Protect Your 3D Model STL Files with Watermarks
A free and powerful tool by PrintBusters to add invisible watermarks and prove ownership of your 3D designs. No signup required. Your files are never stored.
Important:
This tool is provided as-is. Watermarks can help support an ownership claim, but they do not guarantee legal protection and they do not prevent copying.
You are responsible for how you use the tool and for respecting other people's rights.
PrintBusters is not responsible for losses, disputes, or damages arising from use of this tool.
See the Protect STL disclaimer.
How It Works
Invisible & Safe
Protects your files with an invisible watermark that won't change how your model looks or prints.
Durable & Secure
The watermark is designed to be durable and includes a timestamp to help prove your ownership.
Protect Your STL File
Choose an STL file to add a watermark. The watermarked file downloads automatically.
This name is embedded in the watermark to help prove ownership.
Validate a Protected STL
Choose an STL file to check whether it contains a valid watermark.
Frequently Asked Questions
No. The changes made are microscopic and won't affect how your model looks or prints.
The watermark is designed to be resilient against many common 3D model edits. However, no watermark is unbreakable. This tool is designed to deter casual copying and help you prove ownership.
File size: Binary STL files up to 2MB are supported.
Model complexity: The tool works best on models that aren't overly simple. Most standard 3D models will work perfectly.
Model complexity: The tool works best on models that aren't overly simple. Most standard 3D models will work perfectly.
Yes, completely free with no registration required. Protect unlimited STL files up to 2MB each.
Use Case: This tool helps you prove ownership of your 3D designs when sharing them online.
Secure & Private: Files are processed on our server and immediately discarded. We never store your models.
Always keep backup copies of your original files.