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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.

💡 Got watermarks that Gemini Watermark Remover can't handle? Try the general-purpose AI watermark remover: pilio.ai/image-watermark-remover

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:

# repo-local
node bin/gwr.mjs remove <input> --output <file>

# installed globally
gwr remove <input> [--output <file> | --out-dir <dir>] [--overwrite] [--json]

If you do not have gwr installed globally, use:

pnpm dlx @pilio/gemini-watermark-remover remove <input> --output <file>

The default CLI file decoder/encoder uses sharp. SDK consumers that only use browser or ImageData APIs do not need it. If you use the CLI file path in your own project, install sharp alongside this package:

pnpm add sharp

Can't Remove Your Watermark?

This tool targets Gemini's visible watermark (the semi-transparent logo in the bottom-right corner). If your image watermark doesn't match a known Gemini format, or you need to remove other types of image watermarks, try the general-purpose AI watermark remover:

👉 pilio.ai/image-watermark-remover

Developer Preview

The repository still keeps a local internal preview harness at /dev-preview.html for single-image comparison, copy, and download verification.

• This is a retained internal debugging surface, not the public product website.
• The root path / now only redirects users toward the official website, the userscript artifact, and the internal preview page.
• Public-facing usage should prefer the official website or the userscript instead of this local preview harness.

Development

# Install dependencies
pnpm install

# Development build
pnpm dev

# Production build
pnpm build

# Local static serving
pnpm serve

Notes:

• The root path / is now a lightweight entry page that points to the official website, the userscript artifact, and the retained internal preview page.
• The internal browser preview harness lives at /dev-preview.html, is now kept as a static Chinese-only single-image compare harness for local algorithm/UI debugging, and no longer maintains public-facing locale or theme-switching features.
• pnpm dev / pnpm serve still host the userscript, probe pages, and these static assets.

Tampermonkey Debugging on macOS

For the repo's fixed-profile workflow on macOS:

# Build the latest userscript
pnpm build

# Start a local dist server if needed
pnpm dev

# Open the fixed Chrome profile with remote debugging enabled
./scripts/open-fixed-chrome-profile.sh --url https://gemini.google.com/app

Notes:

• the fixed profile lives under .chrome-debug/tampermonkey-profile
• default CDP port is 9226
• default proxy is http://127.0.0.1:7890; disable it with --proxy off if not needed
• reinstall the latest userscript from the active local pnpm dev server
• pnpm dev starts probing from http://127.0.0.1:4173/ and auto-increments if that port is already occupied
• if you are following a previously captured debugging session, its port may differ; trust the current pnpm dev output instead of hardcoding 4173

SDK Usage (Advanced / Internal)

The package root still exposes an SDK, but this path is intended for advanced or internal integration scenarios:

import {
  createWatermarkEngine,
  removeWatermarkFromImage,
  removeWatermarkFromImageData,
  removeWatermarkFromImageDataSync,
} from '@pilio/gemini-watermark-remover';

Use the pure-data API when you already have decoded ImageData:

const result = await removeWatermarkFromImageData(imageData, {
  adaptiveMode: 'auto',
});

console.log(result.meta.decisionTier);

Use the browser image API when you have an HTMLImageElement or HTMLCanvasElement:

const { canvas, meta } = await removeWatermarkFromImage(imageElement);
document.body.append(canvas);
console.log(meta.applied, meta.decisionTier);

If you need to process many images, reuse a single engine instance so alpha maps stay cached:

const engine = await createWatermarkEngine();
const first = await removeWatermarkFromImageData(imageDataA, { engine });
const second = await removeWatermarkFromImageData(imageDataB, { engine });

For Node.js integrations, use the dedicated subpath and inject your own decoder/encoder:

import { removeWatermarkFromBuffer } from '@pilio/gemini-watermark-remover/node';

const result = await removeWatermarkFromBuffer(inputBuffer, {
  mimeType: 'image/png',
  decodeImageData: yourDecodeFn,
  encodeImageData: yourEncodeFn,
});

Runtime Requirements

Web And Userscript

• modern Chrome / Firefox / Safari / Edge class browser
• ES modules
• Canvas API
• Async/Await
• TypedArray (Float32Array, Uint8ClampedArray)
• for the website copy button: navigator.clipboard.write(...) and ClipboardItem

CLI And Skill

• a local Node.js runtime c