: Narrow (highest similarity), Balanced (middle ground), and Broad (maximum reach).
- Audience size is chosen at creation and cannot be changed afterward.
- Your source audience must have at least 1,000 users or TikTok won't build the lookalike.
- TikTok builds a new lookalike within 24-48 hours and auto-refreshes it twice a week.
- Use Broad when scaling reach. Use Narrow when conversions and quality matter more than volume.
- Brand Profile keeps your messaging consistent when a Broad audience brings in more diverse users.
What Are TikTok Lookalike Audiences?
TikTok lookalike audiences help you find new users who share traits with your best existing customers. Feed TikTok a source audience. TikTok finds more people like them.
Definition and purpose
A lookalike starts with a custom audience you already have. That source can be website visitors, a customer list, or app users. TikTok analyzes the shared signals and builds a new audience from similar profiles across its platform.
Why lookalike audiences matter for scaling
Interest targeting gets you started. Lookalike targeting gets you scale. When your core customer base is small, a lookalike unlocks a much larger pool of qualified prospects, without you having to manually define every targeting parameter.
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The Three Lookalike Audience Sizes
Per TikTok's Business Help Center, lookalike audiences come in three size options. Each one trades similarity for reach differently.
Narrow: Maximum similarity, smaller reach
Narrow finds users closest to your source audience. You get high relevance. You get a smaller pool. Use this when precision matters more than volume, like when targeting high-value product buyers.
Balanced: Middle ground approach
Balanced sits between Narrow and Broad. You get reasonable similarity and reasonable scale. It is a solid starting point for most campaigns, especially when you are still learning what your audience responds to.
Broad: Maximum reach, moderate similarity
Broad increases potential reach with moderate similarity between the lookalike audience and your source. Per TikTok's documentation, Broad is the best option when scaling reach is the priority and you have creative that works across a wider audience.
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How to Expand Lookalike Audience Size When Creating
Audience size is set at creation. You cannot change the scale after the audience is saved. Follow these steps in TikTok Ads Manager.
Step 1: Prepare your custom source audience
Your source audience must have at least 1,000 users. This is a hard requirement from TikTok. A larger, higher-quality source typically produces a stronger lookalike.
Step 2: Go to Audience Manager and select Create Lookalike
In TikTok Ads Manager, click Tools. Select Audience Manager. Click Create Audience and choose Lookalike Audience.
Step 3: Choose your audience size scale
This is where you expand. Select Broad to maximize reach. Select Balanced for a moderate pool. Select Narrow for tight similarity. You cannot edit this setting after saving.
Step 4: Configure source, location, and placement
Choose your source custom audience. Select the target location. The actual audience size depends on TikTok's user base in that market and the scale you pick. A Broad audience in a small market may still be smaller than a Narrow audience in a large one.
Step 5: Name and confirm
Give your audience a descriptive name. Include the scale in the name, for example "Customer List Lookalike Broad US." Confirm creation. TikTok builds the audience within 24 to 48 hours.
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When to Expand vs. Keep Narrow
Expand when you need more reach and conversions
Move to Broad when your Narrow or Balanced audiences hit frequency caps. Broad also works well when entering a new market or testing a new product with a cold audience. More reach means more data, faster.
Keep narrow for high-quality, similar users
Stick with Narrow when your source audience is highly curated. Think top purchasers or high-lifetime-value subscribers. Narrow finds the closest matches. It often converts better, even if the pool is smaller.
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Key Constraints and Requirements
Minimum source audience size (1,000 users)
TikTok requires at least 1,000 users in your source audience. Smaller sources do not qualify. A bigger, more defined source gives TikTok more signal to work with.
Size depends on target market and location
Your chosen scale interacts with the local TikTok user base. Broad in a small country may still be a modest audience. Check Audience Manager after creation for the estimated size.
Creation time (24-48 hours)
TikTok takes up to 48 hours to build a new lookalike. Plan around this before your campaign launch date.
Auto-refresh schedule
Lookalike audiences auto-refresh twice a week when connected to an active ad group. If you delete the source audience, the lookalike loses auto-refresh capability. You will need to recreate it from a new source.
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How Coinis Campaign Launcher Streamlines Lookalike Audience Setup
Coinis Campaign Launcher publishes directly to Meta today. TikTok is on the roadmap. Even so, Coinis makes your TikTok work better right now.
Build and test audiences faster
Campaign Launcher's audience step helps you define and test targeting structures on Meta. The Narrow vs. Broad logic is the same across platforms. Test both approaches on Meta first. Find what works. Replicate that structure on TikTok with confidence.
Apply Brand Profile for consistent messaging at scale
A Broad lookalike audience is diverse. Your message needs to land across all of them. Brand Profile analyzes your brand voice and product positioning. It powers AI-generated copy and creatives that stay on-brand at any audience size, whether you are reaching 50,000 users or 5 million.
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Frequently Asked Questions
Can I change my TikTok lookalike audience size after it's created?
No. The size scale (Narrow, Balanced, or Broad) is locked at the time of creation. To change it, you need to create a new lookalike audience and select a different scale.
What is the minimum source audience size for TikTok lookalikes?
TikTok requires at least 1,000 users in your source custom audience before it will build a lookalike. Smaller sources do not qualify.
How long does TikTok take to build a lookalike audience?
TikTok typically builds a new lookalike audience within 24 to 48 hours. Plan ahead before any scheduled campaign launch.
What happens to a lookalike audience if I delete the source audience?
If you delete the source audience, the lookalike audience loses its auto-refresh capability. It will not update. You will need to create a new lookalike from a different source audience.