Image Map Resizer JS

A compact tool to resize HTML image maps for responsive designs, aimed at web developers and designers maintaining interactive images.

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1,472+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Image Map Resizer JS processes input data instantly inside your browser.

Sample Input Birth date: Jan 15, 1995, Target date: Oct 20, 2023

Computed Result Chronological Age: 28 Years, 9 Months, 5 Days (10,505 days elapsed)

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool provides a practical method to recalculate image map coordinates when images resize in responsive layouts.
Conceptually, it determines a scale factor based on original and current widths, applying it to every coordinate; for example, a width drop from 800 px to 600 px scales x coordinates by 0.75.
Audience and value: web developers, designers, and content teams benefit from automated, reliable coordinate updates that preserve hotspot accuracy across viewports. The tool supports multiple maps, batch processing, and easy integration into build scripts.
Core features include per-map coordinate recalculation, batch processing, error reporting, and optional presets to apply common scaling rules.

Save your calculation history with a free account

How to Use

Provide inputs: original_width_px, current_width_px, and maps with coords.
Initialize or call the resizing function to compute new coordinates.
Review updated coords produced for each map.
Replace HTML map coordinates with the new values.
Validate hotspot alignment across breakpoints or viewport sizes.

Frequently Asked Questions

Find Quick Answers

What inputs are required to begin resizing?

You need the original image width in pixels, the current displayed width, and the map definitions with their coordinate data. The tool can handle multiple maps in a single run and will return updated coordinates for each map.

How are coordinates recalculated?

Coordinates are scaled by the factor current_width / original_width. Each x and y value is multiplied by this factor and rounded to the nearest integer. Width and height of rectangular areas follow the same scaling rule.

Can it process multiple maps at once?

Yes. The tool processes all provided maps in a batch, returning a coherent set of updated coordinates for each map. This supports complex images with several hotspots.

Is this suitable for dynamic resizing?

Yes. The approach is designed for resize events and build-time workflows. It recalculates coordinates to keep hotspots aligned as images scale across devices, without resizing the image itself.

What are the limitations?

The method relies on a baseline original width. For non-uniform or nonlinear scaling, additional manual adjustments may be required. It does not resize non-map assets or alter image content beyond coordinate recalculation.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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