SwarmUI Image Drop Resolution

A SwarmUI extension that automatically sets the generation resolution (width/height) to match the dimensions of an image dropped or pasted onto the image prompt area, and optionally resizes the image itself to a configurable target size.

Screenshot

Features

• Auto-resolution from image prompt: When you drop or paste an image onto the image prompt area, the output Width and Height inputs are updated to match the image dimensions, and Aspect Ratio is set to Custom.
• Auto-resolution from init image: When an image is set as the Init Image, the same resolution-update logic applies automatically.
• Image prompt resizing: Dropped/pasted image prompt images are automatically scaled to a configurable target area while preserving the original aspect ratio. Dimensions are rounded to the nearest multiple of 16, as required by most AI image models.
• Init image resizing: The same scaling logic can be applied independently to the Init Image.
• Side Length slider: Controls the target side length for both resize features (64–4096, default 1024). Images are scaled so their total pixel area approximates side length × side length.
• Global enable/disable toggle: The Image Drop Resolution group header has a master on/off toggle that disables the entire extension without changing any individual settings.
• Per-feature toggles: Each of the four behaviours (update resolution for image prompt, update resolution for init image, resize image prompt, resize init image) has its own independent toggle — any combination can be enabled at once.

Installation

1. Navigate to your SwarmUI Extensions folder.
2. Clone this repository:

   git clone https://github.com/GlenCarpenter/SwarmUIImageDropResolution.git
   

3. Restart SwarmUI.

Usage

1. Open the Generate tab in SwarmUI.
2. Drop or paste an image onto the image prompt area, or set an Init Image.
3. Find the Image Drop Resolution parameter group in the inputs sidebar. All five controls are on by default:

Control	Default	Description
Group toggle (header)	On	Master switch — disables the entire extension when off. Individual settings are preserved.
[IDR] Update Resolution To Image Prompt	On	Updates Width/Height to match the dropped/pasted image prompt image.
[IDR] Update Resolution To Init Image	On	Updates Width/Height to match the Init Image.
[IDR] Resize Image Prompt to Side Length	On	Resamples the image prompt image to the calculated target dimensions before use.
[IDR] Resize Init Image to Side Length	On	Resamples the Init Image to the calculated target dimensions before use.
[IDR] Side Length	1024	Target side length used by both resize features. The image area approximates side length² pixels.

The resize and resolution-update features are fully independent — you can resize an image without updating the resolution inputs, or update the resolution inputs to match the original dimensions without resampling the image.