TOOLS FORVIDEO EDITORS

Framing / raster

Aspect ratio and resolution calculator

Check the shape of a raster and derive dimensions that preserve a chosen aspect ratio without stretching.

Runs locallyNo sign-inFree
Browser-local toolVC / ASP
Source raster
Matching target optional

Enter a raster to reduce its ratio and derive a matching size.

Production notes

What this result means

Reduce a raster to its exact aspect ratio and calculate a matching width or height for a target frame. Results are intended for planning and convenience; confirm critical values in your editing, encoding, or delivery system.

Useful for

  • Matching proxy and master dimensions
  • Planning social and broadcast versions
  • Checking whether a raster is truly 16:9

Assumptions

  • Pixel aspect ratio is square (1:1).
  • Calculated target dimensions are rounded to the nearest whole pixel.
  • The reduced ratio is mathematical and may differ slightly from a familiar display label.

Limits & checks

  • Anamorphic pixel aspect ratios and clean aperture metadata are not included.
  • Some codecs require even or macroblock-aligned dimensions.
  • A matching ratio does not guarantee compliance with a delivery specification.

FAQ

Before the final export

Is 1920×1080 exactly 16:9?

Yes. Both dimensions reduce to 16:9.

Why can a cinema resolution have a nearby but different ratio?

Digital cinema rasters and the active picture inside them can use different framing.

Should dimensions be even?

Many chroma-subsampled codecs require even dimensions, so verify the encoder specification.

Next in the workflow

Related tools

01Crop & letterboxCalculate fit, fill, crop, and letterbox geometry between a source raster and target canvas.02Metadata inspectorInspect browser-readable video duration, raster, aspect ratio, file size, type, and estimated average data rate without uploading the file.03Image sequenceCalculate inclusive image-sequence frame counts, duration, handle ranges, and detect missing frames from a pasted frame list.