Use "Swap" to quickly toggle between landscape and portrait orientations?

Use "Swap" to quickly toggle between landscape and portrait orientations.

The CSS snippet copies a ready-to-paste aspect-ratio property for your stylesheets?

The CSS snippet copies a ready-to-paste aspect-ratio property for your stylesheets.

Social media presets give you the exact pixel dimensions each platform recommends.

Calculate and convert aspect ratios

Calculate and convert aspect ratios for images, videos, and screens. All calculations run instantly in your browser.

1Enter a width and height to see the corresponding aspect ratio.
2Click "Lock ratio" to constrain proportions — change one dimension and the other auto-adjusts.
3Browse common ratios (16:9, 4:3, 1:1, 21:9) or platform presets (Instagram, YouTube, X/Twitter).
4Use device presets to check dimensions for popular phones, tablets, and monitors.
5Click "Copy dimensions" or "Copy ratio" to paste values into your design tool.

Use "Swap" to quickly toggle between landscape and portrait orientations.
The CSS snippet copies a ready-to-paste aspect-ratio property for your stylesheets.
Social media presets give you the exact pixel dimensions each platform recommends.

Free: all ratios and presets. Starter+: CSS snippet export, device presets.

OneKitTools TeamUpdated 2.21.4