Preset Ratio Selector (Mikey)

If you've ever wired up an SDXL workflow by hand, you know the annoying part isn't picking a resolution - it's that SDXL's conditioning needs four pairs of width/height, not one. Your latent needs a width and height. The Clip Text Encode (SDXL) node wants a separate width/height (the "size the model thinks it's generating at" hint), a target width/height (usually the same or larger), and crop coordinates. Get any of those out of sync with your actual latent size and you get the classic SDXL weirdness - soft detail, odd cropping behavior, compositions that don't match what you asked for. Preset Ratio Selector exists to make that whole mess a single dropdown.

Pick a preset from select_preset - the pack ships with a big list (twenty-plus entries) built from a ratio_presets.json file contributed by a community member (masslevel, per the README), covering the officially recommended SAI resolutions with correctly matched clip-text-encoder and target sizes already worked out. You don't have to know SDXL's trained aspect ratios by heart; they're baked into the choices. It outputs eight integers in one shot: latent_w, latent_h, cte_w, cte_h, target_w, target_h, crop_w, crop_h - wire all eight to their matching slots on your Empty Latent Image and Clip Text Encode (SDXL) nodes and you're done.

Two extra controls worth knowing: swap_axis rotates the whole selection 90 degrees, so you don't need separate portrait and landscape entries in the list - pick your ratio, flip the axis if you want it tall instead of wide. And use_preset_seed, paired with the seed input, lets the node pick a preset based on the seed number instead of you choosing manually - useful if you're batch-generating and want resolution variety that's still reproducible per seed, rather than randomizing it separately.

You can also add your own entries via a user_ratio_presets.json file you create yourself in ComfyUI's root directory - the README shows the exact JSON shape expected.

Installing it

Install the whole Mikey Nodes pack - there's no per-node install. Through ComfyUI Manager, search "Mikey Nodes." Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/bash-j/mikey_nodes

Restart ComfyUI. No models or extra dependencies required - this node is pure arithmetic and JSON lookup, and the ratio_presets.json file it reads ships inside the repo itself.

Common issues

The most common mistake is only wiring up some of the eight outputs - say, just latent_w/latent_h into your Empty Latent, while leaving the Clip Text Encode's own width/height/target fields at their node defaults instead of the matching preset values. That defeats the point of the node; SDXL's conditioning wants those numbers to agree with your actual generation size, and mismatches are exactly the kind of subtle-but-real quality hit that's easy to miss because nothing throws an error, the image just looks a bit worse than it should.

The other one: if you go looking for user_ratio_presets.json expecting it to already exist, it won't - you have to create it yourself in ComfyUI's root folder, following the format in the README. Skipping that step just means select_preset only shows the built-in list, which is usually plenty, but it's worth knowing the customization path exists if you have a specific resolution you keep re-typing elsewhere.