A ComfyUI custom node that randomly selects a height and width pair from a list in a config file. The core use is to provide variety in generations of large numbers of images at once.

Presets included:

9 SD 1.5-friendly resolutions.
9 SDXL-friendly resulotions
9 Resolutions centered around 512x512
9 around 640x640
13 around 768x768
15 around 896x896
17 around 1024x1024

Install

cd [path to ComfyUI]/custom_nodes
git clone https://github.com/JerryOrbachJr/ComfyUI-RandomSize.git

Usage

Select a seed. The same seed should produce the same size every time
Control After(/Before) Generate: set to increment, decrement, or random to get a random size from the preset each generation.
Select a preset. The default preset is SD 1.5 if none is chosen.
Run your queue.

Adding Presets

Add a text file with name of your choosing and extension ".yaml" in [path to ComfyUI]/custom_nodes/ComfyUI-RandomSize/sizes/custom
The first line of your file needs to be sizes:
Every successive line should be a size in the format - WIDTHxHEIGHT replacing WIDTH and HEIGHT with pixel numbers e.g. - 768x512
Restart Comfy to see your Preset in the list