# TikTok Custom Audiences

**Category:** platform  
**Short Description:** TikTok's audience targeting feature for retargeting and lookalike creation.  
**Last Updated:** 2026-05-30T00:00:00Z

## Definition

TikTok Custom Audiences allows advertisers to create targeted audiences based on existing customer data, website visitors, app activity, or engagement with TikTok content. These audiences can be used directly for targeting or to create lookalike audiences.

## Examples

- Creating retargeting lists from website visitors
- Building lookalike audiences from high-value customers
- Targeting users who engaged with previous TikTok content

## FAQs

### What are TikTok Custom Audiences?

TikTok Custom Audiences are targeting audiences built from your own data — customer lists, website visitors (via the TikTok Pixel), app activity, or engagement with your TikTok content/ads. They let advertisers reach people who already have a relationship with the brand on TikTok, powering retargeting and customer marketing, and serving as seeds for lookalike (similar) audiences.

### What sources can build a TikTok Custom Audience?

Common sources: customer file (uploaded emails/phone numbers/IDs), website traffic (via the TikTok Pixel, often segmented by action), app activity, lead-gen form submissions, and engagement audiences (people who viewed your videos, followed your account, or interacted with your ads). Each defines a group by its actual relationship to your brand, enabling tailored re-engagement.

### How are TikTok Custom Audiences used?

Primarily for retargeting (re-engaging site visitors, video viewers, or engagers), customer marketing (reaching existing customers), exclusions (suppressing converters from prospecting), and as seeds for lookalike audiences to find new similar users. As warm audiences, they're best served creative suited to people who already know you — reminders, offers, objection handling — rather than cold introductions.

### Can I build lookalike audiences from TikTok Custom Audiences?

Yes. TikTok Custom Audiences serve as the seed for Lookalike Audiences — TikTok analyzes the traits of your custom (source) audience and finds new users who resemble them, letting you prospect for people similar to your best customers or engagers. As always, a high-quality seed (e.g. purchasers rather than all visitors) produces a stronger lookalike. It's the same seed-and-expand pattern as other platforms.

### How does privacy affect TikTok Custom Audiences?

Like other platforms, pixel- and list-based audiences are affected by privacy controls and signal loss (tracking restrictions, consent requirements), which can reduce match rates and audience sizes. Best practices are using properly consented first-party data, server-side/API event sharing where available for more reliable signal, and engagement audiences (on-platform behavior). Custom audiences remain valuable but increasingly rely on durable first-party signals.

## Related Terms

### Component Terms

- **[Remarketing](/resources/glossary/general/remarketing)**: Core capability of Custom Audiences, enabling re-engagement with users who've shown interest
- **[Customer Journey](/resources/glossary/general/customer-journey)**: Framework that Custom Audiences supports by enabling targeted messaging at different stages
- **[TikTok Spark Ads](/resources/glossary/platform/tiktok-spark-ads)**: Ad format that leverages Custom Audiences for more effective organic content promotion
- **[Marketing Attribution](/resources/glossary/general/marketing-attribution)**: Critical for measuring Custom Audiences' impact on conversion paths and ROAS

### Child Terms

- **[Custom Audiences](/resources/glossary/general/custom-audiences)**: The broader category of audience targeting that Custom Audiences belongs to