Pinterest 3:2 Aspect Ratio in Nano Banana (Setup Guide)

The phrase "Pinterest 3:2 aspect ratio in Nano Banana" gets typed a lot, and almost every time it hides the same mix-up: Pinterest's recommended Pin shape is 2:3 (vertical), not 3:2 (landscape). Both ratios exist in Nano Banana (Google supports them as separate options), so the question worth answering is which one you actually want and how to set it correctly the first time.

This guide separates what Pinterest officially recommends from what Nano Banana officially supports, then walks through the studio setup so the export hits the feed without cropping.

TL;DR

• Pinterest's documented recommendation for standard Pins is a 2:3 aspect ratio at 1000 × 1500 pixels (vertical). 3:2 is the same numbers flipped to landscape, and is not the recommended Pin shape.
• Nano Banana (Gemini 3 Pro Image and Gemini 3.1 Flash Image) supports both 2:3 and 3:2 alongside eight other ratios, set via the aspect_ratio API parameter, not via prompt text.
• For Pinterest pins, generate at 2:3 in 2K (or 4K if you want headroom) and export. For landscape "fact card" style Pins or hero images repurposed elsewhere, 3:2 is fine.
• Nano Banana cannot reliably honor an aspect ratio request typed inside the prompt. The parameter is what counts.

Why everyone types "3:2" when they mean 2:3

Aspect ratio notation is width:height. "3:2" is landscape (3 wide × 2 tall). "2:3" is vertical (2 wide × 3 tall). Pinterest's feed is mobile-first and vertical, so the recommended Pin shape is the vertical 2:3 (1000 × 1500 px). The number sequence sticks in memory more easily than the orientation, which is how landscape "3:2" ends up in a search query when the person actually wants a tall Pin.

If your goal is standard Pin performance, you want 2:3 inside Nano Banana. If your goal is a landscape graphic you'll repurpose on Pinterest as part of a wider asset, 3:2 is fine and Nano Banana supports it directly.

What Pinterest actually recommends

Pinterest's own ad spec documentation is consistent on this point. The recommended standard Pin format is:

• Aspect ratio: 2:3
• Pixel dimensions: 1000 × 1500 px
• Max file size: 20 MB (desktop), 32 MB (in-app upload)

Pins taller than ~1:2.1 get truncated in the feed. Square (1:1) and landscape (3:2 / 16:9) Pins display fine, but they take less feed real estate than vertical 2:3.

For Idea Pins (the full-screen, multi-page format), Pinterest recommends 9:16 at 1080 × 1920 px, a separate format from the standard Pin.

Source: Pinterest Business help, Review ad specs.

What Nano Banana officially supports

Google's Nano Banana image generation documentation lists the supported aspect ratios for both current models:

Resolutions: 512 px (Flash only), 1K, 2K, 4K. Pixel counts scale with both ratio and tier. 16:9 at 1K is 1344 × 768 in Google's docs; 2K and 4K scale from there.

The implementation detail that matters: aspect ratio is set via the aspect_ratio field inside image_config on the API call. Google's prompting guide treats aspect ratio as a model parameter, not a prompt instruction. Typing "make this a vertical Pinterest pin" in the prompt is unreliable; setting aspect_ratio="2:3" produces a predictable result.

image_config = types.ImageConfig(
    aspect_ratio="2:3",
    image_size="2K"
)

Source: Google AI for Developers, Nano Banana image generation and the Google Cloud ultimate prompting guide for Nano Banana.

Picking the right Nano Banana ratio for Pinterest

Map the asset to the ratio before you generate:

For the bulk of Pinterest creative (recipe pins, listicle covers, infographic teasers, product Pins), 2:3 at 2K is the default. 4K is overkill for Pinterest alone but worth it if the asset doubles for print or a high-DPI marketing site.

Studio setup: generating a 2:3 Pin in Nano Banana

The mechanics are the same in the Nano Banana studio, Nano Banana Pro, Google AI Studio, or a direct API call:

1. Pick the model. Nano Banana 2 is the cheaper, faster option. Nano Banana Pro handles the same ratio with native 4K and better text rendering, which helps with Pins that have on-image headlines.
2. Set aspect ratio to 2:3. Dropdown in a UI; image_config.aspect_ratio = "2:3" in the API. Don't rely on prompt phrasing.
3. Set resolution to 2K (or 4K for downstream reuse).
4. Prompt for content, not ratio. Describe subject, lighting, composition, and on-image text. The parameter handles ratio.
5. Export. Pinterest accepts the 2K file directly; downscale to 1000 × 1500 if you want lighter uploads.

