FreeU - ComfyUI Built-in Node Documentation

Complete documentation for the FreeU node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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The FreeU node applies frequency-domain modifications to a model’s output blocks to enhance image generation quality. It works by scaling different channel groups and applying Fourier filtering to specific feature maps, allowing for fine-tuned control over the model’s behavior during the generation process.

Inputs

Parameter	Data Type	Required	Range	Description
model	MODEL	Yes	-	The model to apply FreeU modifications to
b1	FLOAT	Yes	0.0 - 10.0	Backbone scaling factor for model_channels × 4 features (default: 1.1)
b2	FLOAT	Yes	0.0 - 10.0	Backbone scaling factor for model_channels × 2 features (default: 1.2)
s1	FLOAT	Yes	0.0 - 10.0	Skip connection scaling factor for model_channels × 4 features (default: 0.9)
s2	FLOAT	Yes	0.0 - 10.0	Skip connection scaling factor for model_channels × 2 features (default: 0.2)

Outputs

Output Name	Data Type	Description
model	MODEL	The modified model with FreeU patches applied