NO8D-Empty latent

Every ComfyUI workflow starts the same way: you need an empty latent, and you have to type two numbers that multiply out to the right aspect ratio. Want 9:16 at a decent size? That's 768×1365, then fix it because it isn't a multiple of 8, then re-fix it. NO8D-Empty latent is the wrapper that does that arithmetic for you - you pick an aspect ratio and a short side, and it hands you a latent plus the exact width and height it used, in case anything downstream needs the numbers.

It's a thin node, and it's honest about being one: it delegates to ComfyUI's native EmptyLatentImage. What it adds is the ratio logic on top. The author's own description says it plainly - "choose dimensions, then create the latent with ComfyUI's native EmptyLatentImage node" - so don't expect anything magical, just fewer wrong-sized batches.

The inputs that matter

• aspect_ratio - seven presets: 1:1, 1:2, 2:3, 3:4, 4:5, 9:16, 9:21. Pick the shape, not the numbers.
• short_side - how big, from 512 up to 1536. This is the shorter edge; the long edge is derived to keep the ratio exact.
• invert_ratio - flips the selected ratio between portrait and landscape. Select 2:3 and invert, and you get 3:2. Handy when you're doing a batch of both orientations.
• manual_short_side / manual_long_side - leave both at 0 and the node derives everything from the presets. Set one and it derives the other from the ratio; set both and you get exactly that. Both clamp to multiples of 8 for you.
• batch_size - how many latents in the batch, default 1. For a run of variations this is how you get N images from one generation.

Outputs are latent, width, and height. Wire the latent into your sampler's latent input. The width/height outputs are the quiet selling point - they give you the exact pixel dimensions as real values, which is what you need if you're also sizing a reference image or a mask to match.

Where it fits

In a plain text-to-image workflow it replaces the core Empty Latent Image node without a second thought. Where it actually shines is when you're iterating on composition: you want to flip a 9:16 to 16:9, or test the same prompt at 512, 768, and 1024 short sides. The presets make that a two-click change instead of an arithmetic session, and the invert_ratio toggle handles the portrait/landscape flip that trips people up in the core node.

Install and gotchas

Same pack install as every NO8D node - ComfyUI Manager, search "NO8D-controls":

cd ComfyUI/custom_nodes
git clone https://github.com/no8d/ComfyUI-NO8D-controls.git
python -m pip install -r requirements.txt

No models, no downloads. One thing worth knowing: the default short side is 512, which is fine for SD1.5-era checkpoints but small for modern bases - a Krea 2 or Flux family model will want 896 or 1024 on the short side. And the old-style width/height widgets from earlier releases get migrated into the new ratio controls automatically, so a saved workflow won't lose its dimensions on update. If a generation comes out smaller than you expected, check which short side is selected - that's the whole story.