For Pin designs with heavy on-image text, Nano Banana Pro's text rendering is the standout. See our Nano Banana Pro vs GPT Image comparison for the head-to-head.

Resolution: why 2K beats 1K for Pin clarity

Pinterest's 1000 × 1500 is a floor, not a ceiling. The platform serves Pins on Retina, large desktop browsers, and tablets where the rendered Pin runs closer to 1500 px tall. Generating at Nano Banana's 1K tier (roughly 832 × 1248 for 2:3) and then upscaling for reuse adds a step and risks softness.

Generating at 2K (roughly 1664 × 2496 for 2:3) gives crisp display at any rendered size, a clean downscale to 1000 × 1500 for upload, and headroom for repurposing the source as a 9:16 Idea Pin variant. 4K is worth the cost only when the same asset has a print or large-format use case.

Workflow: generate → export → upload

1. Generate at 2:3 / 2K. One generation per Pin variant.
2. Save the master. Keep the 2K original for resizes, A/B tests, or republishing.
3. Export. Upload the 2K file directly (well within Pinterest's 20 MB limit) or downscale to 1000 × 1500.
4. Upload as a standard Pin via the web uploader, mobile app, or scheduler.
5. For Idea Pins, regenerate at 9:16. Don't crop a 2:3 source; run a fresh generation at the right ratio so the composition is built for the frame.

Claimed vs confirmed

• Confirmed by Pinterest: Standard Pins recommended at 2:3 / 1000 × 1500 px. Idea Pins at 9:16 / 1080 × 1920 px. Source: Pinterest Business help.
• Confirmed by Google: Nano Banana models support 2:3, 3:2, and the other ratios listed above directly. The ratio is set via the aspect_ratio parameter in image_config. Source: Google AI for Developers.
• Claimed but not officially benchmarked: That 2:3 Pins outperform 1:1 or 3:2 in Pinterest's algorithm by a specific multiplier. Pinterest documents that other ratios "may negatively impact performance" and that pins beyond ~1:2.1 get truncated, but does not publish a numeric engagement delta.
• Claimed but inconsistent: That writing the aspect ratio in the prompt forces Nano Banana's output. Google's own prompting guide treats aspect ratio as a parameter; community reports show prompt-only requests are unreliable. Use the parameter.

Frequently asked questions

Is Pinterest's recommended Pin ratio 2:3 or 3:2?

2:3, vertical. Width:height, so 2:3 is taller than wide (1000 × 1500 px); 3:2 is the same numbers flipped to landscape (1500 × 1000 px). Both are supported, but 2:3 is what Pinterest's ad spec page lists as recommended for standard Pins.

Does Nano Banana support 3:2 directly?

Yes. Both Gemini 3 Pro Image (Nano Banana Pro) and Gemini 3.1 Flash Image (Nano Banana 2) list 3:2 among the supported ratios. Set aspect_ratio="3:2" on the API call or pick 3:2 from the studio dropdown.

Can I just type "Pinterest pin" in the prompt and let Nano Banana figure out the ratio?

In practice, no. Google's prompting guide treats aspect ratio as a model parameter. Prompt phrasing sometimes nudges the output; the aspect_ratio field is the reliable control.

What resolution should I generate at for Pinterest?

2K. Pinterest's floor is 1000 × 1500; 2K (~1664 × 2496 at 2:3) gives clean display on Retina and a clean downscale for upload. 4K is overkill unless the asset doubles for print.

Why does my Pin look cropped on Pinterest?

Most common cause: generating at 1:1 or 16:9 and uploading anyway. The feed allocates space for 2:3, so squarer or wider images take less screen real estate. Regenerate at 2:3.

Should I use Nano Banana or Nano Banana Pro for Pin design?

Nano Banana 2 handles most Pin styles cleanly at 2K. Nano Banana Pro wins when on-image text matters: recipe headlines, infographic labels, multilingual posters. See Nano Banana Pro for the capability detail.

Try it free

The fastest way to see the difference is to generate the same Pin at 2:3 and at 3:2 and compare them side by side in the Pinterest mobile app. The Nano Banana studio on gptimg.co lets you switch ratios and resolutions from a dropdown, with no API setup and free trial credits on signup. For text-heavy Pin designs, switch to Nano Banana Pro from the same dropdown.

Sources

• Pinterest Business help, Review ad specs: official Pin and ad format dimensions
• Google AI for Developers, Nano Banana image generation: supported aspect ratios and image_config parameter reference
• Google Cloud, Ultimate prompting guide for Nano Banana: aspect ratio as model parameter, not prompt instruction

Last reviewed against source pages: 2026-04-18. Pinterest spec recommendations and Nano Banana supported ratios change periodically; confirm in the linked sources before acting on the numbers above.