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Exporting for screens? Ensure that your artboards are aligned to the pixel grid.
When exporting an artboard using File > Export > Export for Screens, if the artboards are not aligned to pixel grid, the artboard size increases by one extra pixel.
To pixel-align artboards, alternatively you can manually change the X and Y values of the artboard in Properties panel.
For example, consider the artboard of size 600 x 200 and placed at X: 298.28pt and Y: 207.31pt.
If you change the values to the nearest integer 298pt and 207pt, the extra pixel is removed and the artboard is correctly sized at 600 x 200 pt.