Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

/* Keyword values for scalable size */ size: auto; size: portrait; size: landscape;  /* <length> values */ /* 1 value: height = width */ size: 6in;  /* 2 values: width then height */ size: 4in 6in;  /* Keyword values for absolute size */ size: A4; size: B5; size: JIS-B4; size: letter;  /* Mixing size and orientation */ size: A4 portrait; 

size

Experimental: This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The size CSS at-rule descriptor, used with the @page at-rule, defines the size and orientation of the box which is used to represent a page. Most of the time, this size corresponds to the target size of the printed page if applicable.

Size may either be defined with a "scalable" keyword (in this case the page will fill the available dimensions) or with absolute dimensions.

Syntax

/* Keyword values for scalable size */ size: auto; size: portrait; size: landscape;  /* <length> values */ /* 1 value: height = width */ size: 6in;  /* 2 values: width then height */ size: 4in 6in;  /* Keyword values for absolute size */ size: A4; size: B5; size: JIS-B4; size: letter;  /* Mixing size and orientation */ size: A4 portrait; 

Values

auto

The user agent decides the size of the page. In most cases, the dimensions and orientation of the target sheet are used.

landscape

The content of the page is displayed in landscape mode (i.e. the longest side of the box is horizontal).

portrait

The content of the page is displayed in portrait mode (i.e. the longest side of the box is vertical). This is the default orientation.

<length>

Any length value (see <length>). The first value corresponds to the width of the page box and the second one corresponds to its height. If only one value is provided, it is used for both width and height.

<page-size>

A keyword which may be any of the following values:

A5

This matches the standard, ISO dimensions: 148mm x 210mm.

A4

This matches the standard, ISO dimensions: 210mm x 297mm. (most frequently used dimensions for personal printing.)

A3

This matches the standard, ISO dimensions: 297mm x 420mm.

B5

This matches the standard, ISO dimensions: 176mm x 250mm.

B4

This matches the standard, ISO dimensions: 250mm x 353mm.

JIS-B5

This correspond to the JIS standard dimensions: 182mm x 257mm.

JIS-B4

This correspond to the JIS standard dimensions: 257mm x 364mm.

letter

This keyword is a equivalent to the dimensions of letter paper in North America i.e. 8.5in x 11in.

legal

This keyword is a equivalent to the dimensions of legal papers in North America i.e. 8.5in x 14in.

ledger

This keyword is a equivalent to the dimensions of ledger pages in North America i.e. 11in x 17in.

Formal definition

Related at-rule	@page
Initial value	auto
Computed value	as specified, but with relative lengths converted into absolute lengths

Formal syntax

<length>{1,2} | auto | [ <page-size> || [ portrait | landscape ] ]
where <page-size> = A5 | A4 | A3 | B5 | B4 | JIS-B5 | JIS-B4 | letter | legal | ledger

Examples

Specifying size and orientation

@page {   size: 4in 6in landscape; } 

Nesting inside a @media rule

@media print {   @page {     size: 50mm 150mm;   } } 

Specifications

Specification
Proposals for the future of CSS Paged Media # page-size-prop

Last modified: Aug 12, 2021, by MDN contributors