100% private
Your images never leave your computer. No upload, no server.
Batch watermark your photos. In seconds.
Drop your photos, add your logo, download. Everything happens in your browser — your images never leave your computer.
Try for free Free to start · Pro at €9/month
A tool to boost your daily life.
Your photos
Drop all your photos into Stamp.Ninja at once.
Your logo
Add your logo, pick position and size. Your settings are saved for next time.
Download all
Get your watermarked, optimized photos in one click.
Why Stamp.Ninja?
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Settings remembered
Position, size, logo: everything is saved between sessions.
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Batch processing
100 photos watermarked in seconds, no manual work.
Choose your plan
| Free | Pro — €9/month | |
|---|---|---|
| Photos | Max 3 | Unlimited |
| Batch processing | ✓ | ✓ |
| Logo position | 4 corners | 9 positions |
| Logo size | M only | S, M, L, XL |
| Settings remembered | ✓ | ✓ |
Pro subscription managed via a magic link sent by email — no account, no password.
They use Stamp.Ninja every day
"I used to watermark photos one by one in Photoshop. With Stamp.Ninja, 200 photos are ready in 2 minutes. I'll never go back."
— Photographer
"Stamp.Ninja has become a reflex before every listing. Simple, fast, and my visuals look so much more professional."
— Real estate agent
"I was worried my images might be stored somewhere. Everything happens in my browser — that's reassuring. And the result is flawless."
— E-commerce seller
"My settings are saved every session — nothing to reconfigure. That's exactly what I needed."
— Content creator
"We watermarked our entire product catalog in one afternoon. For €9/month, the ROI is obvious."
— Marketing manager