Gemini Watermark Remover
Free online tool to remove Gemini watermarks, logos, and star overlays.
No upload, no sign-up — 100% local, private processing.
Drop Your Image Here
or click to browse — PNG, JPEG, WebP · Max 20 MB
Paste with Ctrl+V
Everything You Need
100% Local Processing
All computation happens inside your browser. Your images are never uploaded to any server.
Privacy FirstMathematical Precision
Based on Reverse Alpha Blending — the exact inverse of how Gemini applies watermarks.
Zero HallucinationsAuto-Detection
Identifies watermark size and position using Gemini's full official image size catalog.
Smart EngineLossless PNG Output
Export cleaned images as high-quality lossless PNG — no compression artifacts.
High QualityBefore & After Slider
Compare original and cleaned image side-by-side with an interactive drag slider.
Visual CompareCompletely Free
No sign-up, no credits, no subscriptions. The full engine is free to use indefinitely.
No CostRemove a Watermark in 3 Steps
Upload Your Image
Drag & drop, click to browse, or press Ctrl+V to paste.
Auto-Process
The engine automatically detects and removes the Gemini watermark using Reverse Alpha Blending.
Download PNG
Preview with the compare slider and download your clean, watermark-free lossless PNG.
Frequently Asked Questions
No. All processing happens 100% inside your browser using Canvas API and Web Workers. Your images never leave your device.
This specifically targets the visible semi-transparent Google Gemini sparkle watermark in the bottom-right corner of Gemini-generated images. It does not remove invisible SynthID watermarks.
Gemini applies its watermark using: watermarked = α × logo + (1−α) × original. Since the logo and alpha are known, we solve: original = (watermarked − α × logo) / (1−α). Mathematically exact — not AI-guessing.
Upload PNG, JPEG, or WebP. Output is always lossless PNG.
Yes, completely free. No account, no subscription, no usage limits.