Web Calculator with Highlighter

Instantly calculate numbers you see online. Sum rows/columns, highlight text, and annotate with a pen tool. No more copy-pasting!

Transform Your Browser into a Smart Calculator & Annotation Tool! Web Calculator with Highlighter revolutionizes how you interact with numbers and information online. Stop juggling browser tabs and external apps—get instant calculations and powerful annotation directly on any webpage. Features: • Click numbers, rows, or columns for instant sums, averages, medians, and more. • Built-in calculator for custom equations and advanced functions. • Pen & highlighter to draw, annotate, or highlight text on webpages. • Dark mode support for comfortable day/night use. • Keyboard shortcuts for fast toggling and productivity. 💡 How it works: 1. Once added/installed, click the extension icon or use the keyboard shortcut Alt+X. 2. Click numbers to get instant sums, averages, medians, and more. 3. Default mode is Freehand; switch to Row (key R) or Column (key C) mode anytime. 4. Use Custom Operation to enter and solve your own equations. 5. Toggle Pen Mode with the shortcut Alt+P to draw or highlight directly on the page. Privacy: Uses Google Analytics (GA4) for anonymized usage stats only. No personal data collected.