If your measurements in Zeplin look off (for example, they're showing up as half or twice the size compared to your design tool), this is most likely related to your project density setting.

Project density defines the resolution scale your team is designing at (e.g., 1x, 2x). Designers only need to set this once per project, and it ensures that measurements, specs, and assets are scaled appropriately for developers.

For example, if you're designing at 1x, a 20px element in Figma will be shown as 20px in Zeplin. But if you're designing at 2x, Zeplin will interpret that 20px as double-sized, and display it as 10px to match the 1x baseline used in code.

If you export your designs and see that the measurements are half/twice the size, this is probably related to your project density. For each project, the density only needs to be selected once by the designers, so that they can pick the “resolution of the design” that they are working on.

In most cases, your designs will be at 1x, and selecting that density in Zeplin will ensure measurements match what you see in your design tool.

However, if you're designing at a higher resolution (like 2x), you can set the project density in Zeplin to match. For example, if a layer is 20px in your design file, Zeplin will display it as 10px, making it easier for developers who are working with 1x values in code.
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If measurements in your project look incorrect: