Works entirely offline
No internet required. Measure on site, in the garage, or mid-flight.
Measure anything in your photos
Measure anything in any photo.
No tape measure? No problem. Snap a photo or import one from your library, set a reference you already know the size of, and get real-world lengths, angles, and areas — drawn right on the image.
Free · Works offline · Metric & imperial
Stop guessing
"About this big" isn't a measurement.
Furniture that won't fit. Walls you can't reach with a tape. A listing photo you need dimensions from. Image Ruler turns any photo into a precision tool — as long as you have one known reference in the frame, you can measure everything else.
How it works
One reference line.
Every measurement at real scale.
Place a reference on something you already know the size of — a credit card, a door, a brick. Every ruler, angle, and area you draw after that is calculated automatically in true scale. Fast, visual, and dead simple.
What you can measure
Four tools. One photo.
Ruler
Measure distances and lengths anywhere on the image.
Arrow
Annotate with clear, directional measurements.
Angle
Measure the angle between any two lines in seconds.
Area
Tap points to outline a surface and get its real area.
Built for precision
Pro features. Zero learning curve.
Metric & imperial
Switch units instantly. Use whatever you're comfortable with.
Pinch to zoom
Place points with pixel-perfect accuracy when it matters.
Undo & redo
Made a mistake? Step back. Experiment freely.
Hide your reference
Toggle the reference line on or off for clean exports.
Camera or library
Shoot fresh or measure from photos you already have.
Perfect for
When you need numbers, not estimates
- Furniture & fit checks
- Home renovation & DIY
- Real estate & listings
- Room layouts & floor plans
- Garden & outdoor spaces
- Art & framing
- Engineering & site photos
- Anything in a picture
Three steps
Photo in. Measurements out.
Open your photo
Take a new shot or pick one from your library.
Set your reference
Draw a line on something you know the real size of.
Measure everything else
Ruler, arrow, angle, or area — all at true scale.
Your pocket ruler.
Any photo. Any size.
Download free. Measure your first image in under a minute.
See it in action
Measure on the image itself
For best accuracy, keep your reference object and what you're measuring on the same plane, with the camera roughly parallel to both. Perspective distortion affects results. Measurements are estimates based on the reference you provide.