Measure Image
Click points on a photo to measure distance, angle, area, perimeter or circle diameter, in pixels or in real units with a reference.
or browse filesdrop an image here or paste · see all measuring tools
Line size
Click points on a photo to measure distance, angle, area, perimeter or circle diameter, in pixels or in real units with a reference.
or browse filesdrop an image here or paste · see all measuring tools
Drag points to adjust - right-click deletesDrag points to adjust - delete with ×
This image measurement tool turns any photo into something you can measure. Click points directly on the picture to measure distances, angles, areas, perimeters and circle diameters. All five live in one tool, on the same image. Values appear instantly as labeled overlays, every point stays draggable for fine tuning, and the finished image downloads with the measurements drawn on it. Everything runs in your browser: no upload, no signup, and your plans or photos never leave your device.
Pixel mode measures raw pixel distances between any two points on the image, which is ideal for design work, screenshots, UI checks and anywhere you need to measure pixels in an image exactly. For real-world sizes, switch to Real units and calibrate: make your first measurement across something with a known length (a ruler in the photo, a door frame, a sheet of paper), type in its true size, and choose cm, mm, m, in or ft. From that single reference, every distance, area and perimeter on the image converts automatically. The calibration note even tells you the precision per pixel and warns you when a reference is too short to trust.
Each measurement type has its own simple gesture: two clicks for a distance, three clicks for an angle (the middle click marks the corner), three clicks on the rim of anything round for a circle and its diameter, and a series of clicks closed back on the starting point for an area or perimeter polygon. Mix them freely on one image. Measure a room's width, its floor area and a corner angle on the same floor plan, and every measurement automatically gets its own color so lines never blur together. You can rename any of them right in the list (Wall, Door, Plot A) and the name is drawn next to its value on the image. Made a mistake? Drag any point to adjust it, right-click a point to remove a measurement, or clear everything and start over.
Need the angle of something in a photo? Three clicks work like a protractor laid over the image: click one arm, then the corner, then the other arm, and the degrees appear instantly at the vertex. It is an angle calculator that works from the image itself, no printing or tracing. People use it to check roof pitches, furniture and joinery angles, bike frame geometry, joint angles in sports and physio photos, and machined parts against their drawings. Every arm stays draggable, so you can fine-tune the reading until the lines sit exactly on the edges. The same closed-shape gesture turns the tool into an area calculator from an image, too.
To measure a diameter online, choose Circle and click three points on the edge of the round thing. The tool fits the exact circle through them, marks its center and labels the diameter, with the radius being half. It works as a circle measurement tool for anything round in a picture: pipes and flanges, wheels, drilled holes in machined parts, logs, plates, pupils in clinical photos. A circle also makes the perfect reference for real units. Put a coin in the photo, measure it, type its true diameter, and every other measurement on the image converts automatically.
Floor plans and blueprints: room dimensions, wall lengths and floor areas from a scan, calibrated by one known measurement. Product photos: part sizes, mounting angles and clearances documented for reports. Research and education: specimen lengths, leaf areas, joint angles measured from lab photos. Maps and aerial shots: distances and plot areas scaled from a map's legend. Everyday questions too, like whether the furniture in a listing photo will fit the alcove you measured at home.
When the measuring is done, export the evidence. The photo downloads at its full original resolution with every line, polygon, circle, angle and value permanently drawn on it: PNG for crisp documentation, JPG for small files, WebP for the web. Or copy the annotated image straight to the clipboard and paste it into an email, a report or a chat. The values list stays visible while you work, and Copy values puts every name and measurement on the clipboard as plain text, so there is no transcribing numbers into your report.
Each measurement also has its own page that opens straight in that mode: distance, angles, radius and diameter, area and perimeter. For pixel positions there is the coordinate finder, and for a picture's own dimensions the image size finder. The full measuring collection shows them all side by side.
Add your photo, pick a measurement type, and click points on the image: two points for a distance, three for an angle, or a series of points closed into a shape for area and perimeter. Every value appears instantly on the image and in the list, and you can drag any point to fine-tune it.
Choose Angle, then click three points: the end of one arm, the corner, the end of the other arm. The angle at the middle point is calculated instantly and drawn on the image in degrees, like holding a protractor over the photo. Drag any of the three points to adjust the reading.
Choose Circle and click three points on the circle's edge. The tool fits the exact circle through them and shows the diameter at its center, with the radius being half. For real units, calibrate with a known size first. A coin in the photo works perfectly.
Switch to Real units and make your first measurement across something whose true size you know, like a ruler, a doorway or a sheet of paper. Enter that real length and pick a unit; every other measurement on the image is scaled from that reference automatically.
As accurate as your reference and your clicks. The tool shows the precision per pixel once calibrated and warns you when the reference is too short to be reliable. For best results use a long, clearly visible reference in the same plane as what you measure, since perspective and lens distortion affect photos taken at an angle.
Yes. Download exports the photo at full resolution with every measurement line, shape and value drawn on it, as PNG, JPG or WebP. You can also copy the annotated image straight to the clipboard for pasting into documents and chats.
Yes. It is free with no signup, and the whole measurement happens inside your browser. Your photo is never uploaded, so plans, documents and private pictures stay on your device.