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Gemini Watermark Remover — Lossless Watermark Removal Tool

An open-source tool to remove Gemini watermarks from AI-generated images with high-fidelity, reproducible results on supported outputs. Built with pure JavaScript, the engine uses a mathematically exact Reverse Alpha Blending algorithm instead of unpredictable AI inpainting.

🚀 Looking for the Online Gemini Watermark Remover (Recommended)? Try geminiwatermarkremover.io — free, no install, works directly in your browser.

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Features

• ✅ 100% Local Processing - All image processing happens locally in your browser or on your machine. Nothing is uploaded.
• ✅ Mathematical Precision - Based on the Reverse Alpha Blending formula, not "hallucinating" AI models.
• ✅ Auto-Detection - Automatically identifies watermark size and position using Gemini's known output catalog and local anchor search.
• ✅ Flexible Usage - Online tool for quick use, Chrome extension or userscript for seamless Gemini page integration, CLI and Skill for scripting and automation.
• ✅ Video Support - Remove watermarks from Gemini-generated videos at geminiwatermarkremover.io/video.
• ✅ Cross-Platform - Works in modern browsers (Chrome, Firefox, Safari, Edge) and Node.js environments.

Gemini Watermark Removal Examples

Original Image	Watermark Removed

⚠️ Disclaimer

[!WARNING] USE AT YOUR OWN RISK

This tool modifies image files. While it is designed to work reliably, unexpected results may occur due to:

• Variations in Gemini's watermark implementation
• Corrupted or unusual image formats
• Edge cases not covered by testing

The author assumes no responsibility for any data loss, image corruption, or unintended modifications. By using this tool, you acknowledge that you understand these risks.

[!NOTE] Note: Disable any fingerprint defender extensions (e.g., Canvas Fingerprint Defender) to avoid processing errors. https://github.com/GargantuaX/gemini-watermark-remover/issues/3

How to Remove Gemini Watermarks

Online Gemini Watermark Remover (Recommended)

For all users — the fastest and easiest way to remove Gemini watermarks from images:

1. Open geminiwatermarkremover.io.
2. Drag and drop or click to select your Gemini-generated image.
3. The engine will automatically process and remove the watermark.
4. Download the cleaned image.

Online Video Watermark Remover (New!)

For Gemini-generated videos with visible watermarks:

1. Open geminiwatermarkremover.io/video.
2. Upload or drag-and-drop your Gemini-generated video.
3. The tool will automatically detect and remove the watermark from the video.
4. Download the cleaned video.

Note: Video watermark removal runs entirely in your browser — no files are uploaded to any server.

Chrome Extension

Use this if you do not want a userscript manager but still want automatic Gemini page integration for previews, copy, and download actions.

1. Open Gemini Watermark Remover on the Chrome Web Store.
2. Click Add to Chrome and confirm the install.
3. Open Gemini. The extension will automatically process supported Gemini images.

The popup includes an "Enable on Gemini" toggle. If Gemini becomes slow, behaves unexpectedly, or you need to troubleshoot the page, turn the toggle off and refresh Gemini.

Chrome Web Store installs update automatically. If the Web Store is not reachable in your network, the matching verified zip (gemini-watermark-remover-extension-v*.zip) remains available from GitHub Releases and the official website download entry for manual unpacked installation.

Userscript

1. Install a userscript manager (e.g., Tampermonkey or Greasemonkey).
2. Open gemini-watermark-remover.user.js.
3. The script will install automatically.
4. Navigate to Gemini conversation pages.
5. Eligible Gemini preview images on the page are replaced in place after processing.
6. Gemini's native "Copy Image" and "Download Image" actions also return processed results.

Current userscript boundaries:

• no injected per-image controls
• no popup UI or bulk action surface
• page previews and native copy/download flows are both processed when the source image is reachable
• preview images keep the original visible while processing, with a subdued Processing... overlay
• if preview processing fails, the original page image stays visible and usable

Skill

For workflows that involve AI coding agents:

• skills/gemini-watermark-remover/ contains a packaged Skill that agents can discover and invoke.
• Install it with skills.sh using:

pnpm dlx skills add GargantuaX/gemini-watermark-remover --skill gemini-watermark-remover

• Add flags like --agent, --yes, or --copy only if your local setup needs them.
• Usage:

node skills/gemini-watermark-remover/scripts/run.mjs remove <input> --output <file>

• See SKILL.md for agent integration details.

CLI

For scripting, CI, and local batch workflows, use the direct CLI:

This is the beginning of the README. Read the rest at the original. Read the full README ↗