> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# FreeU_V2 - ComfyUI Built-in Node Documentation

> Complete documentation for the FreeU_V2 node in ComfyUI. Learn its inputs, outputs, parameters and usage.

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/FreeU_V2/en.md)

The FreeU\_V2 node enhances image generation quality by applying frequency-based modifications to a diffusion model's U-Net architecture. It uses configurable scaling factors to adjust feature channels in different blocks, improving output without requiring additional training.

## Inputs

| Parameter | Data Type | Required | Range      | Description                                                         |
| --------- | --------- | -------- | ---------- | ------------------------------------------------------------------- |
| `model`   | MODEL     | Yes      | -          | The diffusion model to apply FreeU enhancement to                   |
| `b1`      | FLOAT     | Yes      | 0.0 - 10.0 | Backbone feature scaling factor for the first block (default: 1.3)  |
| `b2`      | FLOAT     | Yes      | 0.0 - 10.0 | Backbone feature scaling factor for the second block (default: 1.4) |
| `s1`      | FLOAT     | Yes      | 0.0 - 10.0 | Skip feature scaling factor for the first block (default: 0.9)      |
| `s2`      | FLOAT     | Yes      | 0.0 - 10.0 | Skip feature scaling factor for the second block (default: 0.2)     |

## Outputs

| Output Name | Data Type | Description                                                   |
| ----------- | --------- | ------------------------------------------------------------- |
| `model`     | MODEL     | The enhanced diffusion model with FreeU modifications applied |

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