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Black Forest Labs · Video

Flux 3 Video

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Black Forest Labs' video model. Smooth motion with synchronized sound.

Turns a render into a clip with synchronized ambient sound, from a start frame or a start and end frame, 5 to 15 seconds at 720p or 1080p.

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  • Clips with synchronized sound
  • Start and end frames
  • 5, 10 or 15 seconds
Photoreal render of a riverside pavilion with teal shell roofs beside a large waterfall.

How it works

How to use it

Flux 3 Video is one choice in the model menu of every app that runs on it.

  1. 01

    Open Image to Video

    Add the render you want to animate as the start frame, and an end frame if you want to control where the shot finishes.

  2. 02

    Choose Flux 3 Video and describe the shot

    Pick 5, 10 or 15 seconds and 720p or 1080p, then describe the camera move and the sound, such as birds, traffic or a quiet interior.

  3. 03

    Compare takes and share

    Generate a take, compare it with Kling V3 on the same frame and keep the one that tells the story best.

Made with Flux 3 Video

Real results from the apps that run on it, as they came out.

  • Harbor terminal with peaked copper roofs and a passenger ferry passing in front.
  • Busy skylit food hall photoreal render with yellow vaulted ceiling and central island counters
  • Grand lobby photoreal render with a central circular bar and twin sweeping staircases

Ideas for your work

What people get out of Flux 3 Video, by the kind of work they do.

  • Rendair for Architects

    A presentation clip with atmosphere

    Turn the hero render into a short fly-in with ambient sound for the opening of a client or competition presentation.

  • Rendair for Interior Designers

    Hear the room

    Animate a styled interior with a slow camera move and soft ambient sound so clients feel the space.

  • Rendair for Builders

    Social clips that play with sound

    Make short clips of a development for social and ads, with sound already in place.

What it is good at

Flux 3 Video is Black Forest Labs' video model. It turns a render into a short clip with synchronized ambient sound, from a start frame or from a start and an end frame.

When to pick it

  • You want a clip that already has sound, for social posts, ads or a presentation opener.
  • You want to control both the first and the last frame of the shot.
  • You need a longer shot, up to 15 seconds.

What to watch for

  • Describe one clear camera move per clip; several moves in one prompt are harder to control.
  • Longer clips and 1080p cost more. Test the move at 5 seconds and 720p first.
  • Frames far from a standard video shape are cropped to fit, so frame your render close to the ratio you want.

About Flux 3 Video

Flux 3 Video is the video side of Black Forest Labs' FLUX 3 family, announced in July 2026 and opened to developers in August 2026. Black Forest Labs designed it to generate sound in the same pass as the picture, and to work from start and end frames.

Flux 3 Video at a glance

Spec

Details

Made by

Black Forest Labs

Output

Video with sound

Inputs

A start frame, an optional end frame and a text prompt

Output sizes

720p, 1080p

Clip length

5, 10 or 15 seconds

Typical time per result

About 3 minutes

Frequently asked questions

Does Flux 3 Video add sound?

Yes. It generates ambient sound together with the picture.

Flux 3 Video or Kling V3?

Flux 3 Video adds sound and goes up to 15 seconds. Kling V3 offers a 4K option. Try both on the same frame and compare.

How long can a clip be?

5, 10 or 15 seconds per clip.

Where it fits

The work this model is picked for, from concept to client meeting.

All Use Cases

Start with one of these apps

Pick Flux 3 Video from the model menu, or let the app choose.

All Apps

Other models

All Models

Try Flux 3 Video on your own project

Free to start. No card, no plugin, nothing to install.

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