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If you want to learn how to bolden lines in Excel, we’ll show you how to add bold border lines, darken the gridlines, and increase the weight of a drawn line. Make Borders Bold in Excel When you add borders in Excel, you can change the border style to a thicker weight which allows you to bold the lines easily. You can also change the color and place the borders outside, inside, or on certain edges of a cell. Select the cells where you want to place the bold border lines or the existing cells where you already have a border. Go to the Home tab and open the Border drop-down menu in the Font section of the ribbon. Choose More Borders . In the Format Cells dialog box, confirm you’re on the Border tab. Pick a line Style on the top left. You’ll notice a couple of thicker lines on the right side of the style box. Optionally, change the line Color using that drop-down box beneath. On the right side, use the Presets at the top or choose the individual border buttons to a...