Free browser tools

Aspect ratio, image and video tools

Calculate dimensions, convert formats, measure crop loss and plan social media assets. Every tool works in your browser and requires no account.

Choose a task

Start with the result you need.

Find the simplified ratio, decimal value and matching dimensions from a width and height.

Convert a source size to a new width, height or ratio while preserving proportions.

See the exact crop dimensions, removed pixels and percentage of an image or video that will be lost.

Calculate scaled content, black bar thickness and active frame area for any output size.

Check the ratio and dimensions of an image locally without uploading the file.

Plan video dimensions for landscape, portrait, square and cinematic formats.

Look up and calculate dimensions for common social posts, stories, shorts and videos.

Use a focused collection when you are working on one type of asset.

Calculate, convert and compare crop results.

Check image files and prepare image dimensions.

Plan frames for horizontal and vertical video.

Choose formats for posts, stories and short-form video.

If you know the width and height and want the ratio, use the aspect ratio calculator. If you know one target dimension, use the converter. If a platform requires a different shape, compare the crop loss with a no-crop letterbox or pillarbox fit.

Browse the ratio guides for examples such as 16:9, 9:16, 1:1 and 4:5.