A high-performance, 100% client-side tool for removing the visible Google Gemini ✦ AI sparkle watermark from both images and videos. Built with Vue 3 + Vite + Tailwind CSS, it uses a mathematically precise Reverse Alpha Blending algorithm to restore pixels with zero quality loss.

🔗 Live Website: removewatermark.dev

Before (watermarked)	After (cleaned)

The live site also shows this as an interactive drag-to-compare slider.

• Images & Videos: Remove the sparkle watermark from Gemini images and videos — all in the browser.
• 100% Client-Side Processing: No servers involved. Files are processed locally for maximum privacy.
• Lossless Image Restoration: Uses exact mathematical inversion rather than AI inpainting, preserving original pixel quality.
• Audio-Preserving Video Cleaning: Videos are processed frame-by-frame and re-encoded with their original audio intact (via MediaRecorder + Web Audio).
• Auto-Detection: Automatically detects watermark size (48px or 96px) based on resolution.
• Mobile Responsive: Fully optimized UI for desktop and mobile devices.

Gemini adds watermarks using a standard Alpha Compositing (blending) technique. This tool simply reverses that math.

When Gemini generates an image, it applies the watermark logo using this formula:

$$Pixel_{final} = (\alpha \times Pixel_{logo}) + (1 - \alpha) \times Pixel_{original}$$

Where:

• α (Alpha): The transparency level of the watermark pixel (0.0 to 1.0).
• Pixel_logo: The color of the watermark (Pure White / 255).
• Pixel_original: The original color we want to recover.

Since we know the Pixel_final (from your uploaded image), the Pixel_logo (White), and the α map (extracted from reference images), we can solve for Pixel_original:

$$Pixel_{original} = \frac{Pixel_{final} - (\alpha \times Pixel_{logo})}{1 - \alpha}$$

The tool loads two reference "background" images (bg_48.png and bg_96.png) which contain the isolated watermark alpha values. It reads these values to construct a precise Float32Array map of transparency levels, allowing for pixel-perfect subtraction.

The homepage tool is a Vue 3 + Vite app. All SEO/content pages (about, blog, etc.) remain static HTML in public/ and are copied verbatim into the build.

gemini-watermark-remover/
├── index.html              # Vite entry — SEO <head> + Vue mount point
├── vite.config.js
├── tailwind.config.js
├── postcss.config.js
├── src/
│   ├── main.js             # Vue bootstrap
│   ├── App.vue             # Layout + image/video tab switcher
│   ├── style.css           # Tailwind directives + custom CSS
│   ├── components/
│   │   ├── SiteHeader.vue / SiteFooter.vue / NotificationBanner.vue
│   │   ├── BeforeAfter.vue     # Drag-to-compare showcase
│   │   ├── ImageRemover.vue    # Image tool (uses original engine)
│   │   ├── VideoRemover.vue    # NEW video tool
│   │   └── SupportPopup.vue
│   └── engine/
│       ├── alphaMap.js     # Transparency value calculation
│       ├── blendModes.js   # Reverse Alpha Blending math
│       ├── watermarkEngine.js  # Image engine (asset loading & processing)
│       └── videoEngine.js  # NEW per-frame video engine (+ audio)
└── public/                 # Copied as-is to /dist
    ├── about.html, contact.html, terms.html, privacy-policy.html
    ├── blog/ …
    ├── assets/             # bg_48.png, bg_96.png, before.png, after.png, og-image.jpg
    ├── fonts/, favicons, robots.txt, sitemap.xml, llms.txt, site.webmanifest
    └── css/output.css      # Tailwind build for the static pages (generated)

• Vue 3 (Composition API, <script setup>)
• Vite for dev/build
• Tailwind CSS (via PostCSS)
• Iconify for icons, JSZip (lazy-loaded) for bulk image download.

npm install

# Build the Tailwind CSS for the static SEO pages once (or `npm run watch:css`)
npm run build:css

# Start the Vite dev server for the homepage tool
npm run dev

This tool is for educational and personal use only.

• It only removes visible watermarks; it does not remove invisible SynthID watermarks embedded by Google.
• Please respect Google's Terms of Service and Intellectual Property rights.

This tool is free, open source, and has no ads or paywalls — and it will stay that way. If it saved you time, a small donation helps renew the domain, build new free open-source tools, and occasionally buys me a tea or a meal ☕

UPI donations work with Indian bank accounts (INR). Supporting from outside India? Patreon has you covered.

• Developed by Abhin Krishna.
• Image algorithm adapted from GeminiWatermarkTool.
• Video watermark-removal pipeline follows GargantuaX/gemini-watermark-remover (MIT) — a WebCodecs decode → per-frame removal → MP4 re-encode flow with audio passthrough, powered by the mediabunny library.