Justified type presents a mass of text with unified, crisp edges formed by characters that fill the width of each line. Adobe Photoshop treats text alignment as a paragraph attribute and separates justification from other alignment options, including flush left, flush right and centered. If you set your type as single-line point text instead of multi-line paragraph text, Photoshop disables its four justification modes. To apply this type alignment in a Photoshop document, start with the typesetting options that create paragraph type.
Press "T" to switch to the Adobe Photoshop Type tool. To set the dimensions of the bounding box that contains a piece of paragraph text, hold down the "Alt" key and click on the live area of your document. The Paragraph Text Size dialog box appears so you can set the width and height. To draw the bounding box instead of specifying its measurements, click and drag with the Type tool.
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Type or paste your text into the bounding box. Press "Ctrl-A" to select all the text. Open the "Window" menu and choose "Character" to reveal the Character panel if it isn't already visible. Assign basic text attributes including typeface, style, size and color. You also can apply some of these attributes in the Control panel.
Open the "Window" menu and choose "Paragraph" to reveal the Paragraph panel. Type alignment forms a paragraph attribute in Adobe Photoshop, with four clickable justification-mode buttons that change the alignment of your paragraph text. The four modes differ only in the alignment of the last line of a paragraph. Justify Last Left matches the appearance of conventional justification, with the last line of a paragraph set flush left. Justify Last Centered and Justify Last Right align the last line in the middle of the width of the paragraph or set it flush right, respectively. Justify All applies force justification that spaces out all lines of text in a paragraph.