Aspect Ratio
Canvas proportions in Nano Banana Pro 2—what the picker offers vs. extra ratios in Google’s Gemini image API.
Ratios available in this app
The editor’s aspect ratio control matches the product configuration:
| Ratio | Typical use |
|---|---|
1:1 | Avatars, Instagram square, icons |
3:4 / 4:3 | Print-friendly portrait / landscape stills |
2:3 / 3:2 | Classic photo proportions |
16:9 | Thumbnails, slides, desktop banners |
9:16 | Shorts, stories, vertical social |
21:9 | Cinematic letterbox, ultrawide |
If a workflow doc mentions 4:5 (common on some social apps), it is not in the current picker—use 3:4 or 9:16 and crop in post if the platform demands 4:5.
Official Gemini / Nano Banana ratios (API reference)
Google documents additional aspect ratios for Gemini 3.1 Flash Image preview, including 1:4, 4:1, 1:8, and 8:1 alongside the usual set. Those are relevant when calling the API directly; the in-app list may be a subset. Full tables and pixel sizes are in Gemini API — image generation.
How ratio affects composition
Square (1:1) pulls attention to the center; edge detail competes with the middle.
Ultrawide (21:9) rewards layered depth; a single tiny subject often feels lost.
Vertical (9:16) suits one hero subject, product macros, or layouts with top/bottom UI safe zones.
Ratio and lens language
Ratio and “lens feel” are independent but interact: wide-angle language reads strongest in 16:9 / 21:9; compression language reads clearest in taller frames like 2:3 / 3:4.
Related
- Quality for 1K / 2K / 4K output.
- Create your first image for a first-session checklist.