How to Remove Gemini Watermark from AI Images
A complete guide to removing the visible sparkle logo from Nano Banana and Gemini-generated images.
What You Need to Know
Every image generated through Google Gemini (using the Nano Banana or Nano Banana 2 model) includes a small sparkle (✦) logo in the bottom-right corner. This visible watermark is applied via alpha blending — a compositing technique that overlays the logo semi-transparently onto the image.
Our tool reverses this process mathematically, recovering the original pixels beneath the watermark. No cropping, no inpainting — just clean, precise restoration.
Step-by-Step Guide
Step 1: Open the Tool
Visit aiwatermarkcleaner.com in any modern browser (Chrome, Safari, Firefox, Edge). No installation or sign-up required.
Step 2: Upload Your Image
You have three ways to add your image:
- Drag & Drop — Drag the image file anywhere on the page
- Click to Browse — Click the upload area to select a file
- Paste — Copy an image and press Ctrl+V (or Cmd+V on Mac)
Supported formats: PNG, JPG/JPEG, WebP. You can upload multiple files for batch processing.
Step 3: Review the Result
The tool automatically detects the watermark position using NCC (Normalized Cross-Correlation) and removes it using reverse alpha blending. This typically takes about 1 second.
Use the interactive before/after slider to compare the original and cleaned image.
Step 4: Download
Click Download PNG to save the watermark-free image. If you processed multiple images, use Save All to download them all at once.
Why This Method Is Different
Most watermark removal tools use inpainting or cropping, which either guess at the hidden pixels or lose part of the image. Our approach is fundamentally different:
- Mathematically exact — Reverse alpha blending inverts the compositing formula to recover the original pixel values
- No AI guessing — Unlike inpainting, there's no neural network estimating what might be underneath
- Edge-aware — Handles the gradient alpha values at watermark edges for seamless results
- Lossless output — Results are saved as PNG with no additional compression
See a detailed comparison of all 5 removal methods →
Tips for Best Results
- Use PNG originals — JPEG compression introduces artifacts that can slightly affect restoration quality
- Don't pre-edit — If you've already cropped or resized the image, the watermark position detection may be less accurate
- Check the slider — Always use the before/after comparison to verify the removal quality
Privacy & Safety
Your images are never uploaded to any server. All processing happens locally in your browser using the Canvas API. We don't collect, store, or transmit any image data.
The invisible SynthID watermark (developed by Google DeepMind for AI content detection) is not affected by this tool and remains intact after processing.
Watermark Specifications
- Images ≤ 1024px — 48×48px sparkle logo, positioned 32px from bottom-right corner
- Images > 1024px — 96×96px sparkle logo, positioned 64px from bottom-right corner
- Applied to all free-tier and Pro Gemini users (Ultra and AI Studio users are exempt)
Read Next
If you want to go beyond the basic workflow, these pages answer the next questions people usually have after their first cleanup.