Fast, Lightweight PDF Markups & Takeoffs in Your Browser
Review drawings, calibrate scales, perform linear and area takeoffs, and export marked-up PDFs. Free in public beta with zero heavy desktop installs.
Engineered for Architectural Plans
Review submittals, verify dimensions, and estimate quantities directly inside your browser.
Linear Distance
Measure room dimensions, corridor widths, and structural spans with high-contrast architectural tick marks.
Polygon Area
Click boundary vertices around rooms, building footprints, and landscape zones to calculate total square footage.
Reference Calibration
Click two reference points (such as door openings or gridlines), enter the true distance, and lock the drawing scale.
PDF Markup Export
Generate clean submittal markups and tender takeoffs with baked-in vector dimension lines ready to share.
Built for Speed and Reliability
Designed to simplify drawing reviews without heavy desktop CAD software.
Instant Scale Calibration
Set drawing scales across metric and architectural units (m, mm, cm, ft, in) using any known dimension or scale bar.
Linear & Area Takeoffs
Calculate point-to-point lengths, cumulative wall runs, and complex polygon floor areas with instant centroid readouts.
Vector PDF Export
Bake dimension lines, tick marks, and area badges directly into a new downloadable PDF using client-side vector processing.
All Drawings Stay Local
Your drawings never leave your machine. Calculations and PDF modifications execute directly in your browser.
Smart PDF Detection
The measurement HUD activates automatically when opening local or online architectural PDF plan sets in Chrome.
Ortho Snap & Precision Controls
Hold Shift to lock segment angles to 0°, 90°, 180°, and 270° orthogonal axes for accurate drafting alignment.
Keyboard Shortcuts
Control your measurements quickly with simple keyboard shortcuts.
| Shortcut | Action | Description |
|---|---|---|
| Alt + M | Toggle Scalr HUD Overlay | Open or close the measurement interface instantly. |
| Shift (Hold) | Lock Ortho Angle | Snap lines and polygon segments to 90° axes. |
| Enter / Double-Click | Complete Polygon | Close the active polygon boundary to calculate total area. |
| Esc | Cancel / Reset | Cancel the active measurement draft and return to Idle mode. |
Get Started in 3 Steps
Install directly from the Chrome Web Store and start reviewing drawings.
Enable Local PDF Access
Open chrome://extensions, click Details on Scalr, and enable 'Allow access to file URLs' to review offline drawings.
Calibrate & Measure
Open any PDF drawing in Chrome. Press Alt + M to launch the HUD, set your scale, and start taking off dimensions.
