Nano Banana Bulk Image Generation on Google Flow: Complete Guide

Image work on Google Flow has a different shape from video, but it hits the same wall at scale. One prompt, one image: easy. A product catalog, a style exploration, a hundred variations for a moodboard: suddenly you are typing prompts, clicking generate, waiting, and downloading tiles one by one until your wrist gives out. The models are fast; the manual interface around them is not.

This guide covers Nano Banana bulk image generation on labs.google/flow using Flow Automation, a free Chrome extension that turns the whole repetitive loop into a single queued run. You will batch Text to Image and Image to Image prompts across Imagen 4, Nano Banana 2 and Nano Banana Pro, request multiple variations, and have every image auto-download into an organized folder. Flow Automation is built independently and is not affiliated with Google.

Why bulk image generation needs automation

Images are cheap to generate but expensive to manage when there are a lot of them. The real cost in a big image run is not the model — it is the human overhead wrapped around each one. A 200-image moodboard done manually is 200 type-generate-wait-download-rename cycles, and the moment you step away to grab coffee, a finished batch sits undownloaded.

Batching the repetitive layer flips that:

• Volume without fatigue: a queue of 200 prompts runs unattended instead of as 200 manual cycles.
• Variation on tap: request several outputs per prompt and capture them all, so picking the best is a review step, not a re-run.
• Organized by default: every image lands in a named folder with a prefix and clean, sequential filenames.
• Reproducible sets: your prompt list is a reusable document — re-run it with a different model or aspect ratio to compare looks.

What Flow Automation does for images

Flow Automation is a Chrome side-panel tool that performs Flow's image clicks for you inside your own signed-in session — no API key, no scripting. For images it covers two of the five generation modes:

• Text to Image — generate images from a written prompt, requesting multiple variations per prompt and downloading them all.
• Image to Image — feed an existing image plus a prompt to transform, restyle or edit it, batched across as many sources as you like.

You choose the image model — Imagen 4, Nano Banana 2 or Nano Banana Pro — and control aspect ratio, outputs per prompt, image download quality, concurrency, retries and pacing. A live progress bar with done/running/queued counts and a scrolling action log track everything as it runs. Image quality (1K/2K/4K) is set independently from video quality, so your image and video workflows never step on each other.

Step-by-step: batch images on Google Flow

1. Install the extension. Add Flow Automation from the Chrome Web Store — it is free to install.
2. Open Google Flow signed in. Visit labs.google/flow in a tab where your Google account is logged in. A Google AI plan may be required by Google to generate.
3. Dock the side panel. Click the extension icon to open the panel beside your Flow tab, and set theme and language to taste.
4. Add your image prompts. Paste a list — one prompt per line — or import an XLSX/CSV where each row is a prompt with its mode read per row. Group them into a reusable project.
5. Choose Text to Image or Image to Image. For Image to Image, attach the source images you want transformed.
6. Pick the image model. Select Imagen 4, Nano Banana 2 or Nano Banana Pro, depending on what your Flow account exposes and the look you want.
7. Set outputs and aspect ratio. Decide how many variations per prompt to request and pick 16:9, 9:16 or 1:1 framing.
8. Set image quality. Choose 1K, 2K or 4K download quality — this is independent from any video quality setting.
9. Configure the folder. Name the Downloads subfolder (default Flow-Automation), add an optional filename prefix, and enable automatic renaming for clean, sortable files.
10. Tune reliability. Set concurrency, a maximum retry count, and a randomized delay between prompts so long runs stay stable.
11. Hit Run. The extension submits each prompt, waits, retries failures, and auto-downloads every image. Watch the progress bar or come back to a full folder.

