Turn a width × height (e.g. 1920×1080) into its simplified aspect ratio (16:9), or expand a ratio into resolutions.
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Aspect Ratio Converter
Design • ratio
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How to Use the Aspect Ratio Converter
Pick a direction — use the toggle at the top (e.g. encode vs decode).
Type or paste your text — the result updates live as you type; large inputs are fine.
Copy the result — one click copies the output to your clipboard.
Swap — flip the direction (⇄) to reverse the conversion instantly.
Why Use This Aspect Ratio Converter
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Accurate Standards
Built on internationally recognised SI and standards-body conversion factors for dependable results.
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Instant & Animated
Results update live as you type, with a clear visual breakdown across every unit at once.
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100% Private
Everything runs in your browser — no account, no uploads, nothing leaves your device.
Understanding the Aspect Ratio Converter
Aspect ratio is the proportional relationship between width and height — 1920×1080 simplifies to 16:9, the standard for HD/4K video and most monitors. Knowing the ratio matters for video editing, photography, web design and fitting content to screens without stretching or black bars.
Enter a resolution to get its simplified ratio, or enter a ratio to get matching resolutions. Instant and browser-based.
Aspect Ratio Converter FAQ
It simplifies to 16:9 (decimal 1.78:1), the standard widescreen ratio for HD/4K video and most monitors.