- Private: files never leave your device
- Free, no sign-up
- Fast, works offline once loaded
How to use Measure Image Tool
- Drop a picture into the box.
- Click and drag to draw a line along what you want to measure. The length in pixels and the angle appear.
- For real units, enter a known length for the last line and choose a unit. All lines update.
About this tool
Measure distances inside any picture. Draw as many lines as you like and read the length in pixels and their angles. To convert to real-world units, draw one line along something whose size you know (a ruler or a coin), type its length and every other measurement is scaled to match.
It is useful for design checks, DIY projects, interior planning and craft work. All measuring is done locally in your browser.
Frequently asked questions
How do I measure something in a photo?
Draw a line across it. Then calibrate with a known length to get real units.
How accurate is it?
As accurate as your reference. Photos taken straight-on with the reference at the same distance give the best results.
Can I measure angles?
Yes. Each line shows its angle.
Is Measure Image Tool really free?
Yes. You can use Measure Image Tool as often as you like with no sign-up, no watermark and no daily limit.
Are my images uploaded to a server?
No. Measure Image Tool runs entirely in your web browser, so your files stay on your own device and are never sent to DEWANARO or anyone else.