Legal Information
Terms & Conditions of Use
Effective Date: November 2026 · Domain: theprotractor.com
1. Acceptance of Terms
By accessing and using The Protractor (https://theprotractor.com), you agree to be bound by these Terms and Conditions of Use and our Privacy Policy. If you do not agree with any part of these terms, please discontinue use of the website.
2. Description of Service & Usage License
TheProtractor.com provides a browser-based interactive 180° and 360° digital protractor and angle measurement workspace. We grant you a free, non-exclusive, worldwide, revocable license to use the tool for personal, educational, academic, and commercial purposes, subject to these Terms:
- You may freely use PNG and JPG images exported from the tool in reports, academic papers, presentations, documentation, and commercial projects without attribution requirements.
- You may not scrape, mirror, redistribute, or resell the underlying source code, visual identity, or web application as a competing standalone service.
3. User Content & Client-Side Image Ownership
All images (JPG, PNG, WEBP) loaded into TheProtractor.com are processed exclusively within your local web browser memory and optional local IndexedDB storage.
Because your files are never transmitted to our servers, you retain 100% ownership, copyright, and responsibility for all images you upload and all annotated exports you generate. You represent that you have the lawful right to view and process any images you load into your browser workspace.
4. Measurement Accuracy & Engineering Disclaimer
While TheProtractor.com uses high-precision 64-bit floating-point vector trigonometry to calculate angles on a 2D coordinate plane, real-world measurement accuracy depends on external factors controlled by the user:
- Camera Perspective & Lens Distortion: Angles measured on photographs are accurate only when the camera sensor was parallel to the measured plane. Wide-angle lens barrel distortion or oblique camera angles can alter apparent angles in a photo.
- Uniform Image Scaling: To preserve geometric integrity, our tool locks image aspect ratios during resizing. Modifying an image's aspect ratio outside the tool prior to upload will distort angles.
- Physical Device Edges: When using Full-Screen Edge Placement on a smartphone or tablet, protective cases, curved display bezels, or camera bumps may offset the physical contact edge.
TheProtractor.com is provided as a general calculation and visualization aid and must not be used as the sole certified calibration instrument for safety-critical structural, medical, aviation, or industrial applications.
5. Local Data Persistence
Workspace state is stored locally in your browser's IndexedDB and localStorage for convenience. Browser vendors (such as Apple Safari under Intelligent Tracking Prevention) may periodically clear local storage after periods of inactivity, or when you clear browser cache. We are not responsible for loss of locally stored workspace state; always export important annotated diagrams using the Export button.
6. Disclaimer of Warranties & Limitation of Liability
TheProtractor.com is provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind, whether express or implied, including implied warranties of merchantability, fitness for a particular purpose, or non-infringement. In no event shall TheProtractor.com or its creators be liable for any direct, indirect, incidental, consequential, or special damages arising out of or in connection with the use or inability to use the tool.
7. Modifications to Terms
We reserve the right to update or modify these Terms & Conditions at any time. Updates will be posted on this page with an updated effective date. Continued use of the website following any changes constitutes acceptance of the revised terms.