FLUX 3 Upscaler Guide

Black Forest Labs’ upscaler goes by the official name FLUX Video Upscale. It launched on August 20, 2026, and runs on FLUX 3 super-resolution. Rather than stretching pixels, it regenerates your video at a higher resolution, up to 4K.

• Sharper faces and textures
• Finer detail in backgrounds
• The original audio track, kept intact
• Support for both AI-generated and real footage

Upscale last, once your edit is locked.

Length

Up to 20 seconds

File size

Up to 50MB

Resolution

Up to 2560 × 1440. 4K input is not accepted

Format

MP4, uploaded as a file or shared as a public link

Clips that exceed the limits get rejected before processing, and you pay nothing for them.

Pick a factor between 1.5× and 3×; 2× is the default. The output keeps the source aspect ratio and tops out at about 14.4 megapixels per frame, roughly 4K, so larger sources get less than the factor you request.

720p source at 2×

Roughly 1440p

1080p source at 2×

Roughly 4K

2K source at 1.5×

4K

Precise

Keeps the source faithful and sharpens it. Pick it for faces, real people, products, and brand assets

Creative

The default. Adds and restores fine detail. Suited to AI-generated footage, scenery, textures, and crowds

Creative mode can make faces and products drift. If anything shifts that should stay put, switch to precise mode.

In creative mode, a short prompt can steer the detail it adds. Leave the prompt blank for a neutral upscale.

Misty pine forest at dawn, with fine needle and bark texture and soft natural light.

You pay only for output you receive, billed per megapixel-second: output megapixels per frame times seconds of video. At launch, Black Forest Labs listed $0.07 per megapixel-second for precise mode and $0.10 for creative mode. A 10-second 1080p clip comes to about 20 megapixel-seconds. Check the current pricing page before you set a budget.

BFL API

The video-upscale-v1 endpoint, with polling or webhooks

ComfyUI

Available as a Black Forest Labs partner node

Other platforms

Some creative platforms build it into their own apps

The API returns a signed MP4 link that expires roughly an hour after it is ready, so download the file right away.

If you create video in FLUX 3 Video, you can select 2K or 4K output directly, an option added on September 10, 2026. Save the upscaler for clips made elsewhere and for real footage.

• Start from the least compressed source available
• Trim and edit before you upscale
• Use precise mode for any recognizable face or product
• Test one short clip before running a batch
• Compare before and after at full size

Clip rejected

It is too long, too large, or above 2560 × 1440

Output smaller than expected

The 14.4-megapixel cap reduced the factor

Faces changed

Switch to precise mode

Payment errors

Add credits or enable auto top-up

• Upscale only footage you own or have permission to use
• Never pass off AI-enhanced footage as untouched evidence or news footage
• Keep the original file safe