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Batch Images node with one image connected and one free input below it Some nodes in ComfyUI have autogrow inputs, also called dynamic inputs. These nodes do not show a fixed list of slots. They add another input as soon as you connect the last free one, so a single node can batch two images or twenty without any extra setup.

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How autogrow inputs work

  1. Connect the last free input. In the example on this page, an image source is linked to image0 on the Batch Images node, while image1 is still free.
  2. Watch the node grow. As soon as you fill the last free input, the node appends a new empty input below it. In the picture below, the new image2 input appears after image1 is connected.
  3. Repeat as needed. Every time you fill the last input, the node grows again, until it reaches the maximum number of inputs that node allows.
Batch Images node with two connected inputs and a newly added free input highlighted Two more details worth knowing:
  • Order matters. The inputs are passed to the node in the order they appear, so image0 comes before image1 and so on. Keep that in mind when the result depends on the sequence, for example when you batch images that run through a video model.
  • The free input is a placeholder. It is only part of the node’s data once you connect something to it. A node that allows zero inputs still runs when every slot is empty.

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Nodes that use autogrow inputs

Each node decides its own limits. Hover the input in ComfyUI to read its tooltip when you are not sure how many values it accepts.
Autogrow is part of the ComfyUI V3 node schema. If you write custom nodes, see Dynamic Inputs for the Autogrow template API.

Batch Images node

Combine several images into one batch, with as many inputs as you need.