Image models and settings at a glance

Setting	Options	What it controls
Mode	Text to Image / Image to Image	Generate from text, or transform an existing image.
Image model	Imagen 4 / Nano Banana 2 / Nano Banana Pro	The look and capability of every image in the batch.
Aspect ratio	16:9 / 9:16 / 1:1	Landscape, vertical or square framing.
Outputs per prompt	1 or more	How many variations Flow returns per prompt.
Image quality	1K / 2K / 4K	Download resolution (independent of video quality).
Concurrency	Sequential / parallel	How many generations run at once.
Max retries	Configurable	How many times a failed image is retried before skipping.
Prompt delay	e.g. 20–30s random	Randomized wait between submissions for stable long runs.
Folder & prefix	Named / prefixed	Where files save and how they are named.

Best practices for bulk AI images

• Draft prompts in a spreadsheet. Planning in XLSX/CSV lets you set the mode per row and import a large prompt set in one go — ideal for catalogs and style sweeps.
• Run a small test first. Generate five prompts sequentially to confirm the model and framing look right before launching the full set.
• Ask for variations on key prompts. Multiple outputs per prompt turn selection into a quick review instead of repeated manual re-runs.
• Compare models on the same list. Re-run an identical prompt set on Imagen 4 versus Nano Banana Pro into separate folders to see which suits the project.
• Match resolution to purpose. Use 1K/2K for thumbnails and exploration, 4K for hero or print-bound assets, to keep file sizes reasonable.
• One project per deliverable. Reusable projects with their own folder and prefix keep client A's images from mixing with client B's.
• Keep the Flow tab open. State survives side-panel reloads and MV3 worker restarts, but the Flow tab must stay open for the queue to keep running.

Manual image work vs. batching with Flow Automation

Task	Manual on Google Flow	With Flow Automation
Generating 100 prompts	100 type-and-click cycles	One import or paste, one Run
Variations per prompt	Re-run each prompt by hand	Set outputs per prompt, all downloaded
Downloading images	Click each finished tile	Auto-download as each image finishes
Naming and sorting	Manual rename per file	Named folder, prefix, automatic renaming
Failures	Spot it, retry manually	Automatic retry up to your max, logged
Comparing models	Tedious to keep separate	Re-run the same list into a new folder

Who this is for

Marketers and ad creatives generate dozens of image variations for A/B testing, organized by campaign. Designers and art directors build moodboards and style explorations in a single run, with several takes per concept. Researchers and prompt engineers sweep large prompt sets from a spreadsheet and capture every output with consistent filenames for systematic comparison. Agencies and studios deliver high-volume image sets per client without manual clicking, each in its own named, prefixed folder. If your work is more about motion, pair this with our guide on batching Veo 3 videos on Google Flow.

Frequently asked questions

What is Nano Banana and how does it relate to Imagen 4?

On Google Flow, images can be generated with Imagen 4, Nano Banana 2 or Nano Banana Pro. Flow Automation lets you pick whichever your account exposes and run it across an entire batch of prompts at once.

Can I generate images in bulk from a spreadsheet?

Yes. Import an XLSX or CSV where each row is a prompt and the generation mode is read per row, or paste a list with one prompt per line. The queue then runs the whole set automatically.

What image resolutions can I download?

Image download quality is set independently at 1K, 2K or 4K, so you can match resolution to how each image will be used without affecting any video settings.

How do I get multiple variations of the same image prompt?

Set the number of outputs per prompt above one. Flow returns several variations for each prompt and the extension downloads them all, so you can choose the best without re-running by hand.

Do the images download automatically?

Yes. The moment Flow finishes an image, the extension saves it to a named subfolder of Downloads (default Flow-Automation), with an optional filename prefix and automatic renaming so files stay sorted.

Can I transform existing images in bulk?

Yes. Image to Image mode takes an existing image plus a prompt to restyle or edit it, batched across as many source images as you like.

Is Flow Automation affiliated with Google?

No. Flow Automation is an independent Chrome extension and is not affiliated with, endorsed by, or sponsored by Google. "Google Flow" and "Veo" are trademarks of Google LLC. For higher-volume needs, see Flow Automation pricing.