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Online Protractor is a browser-based online protractor tool for students, teachers, designers, engineers, and DIY users. It allows users to upload photos, diagrams, screenshots, or technical drawings, place a protractor and rays on the canvas, calculate angles in real time, and export the results for assignments, reports, or technical documentation.
The product is centered around ray-based measurement: users place multiple rays from the center of the protractor, and the angles between adjacent rays are calculated automatically. It supports degrees and radians, inner and outer angle display, and precision from 0 to 4 decimal places. It also supports image uploads such as PNG and JPG, with options to move, scale, rotate, and adjust transparency. The multi-protractor feature is useful for comparing multiple angles within the same image, while angle snapping, grids, rulers, zooming and panning, undo/redo, and keyboard shortcuts improve day-to-day usability. For export, it supports CSV, JSON, PNG, and JPEG, allowing users to save the full workspace or generate materials for reports.
The core tool is free to use, requires no installation, and does not force registration. Exports are watermark-free. Users who want to remove ads can sign in with Google and make a one-time payment of $4.99. Payments are processed by Creem, and the official documentation states that full card information is not stored. Overall, its business model is very lightweight and is not a typical per-seat enterprise SaaS subscription.
Its strengths are that it is easy to get started with, focused in functionality, free to use, and most measurement processes are completed locally in the browser. Images and workspaces are not uploaded to the server by default, which reduces privacy concerns. It is practical for classroom demonstrations, quick drawing checks, design review, and simple quality inspection records. Its limitations are in enterprise software capabilities: the main content does not mention team collaboration, role-based permissions, SSO, audit logs, APIs, compliance certifications, or private deployment. Measurement reliability also depends on image clarity, shooting angle, and manual alignment, so it cannot replace serious engineering measurement tools.
It is suitable for individuals and small teams that need to quickly and affordably measure angles in on-screen images, especially in education, design review, engineering sketch checks, woodworking and DIY, and lightweight documentation scenarios. It is not suitable for organizations that require CAD-level precision, enterprise-grade permission governance, or system integration.
The main content does not provide information about access from mainland China, and login depends on Google, so the actual account upgrade process may be uncertain. Its access status in China is assessed as unknown.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on onlineprotractor.org official site.
onlineprotractor.org is an Unknown Online Tools provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach onlineprotractor.org directly.