Remove Gemini Watermark —
Instantly & Locally
Drop your Gemini image. The ✦ sparkle watermark is auto-detected and removed in one click. No upload, no AI, no registration.
Drop your Gemini image here
or click to browse
Original (with watermark)
Cleaned (watermark removed)
⚡ How Reverse Alpha Blending Works
Google Gemini composites a white ✦ sparkle logo onto the bottom-right corner of every generated image using alpha blending. This tool applies the exact mathematical inverse using calibrated alpha maps captured from real Gemini watermark images on black backgrounds — perfectly recovering the original pixel values beneath the watermark.
Two pre-baked alpha maps are embedded — 48×48 px (for shorter images where the longest side is under 1200 px) and 96×96 px (for wider or taller images). This covers all Gemini aspect ratios including 1:1, 4:3, 3:4, 16:9, 9:16, 21:9, 3:2, 2:3, 4:5, 5:4 at 1K, 2K and 4K. Auto-detection picks the correct map. No input needed. Pure maths. No AI. No uploads.
Why This Tool Is Different
Most tools inpaint and hallucinate. This one restores original pixels with maths.
- ✅Real calibrated alpha maps — sourced from actual Gemini watermark captures on black backgrounds. Matches the exact star shape and opacity values.
- ✅Max alpha ~50% — the Gemini sparkle is NOT 2-5% opacity as some claim; it's up to 50% at the star centre. The correct maps handle this precisely.
- ✅No server upload — Canvas API, 100% in-browser. Works offline after page load.
- ✅No AI inpainting — deterministic maths restores the actual pixel values, not a neural network guess.
- ✅Auto size detection — picks 48 × 48 or 96 × 96 mask based on longest image side, covering all Gemini aspect ratios (1:1, 16:9, 9:16, 21:9, 4:3, 3:4, 3:2, 2:3, 4:5, 5:4) at 1K, 2K, and 4K.
Precise Auto-Detection
Image size determines mask variant and corner margin. Upload → click → done.
Pixel-Perfect Maths
The inverse composite formula is applied per-pixel using the exact calibrated alpha map.
100% Private
Zero network requests during processing. Your images never leave your device.
Lossless PNG Output
Same resolution as input, no JPEG artefacts added. Download as lossless PNG.
Frequently Asked Questions
Everything you need to know about removing Gemini watermarks
How do I remove a Google Gemini watermark from an image? +
Drop your Gemini-generated image onto the tool above and click Remove Watermark. The ✦ sparkle watermark is automatically detected and removed in one click. No upload, no sign-up, no AI required — it all happens locally in your browser.
Is my image uploaded to any server? +
Never. All processing happens 100% locally in your browser using the HTML5 Canvas API. Your image never leaves your device and there are zero network requests during processing. Works offline after the page loads.
Does this use AI or machine learning? +
No AI is involved. The tool uses a deterministic mathematical technique — reverse alpha blending — with pre-calibrated alpha maps captured from real Gemini watermark images. This mathematically recovers the original pixel values, rather than guessing with a neural network. Result: pixel-perfect restoration.
What image formats are supported? +
PNG, JPG (JPEG), and WebP images are all supported as input. The output is always a lossless PNG at the same resolution as your original image — no quality loss, no JPEG compression artefacts added.
Is this tool really free? +
Yes, completely free — no hidden costs, no freemium limits, no account required, ever. The tool is supported by non-intrusive Google AdSense ads so we can keep it free for everyone.