How do you make an image a4 size in photoshop

In the Image Size dialogue box make sure the Constrain Proportions Option is checked. The first step is to make sure that the Resample box is unchecked. So that's how to resize an image for on-screen use in Photoshop's CC Image Size dialog box.
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Stay up-to-date with techniques and tricks by taking convenient photography courses online. Duplicating the layer allows you to easily go back to the original image if something goes wrong with the duplicate. I think that the size on photoshop is too big.