LatentConcat - ComfyUI Built-in Node Documentation

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

The LatentConcat node combines two latent samples by joining them together along a chosen dimension. It takes two latent inputs and concatenates them along the x, y, or t axis, with the option to control which sample comes first. The node automatically adjusts the batch size of the second input to match the first before performing the concatenation.

Inputs

Parameter	Description	Data Type	Required	Range
samples1	The first latent sample to concatenate	LATENT	Yes	-
samples2	The second latent sample to concatenate	LATENT	Yes	-
dim	The dimension along which to concatenate the latent samples. Positive values (x, y, t) place samples1 before samples2 in the result. Negative values (-x, -y, -t) place samples2 before samples1. The dimension mapping is: x = width, y = height, t = time/frames	COMBO	Yes	"x" "-x" "y" "-y" "t" "-t"

Note: The second latent sample (samples2) is automatically adjusted to match the batch size of the first latent sample (samples1) before concatenation.

Outputs

Output Name	Description	Data Type
output	The concatenated latent samples resulting from combining the two input samples along the specified dimension	LATENT

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