Is Banana Unmask free?

Yes, Banana Unmask is 100% free and open source. No accounts, no subscriptions, no tracking. The code is available on GitHub.

Does Banana Unmask upload my images?

No. All processing happens entirely in your browser. Your images never leave your device. No servers, no uploads, no cloud processing.

Banana Unmask — Free Gemini AI Watermark Remover

Why Banana Unmask?

Everything You Need to Remove Gemini Watermarks

No other tool offers this combination of features — all completely free and open source.

Instant Watermark Removal

Uses reverse alpha blending to mathematically undo Gemini's watermark compositing. The original pixels are perfectly recovered — not painted over, not blurred, not approximated. Actually removed.

100% Offline & Private

All processing happens entirely in your browser. Your images never touch a server. No uploads, no cloud, no external APIs. Your images stay on your device — period.

Clipboard Paste (Ctrl+V)

No file picking needed — just copy an image from Gemini and Ctrl+V paste it directly into the tool. The fastest way to unmask a watermark. No competitor has this.

Right-Click Context Menu

Right-click any image on the web → "Unmask with Banana Unmask". No need to download the image first, no need to open the popup. One click, done. Chrome extension exclusive.

Smart Watermark Detection

Automatically detects whether a watermark actually exists before processing. Drop a clean image? It'll tell you "No watermark found — already clean!" instead of mangling your pixels.

Bulk Processing

Drop 50 images at once — they're all processed in parallel. Select which ones to download, then grab them all as a single ZIP file. Batch work, done in seconds.

Business Gemini Support

Works with images from both gemini.google.com (consumer) and business.gemini.google (Google Workspace). Automatically detects and handles both watermark variants.

Metadata Stripping

Every processed image is re-encoded through a clean canvas, removing all EXIF data, GPS coordinates, camera info, and AI generation metadata. What you download is a clean PNG — nothing more.

Online Tool

Remove Gemini Watermarks Right Here

No installation needed. Drop your image below and get a clean version instantly.

Drop your Gemini image here

or click to select · Ctrl+V to paste

PNG files only — downloaded via Gemini's download button

Your image is processed 100% locally in your browser. Nothing is uploaded anywhere.

How It Works

Remove Watermarks in 3 Simple Steps

No sign-ups, no installs, no waiting. Just clean images.

1

Get the PNG from Gemini

In Gemini, click the download button on your generated image. Don't right-click → "Save As" — that saves a JPEG which won't work.

→

2

Drop It Into Banana Unmask

Drag & drop, click to select, or Ctrl+V to paste your image into the tool above — or use the Chrome extension.

→

3

Download Your Clean Image

The watermark is removed instantly with zero quality loss. Download your clean, metadata-stripped PNG.

🔬 How Does It Actually Work?

Gemini applies watermarks using standard alpha compositing:

watermarked_pixel = α × white_logo + (1 - α) × original_pixel

Banana Unmask reverses this mathematical formula to recover the original pixel:

original_pixel = (watermarked_pixel - α × 255) / (1 - α)

Because this is a mathematical reversal, not a filter or AI guess, the original image is perfectly recovered with zero quality loss. The watermark reference images provide the exact alpha values needed.

Chrome Extension

Add Banana Unmask to Chrome

Get the full experience with right-click support, clipboard paste, and a persistent stats counter.

1

Download from GitHub

Go to the GitHub repository and click "Code" → "Download ZIP". Extract the ZIP file.

2

Open Chrome Extensions

Navigate to chrome://extensions in your browser. Enable "Developer mode" using the toggle in the top-right corner.

3

Load the Extension

Click "Load unpacked" and select the extracted folder (the one containing manifest.json). That's it — Banana Unmask is now in your browser!

Download Extension (ZIP)

Free forever · No Chrome Web Store needed · Open source

FAQ

Frequently Asked Questions

How do I remove a Gemini watermark from an image?

Drop your PNG image into the Banana Unmask tool (either the online version above or the Chrome extension). The watermark is removed instantly using reverse alpha blending — a mathematical reversal of how Gemini applied the watermark. Zero quality loss, 100% offline.

Is Banana Unmask really free?

Yes — 100% free, forever. No freemium, no "credits," no subscriptions. The entire source code is open source on GitHub. You can inspect it, modify it, or contribute to it.

Does it upload my images anywhere?

No. All processing happens entirely in your browser using JavaScript. Your images never leave your device. There are no servers, no cloud processing, no APIs. You can verify this by checking the source code or running the tool with your internet disconnected.

Why does it only work with PNG files?

Gemini's watermark is embedded using alpha blending, which requires the exact pixel data preserved in PNG format. When you save an image as JPEG (e.g., right-click → "Save image as"), JPEG's lossy compression destroys the watermark data structure, making mathematical reversal impossible. Always use Gemini's built-in download button to get the correct PNG file.

Does it work with Business Gemini / Google Workspace?

Yes! Version 1.1 supports both consumer Gemini (gemini.google.com) and Business Gemini (business.gemini.google). The tool automatically tries multiple watermark position variants to handle both platforms.

What if my image doesn't have a watermark?

Banana Unmask includes smart watermark detection. If no Gemini watermark is found, it will tell you "No watermark detected — this image is already clean!" and won't modify your image at all. This prevents accidental quality degradation.

Can I process multiple images at once?

Yes! Both the online tool and Chrome extension support bulk processing. Drop multiple images at once, and download them all as a single ZIP file. The Chrome extension also supports selecting which images to download.

Does it remove the invisible SynthID watermark?

No. Banana Unmask removes the visible Gemini watermark (the semi-transparent overlay in the bottom-right corner). SynthID is a separate, invisible watermark embedded at the frequency level of the image — it's a completely different technology that requires a different approach.

Open Source

Built in the Open

Banana Unmask is fully open source under the MIT License. Inspect the code, verify the privacy claims, suggest improvements, or fork it for your own use.

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