Ruler.im
Online Ruler: measure objects & images, coding by PM with AI
Ruler.im launched on January 6, 2026 with 10 votes, #1,059 of 14,585 launches that month and more than 90% of that year's launches.
What it does
Ruler.im helps you measure real-world items like shoe sizes or body measurements. It also lets you scale online images to actual centimeters or inches, making it easy to prep for printing or 3D modeling. Think of it as a calibrated digital canvas that restores objects to their true-to-life size on your screen, serving as a "what you see is what you get" tool for better communication.
Free Screen Ruler and Online Ruler for real objects and images. Calibrate your display, then measure actual size with X/Y guides in cm, mm, or inches.
Ruler.im combines an Online Ruler with a calibrated Screen Ruler and X/Y guides. Measure real objects or uploaded images at actual size, check width, height, and alignment, and read centimeters, millimeters, or inches directly on your display. Recalibrate the online ruler after changing browser zoom, switching monitors, rotating a phone, or opening the page on a different device. Real-size measurement depends on pixel density and zoom, so calibration keeps centimeter and inch marks aligned with the physical screen. A browser cannot reliably know the exact physical size of every display, the active zoom level, and the real pixel density at the same time. A standard credit card gives the…from ruler.im
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