Hey Product Hunt! 👋

I’m Uthaya, the maker of UnWatermarkGemini (https://unwatermarkgemini.com/).

Whenever creators, designers, or developers export visual assets from Google Gemini (2.5 Flash / 3 Pro), Nano Banana, Imagen 3, Veo 3, Google Flow, or Gemini Notebook Video Overviews, a visible bottom-right sparkle or badge is composited onto the frame.

Until now, if you wanted a clean corner for a presentation deck, UI mockup, or video edit, you had two flawed choices:

1. Cloud AI Magic Erasers: They delete the entire corner and use a diffusion model to guess replacement pixels—leaving blurry smudges over fine typography, hair, and architectural edges (while uploading your private files to third-party servers and charging credits).

2. Cropping: Slicing off 6%–12% of the frame ruins your composition and breaks standard 16:9 or 9:16 aspect ratios.

### 💡 Why UnWatermarkGemini is different: Exact Inverse Alpha Math

Because Google composites a translucent white overlay (`RGB 255, 255, 255`, peak opacity `α ≈ 0.502`) using linear alpha blending:

`Blended = α × 255 + (1 − α) × Original`

The true original pixels are still mathematically encoded inside your file! Instead of guessing with AI inpainting, UnWatermarkGemini solves the exact algebraic inverse across every RGB channel:

`Original = clamp((Blended − α × 255) / (1 − α), 0, 255)`

### 🚀 What we’re launching today:

* 🎯 Deterministic Pixel Recovery (~99.8% PSNR): Restores the true underlying grain, text, and linework in `<50ms` per image with zero generative hallucination.

* 🎬 Veo 3, Google Flow & Notebook Video Remover: Frame-by-frame alpha unblending paired with 3-frame temporal smoothing to eliminate H.264/VP9 macroblock flicker—while keeping your original audio track 100% untouched.

* 🔒 100% Browser-Local Privacy: Powered by HTML5 Canvas 2D and WebCodecs inside volatile browser RAM. Zero server uploads, zero queues, and it even works offline once loaded.

* 📐 Calibrated 1K & 2K Multi-Model Detection: Automatically detects both standard `48×48px` (@ 32px margin) and high-res 2K `96×96px` (@ 64px margin) sparkles, plus an interactive Live Alpha & X/Y Offset Tuner for cropped or WhatsApp-compressed files.

* 🛠️ Open-Source Developer Toolkit (Userscript + Node.js CLI):

* Tampermonkey / Chrome Userscript: Hooks directly into `gemini.google.com` and `aistudio.google.com` so previews, clipboard copies, and native downloads are cleaned automatically.

* Zero-Install Node.js CLI: Batch-clean local directories and 4K Veo 3 clips from your terminal via `pnpm dlx gemini-watermark-remover`.

* 🛡️ Respects Provenance: Only reverses the visible translucent corner graphic to recover obstructed artwork—it never strips or alters Google's invisible cryptographic SynthID metadata.

Try it right in your browser (we included 1-click live Cosmic Nebula & 16:9 studio samples so you don't even need a file handy):

👉 https://unwatermarkgemini.com/

I’d love to hear your feedback, edge cases, or feature requests in the comments! 🙌