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Aspect Ratio Calculator

Calculate aspect ratios (16:9, 4:3, etc.) and new size for resizing images. Tool for designers and photographers. Free online. Fast, free, and private.

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Select files or drag & drop here

Processed 100% locally in your browser. Your files never touch an external server.

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100% Client-Side Privacy•No File Size Limits•Free Forever

About Aspect Ratio Calculator

FusioFiles 100% Client-Side Privacy Guarantee

Your files and data never leave your browser — processed directly on your device.

Zero Server UploadsExecution occurs entirely in browser memory via WebAssembly and HTML5 Canvas.

HIPAA & GDPR ReadySafe for confidential tax forms, medical records, financial sheets, and legal contracts.

Zero Cloud LatencyInstant results with no upload delays, server queues, or third-party tracking.

Automatic RAM PurgeBuffers and caches are automatically wiped clean the instant you close the tab.

Enter Values

Input either width, height, or the ratio itself.

Calculate

The missing dimension is solved instantly to keep proportions.

Precision Resize

Use the result to export images with perfect cropping.

A handy utility for designers, developers, and photographers to calculate image size while maintaining the correct aspect ratio.

Key Features

Calculate Dimensions

Find the missing width or height fast.

Identity Ratio

Determine the exact aspect ratio of any image.

Standard Presets

Quickly select common ratios like 16:9, 4:3, or 1:1.

Fast & Simple

Instant calculations with no ads or clutter.

Frequently Asked Questions

It is the proportional relationship between the width and height of an image (Width:Height).

Yes, completely free. No account, subscription, or hidden fees — ever.

Yes. All processing runs directly in your browser — nothing is ever uploaded to a server.

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Last updated on March 22, 2026