ComfyUI Extension: ComfyUI-SmartSize

Authored by Jnocode

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Run ComfyUI workflows without the setup

No installs, no CUDA version roulette, no GPU sitting idle on your bill. Bring a workflow and run it in the browser.

A simple but essential custom node for ComfyUI that automatically detects image dimensions and snaps them to the nearest multiple of 16.

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README

ComfyUI-SmartSize

A simple but essential custom node for ComfyUI that automatically detects image dimensions and snaps them to the nearest multiple of 16. This is critical for Flux and SDXL workflows to prevent EinopsError (shape mismatch) and ensure high-quality generation.

Features

  • Auto-Detection: Reads the width and height of any input image.
  • Safe Snapping: Automatically adjusts dimensions to be multiples of 16 (e.g., 1000 -> 992).
  • Workflow Simplification: No more manual width/height entry in KSampler or EmptyLatent nodes.

Installation

Method 1: Manual

  1. Clone this repository into your ComfyUI/custom_nodes/ folder: 
    git clone https://github.com/xiujiang1987/ComfyUI-SmartSize.git
  2. Restart ComfyUI.

Method 2: ComfyUI Manager

(Coming soon)

Usage

  1. Add the node "Smart Image Size (Flux/SDXL)".
  2. Connect your Load Image node to the input.
  3. Connect the width and height outputs to your Empty Latent, ModelSamplingFlux, or ImageScale nodes.
    • Note: You may need to convert the target node's widgets to inputs first (Right-click node -> Convert Widget to Input).

License

MIT

Run ComfyUI workflows without the setup

No installs, no CUDA version roulette, no GPU sitting idle on your bill. Bring a workflow and run it in the browser.

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