What You Need Before Installing?
The extension is a standard Chrome Web Store extension. Before installing, confirm the following:
- You are using Google Chrome, or a Chromium-based browser such as Microsoft Edge, Brave, Opera, or Vivaldi
- Your browser is up to date (Chrome 88 or later is sufficient)
- You have access to the Chrome Web Store — this requires being signed into a Google account in Chrome, or using a browser that supports the Web Store
On iPhone, Android, or Firefox? Mobile Chrome and Firefox do not support extensions. Use our browser-based Watermark Removal tool instead — it works in any browser on any device, no installation required.
How to Add the Gemini Watermark Remover Extension — Step by Step
The installation takes under two minutes. You only do this once — everything after step 3 is automatic.
Open the Chrome Web Store listing
Click the button below to open the official Gemini Watermark Remover listing on the Chrome Web Store. You can also search "Gemini Watermark Remover" directly in the Web Store.
mkjocjnlgfdbmpfmcilhmaoeoofeomll — you can use this to verify you are installing the correct extension from the correct publisher.
Click "Add to Chrome"
On the Web Store listing page, click the blue Add to Chrome button in the top-right area of the page. Chrome will display a permissions dialog.
Click "Add extension" to confirm
In the permissions dialog, click Add extension. Chrome installs the extension in under two seconds. A small confirmation notification will appear in the top-right of your browser window.
Open Gemini or Google AI Studio and generate images
Navigate to gemini.google.com or aistudio.google.com and generate your images exactly as you normally would. Nothing about your workflow changes — the extension runs silently in the background.
Click the download button — the image arrives already clean
Click the download button on any generated image. The extension intercepts the file in milliseconds, applies reverse alpha compositing to remove the Nano Banana watermark, and delivers a clean PNG to your downloads folder.
How the Extension Works After Installation
Understanding the technical process helps you get consistent results and troubleshoot if something looks off.
The Download Interception Process
When you click the download button on a Gemini-generated image, Chrome initiates a file download. The extension intercepts this download using Chrome's webRequest API before the file is written to disk. It reads the raw image binary, applies the watermark removal calculation, and substitutes the cleaned file — all within the same download action. The interception takes under 100 milliseconds.
The Reverse Alpha Compositing Calculation
Gemini adds the watermark using a fixed formula: final_pixel = (alpha × 255) + (1 − alpha) × original_pixel. Because the alpha map — the opacity value at each pixel position — is identical for every Gemini image, this formula can be inverted exactly: original_pixel = (final_pixel − alpha × 255) ÷ (1 − alpha). The recovered pixel values are within ±1 per channel of the originals — imperceptible even at full zoom.
Automatic Watermark Size Detection
Gemini generates images at two different watermark sizes depending on output dimensions: 48×48 pixels for smaller images and 96×96 pixels for larger ones. Applying the wrong alpha map produces visible colour fringing. The extension detects the correct size variant for each image automatically — no configuration is needed from you.
100% Local Processing — No Data Leaves Your Browser
All computation runs inside your browser. The image data is never transmitted to any server — not for processing, not for logging, not for any reason. You can verify this in Chrome DevTools: open the Network panel, make a download, and observe that no outbound requests are made during processing.
Don't want to install an extension?
The online tool removes the same watermark with the same technology — works on any browser and any device, no install needed.
Understanding the Chrome Extension Permissions
When you install any Chrome extension, Chrome displays a permissions dialog that lists what the extension is allowed to access. Here is a precise breakdown of what the Gemini Watermark Remover extension requests and why.
| Permission | Status | Why it is needed |
|---|---|---|
| Read and change data on gemini.google.com | Required | Allows the extension to intercept image downloads on the Gemini website and substitute the cleaned file before it reaches your disk. |
| Read and change data on aistudio.google.com | Required | Same as above, for Google AI Studio. Both domains are listed explicitly so the extension cannot activate on any other site. |
| Access to browsing history | Not requested | The extension does not request and cannot access your browsing history. |
| Access to passwords or other sites | Not requested | No access to login credentials, cookies, or any website outside the two listed domains. |
Inspect the source yourself. In Chrome, go to chrome://extensions, find Gemini Watermark Remover, click Details, then Pack extension / View source. The processing code is readable JavaScript — you can confirm exactly what it does before trusting it with your downloads.
How to Remove the Extension?
To uninstall the Gemini Watermark Remover extension from Chrome:
- Right-click the extension icon in your Chrome toolbar and select Remove from Chrome
- Or go to
chrome://extensions, find Gemini Watermark Remover, and click Remove - Confirm the removal in the dialog that appears
No data is stored or left behind after uninstallation. The extension holds no local storage, no preferences, and no cached files — removing it is a clean operation.
If you want to temporarily pause the extension without uninstalling it, click the toggle switch next to it in chrome://extensions to disable it. Downloads will pass through unmodified while it is disabled.
What the Extension Removes — and What It Does Not
The extension removes the visible Nano Banana star watermark — the semi-transparent star overlay in the bottom-right corner of every Gemini-generated image. This is the only layer it affects.
Two other layers exist in Gemini images that the extension does not touch:
- C2PA content credential — an invisible cryptographic metadata tag embedded in the file. This is what triggers "Made with AI" labels on Instagram, LinkedIn, and Pinterest, even after the visible watermark is removed. To strip this, use the AI Metadata & Prompt Scrubber.
- SynthID — a signal embedded by Google DeepMind at the frequency-data level of the image. No pixel-level tool or metadata tool can remove SynthID. It is entirely separate from both the visible watermark and the C2PA metadata.
Complete workflow: Use the extension (or online AI watermark cleaner) to remove the visible watermark from photo, then run the cleaned image through the AI Metadata Scrubber to strip the C2PA credential if you need to prevent "Made with AI" labels on social platforms.