Bū tools
Resolution
Sizes, ratios and formats.
What it does
Work out the size of an image or a video: its width, its height and its shape (the ratio). The frame shows it to scale.
Change one dimension, keep the shape
With the chain closed (the link between Width and Height, like in Photoshop), type the width or the height: the other one follows, in orange with “auto”. Pick a ratio (16:9, 4:3…) to change the shape.
Find the ratio of a size
Open the chain, then type the width and the height: the ratio is shown in the frame.
Also
- ⟲ on the frame turns it: width and height swap, and all the ratios turn with it (16:9 becomes 9:16).
- ÷2 / ×2 halve or double the resolution, e.g. 1920 × 1080 → 3840 × 2160 (4K).
- The ⧉ buttons under the frame copy the width, the height or the ratio on its own.
- An odd width or height is flagged: many video codecs need even sizes. Tap to round it to the nearest even number.
- Formats: search a platform or a use (“tiktok”, “story”, “banner”, “scope”, “4k”…), or filter by group (Video, Cinema, Social, Photo, Print, Screens). By default, Same ratio shows the formats with the shape and orientation of the frame. Tap one to use it.
- An orange badge shows when your size is a standard format (Full HD, 4K UHD…).
Free, no account, nothing is sent: it runs in your browser, even offline.
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