PostMicroTools
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Aspect ratio + previewer
Work out the aspect ratio of a resolution, resize keeping proportion, and see how your footage fits into another format (letterbox/pillarbox) with safe areas.
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Common aspect ratios
16:9 is the TV and web standard; 2.39:1 (scope) and 1.85:1 (flat) are cinema formats; 9:16, 4:5 and 1:1 dominate social media. Moving footage between formats adds bars (letterbox/pillarbox) or crops, so it pays to frame with safe areas in mind.
What are safe areas?
Inner margins that guarantee action (action safe, ~90%) and text/graphics (title safe, ~80%) aren't lost to screen cropping or reframing. They come from the CRT era but remain useful for multi-format delivery.
Why 2.39 and not 2.40?
Modern scope is specified as 2.39:1 (formerly 2.35:1). It's often rounded to 2.40 in conversation, but the delivery value is 2.39:1.