Web Calculator & Highlighter

Instantly calculate numbers you see online. Sum numbers, columns, rows, and highlight text. No more copy-pasting!

Transform Your Browser into a Smart Calculator & Annotation Tool! Web Calculator & Highlighter tool 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. • Draw, annotate, or highlight text on webpages with emojis. • Dark mode for comfortable day/night use with a toggle. • Keyboard shortcuts for fast toggling and productivity. 💡 How it works: 1. Once added/installed, click the extension icon to open it. 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. Select Draw mode to draw arrows, rectangles, annotate to highlight directly on the page. Privacy: Uses Google Analytics (GA4) for anonymized usage stats only. No personal data collected at all.