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Image Line Measurement App

Measure distances directly on an image by first setting a reference line and length, then drawing as many measured lines as you like. Fast, offline-friendly, and works on desktop or mobile.

Screenshot

Try It

Tip: load a photo, Set Reference Line, enter the real-world length, then use Measure Line. Labels show values in your chosen unit.

Features

• Reference line with user-defined real length (any unit).
• Unlimited measured lines with crisp labels.
• Drag endpoints to refine, select lines to highlight, Undo and Delete support.
• Color pickers for reference / measured / hover states.
• Adjustable label font size; touch support for mobile.

Controls & Workflow

1. Load Image — choose any local image.
2. Set Reference Line — draw the baseline and enter its real length.
3. Measure Line — draw lines to read their real-world values.
4. Use color pickers, font size, Undo, and Delete Line as needed.

Video Demo

Notes

• All processing happens locally in your browser; images aren’t uploaded.
• If labels look small, increase the Font Size in the toolbar.
• For best accuracy, zoom your image and place endpoints carefully.