Pages for Mac: Set paper size and margins
Most Pages templates are created for standard paper sizes in portrait (vertical) orientation. You can change these settings to create documents in landscape (horizontal) orientation and with different dimensions.
Use the controls in the Document tab of the sidebar on the right to set top, bottom, left, and right margins for a document. Use the controls on the ruler to set margins for specific paragraphs.

Set page orientation
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Click the Document tab at the top of the sidebar on the right
If you don’t see a sidebar, or the sidebar doesn’t have a Document tab, click
in the toolbar. -
Click one of the page orientations (portrait or landscape).
You can only use one page orientation for your document. Pages doesn’t support a mix of portrait and landscape in the same document.
You can change the orientation for a document at any time; you may need to make adjustments so that the document looks the way you want in the new orientation.
Set a default printer and standard paper size
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Click the Document tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Document tab, click
in the toolbar. -
Click the printer pop-up menu, then choose a default printer for the document (you can change the default printer at any time).
Printing options are printer-specific. For example, if the printer you set doesn’t do two-sided printing, you won’t see that option in the print settings when you’re ready to print.
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Click the paper size pop-up menu, then choose a paper size.
Set a custom paper size
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Choose File > Page Setup (from the File menu at the top of the screen).
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Click the Paper Size pop-up menu, then choose Manage Custom Sizes.
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Click + to add your custom size.
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Click Untitled in the list above (it’s added when you click +), then type a name for your custom size.
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Type the width and height of the paper in the Width and Height fields.
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Make print margin settings, then click Ok.
If you need more information about custom print options, click the question mark button at the bottom of the print settings.
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Click OK to close the Page Setup window.
In the document sidebar of Pages, your custom page appears as Other. You can check File > Page Setup to see which custom setting is selected.
Set document margins
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Click the Document tab at the top of the sidebar on the right.
If you don’t see a sidebar, or the sidebar doesn’t have a Document tab, click
in the toolbar. -
In the Document Margins section, click the arrows or enter values in the fields next to Top, Bottom, Left, and Right.
Change paragraph margins
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Select one or more paragraphs, or press Command-A to select all paragraphs in the document.
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Do any of the following:
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In the ruler, drag the margin marker (the blue triangle) to where you want it.

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Click the Style button near the top of the sidebar, then click one of the default indent buttons in the Alignment section to increase or decrease the indent of an entire paragraph.

If you don’t see a sidebar, or the sidebar doesn’t have a Layout button, click
in the toolbar. If the text is in a text box, table, or shape, first click the Text tab at the top of the sidebar, then click the Layout button.
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Indent the first line in a paragraph
You can indent the first line of text in a paragraph to create a visual break in the document that helps readers scan paragraphs.
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Select one or more paragraphs, or press Command-A to select all paragraphs in the document.
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Do any of the following:
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In the ruler, drag the first line indent marker (the blue rectangle) to where you want it.

The first line indent rectangle may be directly above the left margin triangle. If you can’t select just one of the markers, use the controls in the sidebar to set the margin and indent (see the option below).
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Click the Layout button near the top of the sidebar on the right, click the disclosure triangle next to Indents, then click the arrows next to First.
If you don’t see a sidebar, or the sidebar doesn’t have a Layout button, click
in the toolbar. If the selected paragraphs are in a text box, table, or shape, first click the Text tab at the top of the sidebar, then click the Layout button. 
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You can set the ruler to use points, inches, or centimeters; to show the tick marks as percentages; and to place zero at the center of the ruler. To specify these settings, click Pages > Preferences (in the Pages menu at the top of your screen).
For more information about using rulers, see Use rulers.