Pixel-Perfect Reverse Alpha Blending
A calibrated alpha map mathematically reconstructs the pixels beneath the Gemini logo. No AI model, no soft edges — exact pixel restoration every time.
100% Browser-Local · Zero Upload · Always Free
Remove Gemini
Watermarks Instantly
Pixel-perfect removal of Gemini's Nano Banana, star overlay, and logo watermarks — powered by reverse alpha blending, running entirely in your browser.
No sign-up required
Images never leave your device
JPG · PNG · WebP · Batch
Drop Gemini images here
or click to browse · JPG, PNG, WebP · Batch supported
Processed locally in your browser — your files never touch our servers
Simple Process
Remove watermarks in 3 steps
1
Upload Image
Drag & drop or click to select your Gemini-generated JPG, PNG, or WebP
2
Auto-Remove
Reverse alpha blending reconstructs covered pixels — no server, no AI guesswork
3
Download Clean
Save as lossless PNG individually or bundle multiple as ZIP
~1s
per 1MP image
100%
browser-local
∞
no usage limits
0
files uploaded to servers
Why Choose This Tool
Everything you need. Nothing you don't.
Built specifically for Gemini AI watermarks — precise, private, and completely free.
Instant Processing — ~1s per Image
Leverages the browser's native Canvas API for millisecond-speed processing. No queue, no wait, no server round-trip. Results appear as fast as you can click.
100% Private — Zero Uploads
All computation happens in your browser. Your images never leave your device. No server, no cloud, no third-party ever sees your files.
Batch Processing with ZIP Download
Drop multiple Gemini images at once. They process in parallel in-browser. Download each file individually or bundle them all into a single ZIP archive.
JPG · PNG · WebP — Lossless Export
Accepts all common Gemini output formats. Exports lossless PNG to preserve every pixel of your cleaned image with zero quality loss.
Completely Free — No Hidden Costs
No account, no payment, no usage cap, no watermarks added to your output. Open source under MIT license. Use it as much as you want, forever.
Userscript for Gemini Pages
Install via Tampermonkey or Violentmonkey and watermarks are automatically removed on Gemini pages in real time. Copy and Download output clean results natively.
Cross-Platform & Mobile-Ready
Verified on Chrome, Firefox, Safari, and Edge including mobile browsers. Works on Windows, macOS, Linux, iOS, and Android. No installation needed.
Nano Banana, Star Overlay & More
Covers the standard Gemini logo, the star overlay variant, and Nano Banana outputs from Gemini 2.0 Flash Experimental and similar models that share the same overlay pattern.
Learn More
What is the Gemini Watermark?
The Nano Banana Watermark
Google Gemini AI models — particularly Gemini 2.0 Flash Experimental and related variants — stamp a visible watermark on generated images. This watermark is commonly known by its internal codename: Nano Banana.
It typically appears as the Gemini star logo or a multicolor star overlay, composited at a fixed opacity in the corner of the image. Because the blending parameters are deterministic, they can be mathematically reversed.
This tool uses reverse alpha blending to reconstruct exactly the pixels that were hidden — not AI inpainting, not cropping. The result is pixel-for-pixel restoration of the original generated image.
How Reverse Alpha Blending Works
// Standard alpha compositing:
Result = Watermark × α + Original × (1 − α)
// Reverse alpha blending:
Original = (Result − Watermark × α) / (1 − α)
Because Gemini composites its logo at a known, calibrated opacity (α), we can algebraically solve for the original pixel values. The result is mathematically exact — no estimation, no blurring.
This is fundamentally different from AI inpainting tools that guess what was under the watermark. This tool knows.
Got Questions?
Frequently asked questions
Yes — completely. No account, no payment, no usage limit. Use it as many times as you want with no restrictions or hidden fees.
Never. Every operation runs in your browser using the native Canvas API. Your files stay on your device at all times — nothing is ever sent to any server.
It uses reverse alpha blending. Because Gemini composites its logo at a known, calibrated opacity, we can mathematically invert that blending to recover the original pixels exactly — no AI model, no guesswork, no blurring.
Nano Banana is the internal code name for the visible watermark that Google Gemini (e.g. Gemini 2.0 Flash) adds to AI-generated images. It appears as the Gemini star logo or multicolor star overlay in the image corner. This tool removes it completely and precisely.
Yes. Drop multiple images at once — they're processed in parallel in your browser. Download each file individually, or use the "Download All" button to get a ZIP archive of all cleaned images.
No. This tool targets only Gemini's visible watermarks. SynthID is an invisible signal embedded across pixel values throughout the entire image — removal would require degrading image quality and is outside the scope of this tool.
Verified on Chrome, Firefox, Safari, and Edge — including mobile versions. Works on Windows, macOS, Linux, iOS, and Android. No installation required; just visit the page and start removing watermarks.
This tool works with Gemini 2.0 Flash Experimental, Gemini 2.5 Flash, and other Gemini models that use the standard Nano Banana star overlay pattern. If a model uses a different watermark style, open a GitHub issue with a sample image.
Ready to clean your Gemini images?
Free · Instant · Private — no account needed, no files uploaded.
Remove Watermark Now