Common SDXL Resolutions

SDXL was trained at 1024x1024 and likes a specific family of sizes around it. This node is that family, on a plate: nine preset dimensions from 640x1536 portrait to 1536x640 landscape, each one a native-adjacent size SDXL handles well. Pick one, and you get the width, height, aspect ratio, and orientation out the other side.

If you've spent any time fighting SDXL artifacts - squished faces, stretched anatomy, doubled limbs - you already know why this exists. SDXL punishes off-native aspect ratios harder than SD 1.5 did. A dropdown of known-good sizes is the fast path to not re-learning that lesson every session.

How it works

One required input, dimensions, an enum of nine presets, each labeled with its pixels and aspect:

• 640 x 1536 (5:12 Portrait) through 1024 x 1024 (1:1 Square) up to 1536 x 640 (12:5 Landscape)

Choose one and the node splits it into four outputs: width and height as INTs (ready for Empty Latent), aspect ratio as a STRING like 7:4, and orientation as landscape, portrait, or square. The parsing is straightforward string work - no hidden rounding, no surprises.

Inputs and outputs

• dimensions - one required enum, 9 presets.
• width, height - INT outputs → Empty Latent.
• aspect ratio, orientation - STRING outputs → Save Image metadata.

The honest take

The aspect ratio and orientation outputs are the reason this node pairs so well with the pack's Save Image: they get stamped into every file's metadata, which is a genuinely nice workflow when you're producing across orientations. But be clear-eyed about scope - these are SDXL sizes. On SD 1.5 you'd rather stay around 512–768 territory, and on modern flow-matching models the rules are different again. For SDXL, though, this is a great default: don't think, just pick the closest preset and go.

One thing to note: the presets stop at 640 on the short side and 1536 on the long side, which is a deliberate native-range choice, not a limitation you need to fight. If you genuinely need bigger, the sibling HelperNodes_WidthHeight lets you go to 16384.

Install

Search ComfyUI-Helper-Nodes in ComfyUI Manager, or:

cd ComfyUI/custom_nodes
git clone https://github.com/teward/ComfyUI-Helper-Nodes

Restart afterwards. The pack's dependencies - numpy, pillow, piexif, whratio - install through Manager; no model files to fetch.

Troubleshooting

The usual gotcha is wiring the outputs into a non-SDXL workflow and wondering why quality drops - that's a model-choice problem, not a node bug. And if aspect ratio or orientation don't appear where you expected, remember they're separate outputs: width and height go to Empty Latent, the strings go to Save Image.