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The max-zoom CSS descriptor sets the maximum zoom factor of a document defined by the @viewport at-rule. The browser will not zoom in any further than this, whether automatically or at the user's request.

A zoom factor of 1.0 or 100% corresponds to no zooming. Larger values zoom in. Smaller values zoom out.

Related at-rule@viewport
Initial valueauto
Percentagesthe zoom factor itself
Mediavisual, continuous
Computed valueauto, or a non-negative number or percentage as specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* Keyword value */
max-zoom: auto;

/* <number> values */
max-zoom: 0.8;
max-zoom: 2.0;

/* <percentage> value */
max-zoom: 150%;


The user agent will set the document's upper zoom factor limit.
A non-negative number limiting the maximum value of the zoom factor.
A non-negative percentage limiting the maximum value of the zoom factor.

Formal syntax

auto | <number> | <percentage>


Specification Status Comment
CSS Device Adaptation
The definition of '"max-zoom" descriptor' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? ? ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? ?

Document Tags and Contributors

 Contributors to this page: Sebastianz, mrenty, LouisLazaris, fscholz, cvrebert
 Last updated by: Sebastianz,