FLUX 3 Upscaler Guide

Black Forest Labs’ upscaler is officially called FLUX Video Upscale. It launched on August 20, 2026, and is powered by FLUX 3 super-resolution. Instead of stretching pixels, it regenerates your video at a higher resolution, up to 4K.

• Sharper faces and textures
• Finer background detail
• Keeps the original audio track
• Works on AI-generated and real footage

Upscale last, after your edit is final.

Length

Up to 20 seconds

File size

Up to 50MB

Resolution

Up to 2560 × 1440. It does not accept 4K input

Format

MP4, as a file or a public link

Clips over the limits are rejected before processing, and you are not charged for them.

Choose an upscale factor from 1.5× to 3×. The default is 2×. Output keeps the source aspect ratio and is capped at about 14.4 megapixels per frame, roughly 4K, so large sources get less than the requested factor.

720p source at 2×

About 1440p

1080p source at 2×

About 4K

2K source at 1.5×

4K

Precise

Preserves the source and sharpens it. Use it for faces, real people, products, and brand assets

Creative

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

In creative mode, faces and products can drift. Switch to precise mode if anything changes that should not.

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

A misty pine forest at dawn, fine needles and bark texture, soft natural light.

You pay only for delivered output, per megapixel-second: the output megapixels per frame multiplied by the seconds of video. At launch, Black Forest Labs listed $0.07 per megapixel-second in precise mode and $0.10 in creative mode. A 10-second 1080p clip is about 20 megapixel-seconds. Check the current pricing page before you budget.

BFL API

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

ComfyUI

As a Black Forest Labs partner node

Other platforms

Some creative platforms offer it inside their own apps

API results come as a signed MP4 link that expires about an hour after it is ready, so download it promptly.

If you generate video with FLUX 3 Video, you can choose 2K or 4K output directly, added on September 10, 2026. Use the upscaler for clips made elsewhere, or for real footage.

• Start from the least compressed source you have
• Trim and edit first, then upscale
• Use precise mode for anything with a recognizable face or product
• Test a short clip before upscaling a batch
• Compare before and after at full size

Clip rejected

Too long, too large, or above 2560 × 1440

Output smaller than expected

The 14.4-megapixel cap limited the factor

Faces changed

Switch to precise mode

Payment errors

Add credits or turn on auto top-up

• Only upscale footage you own or have permission to use
• Do not present AI-enhanced footage as untouched evidence or news footage
• Keep the original file