497x373 pixels are ideal image dimensions on Google+

You already know it's smart to upload an image with your posts, and naturally you want this image to look its best.

Make your image 497x373 px and Google+ will not resize it nor will your image get ugly black sidebars.

I always upload images in PNG format, unless the image is too big (more than 500 KB). Then I save the image as JPG.

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