Generate B-roll with Flux 3 from Black Forest Labs

Create up to 20 seconds of B-roll with natively synced audio — and drop polished clips into your video in seconds.

See what Synthesia can do for you

If you’ve ever had the right script, but not the right supporting visuals, creating B-roll can slow everything down.

With Flux 3, you can now generate longer, more polished clips in one go:

Generate up to 20 seconds of B-roll in a single prompt
Get native audio (dialogue, sound effects, and ambient noise) generated alongside the video for better sync

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New Feature

Introducing Sessions: Interactive Avatars that coach, interview, and guide

Real conversations with a lifelike Avatar for practice and gathering insight, at a scale a person never could.

10/1/26

Improvement

Add burned-in captions to dubbed videos

Add burned-in captions to dubbed videos in one click, so your localized content stays accessible and easy to follow, even with sound off.

9/30/26

Improvement

Upload WebP images to your videos

Bring WebP files straight into the editor—use still or animated WebP on the canvas, keep transparency, and skip manual file conversions.

9/29/26

See what works, borrow what’s brilliant, and connect with professionals like you.

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Join 2M+ users today and start creating videos with AI avatars in 140+ languages.