diff --git a/app/javascript/mastodon/components/media_gallery.js b/app/javascript/mastodon/components/media_gallery.js
index 78a2f5dc476..d84e4229c91 100644
--- a/app/javascript/mastodon/components/media_gallery.js
+++ b/app/javascript/mastodon/components/media_gallery.js
@@ -4,6 +4,8 @@ import PropTypes from 'prop-types';
 import IconButton from './icon_button';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { isIOS } from '../is_mobile';
+import classNames from 'classnames';
+import sizeMe from 'react-sizeme';
 
 const messages = defineMessages({
   toggle_visible: { id: 'media_gallery.toggle_visible', defaultMessage: 'Toggle visibility' },
@@ -17,6 +19,7 @@ class Item extends React.PureComponent {
 
   static propTypes = {
     attachment: ImmutablePropTypes.map.isRequired,
+    standalone: PropTypes.bool,
     index: PropTypes.number.isRequired,
     size: PropTypes.number.isRequired,
     onClick: PropTypes.func.isRequired,
@@ -25,6 +28,9 @@ class Item extends React.PureComponent {
 
   static defaultProps = {
     autoPlayGif: false,
+    standalone: false,
+    index: 0,
+    size: 1,
   };
 
   handleMouseEnter = (e) => {
@@ -57,7 +63,7 @@ class Item extends React.PureComponent {
   }
 
   render () {
-    const { attachment, index, size } = this.props;
+    const { attachment, index, size, standalone } = this.props;
 
     let width  = 50;
     let height = 100;
@@ -136,7 +142,7 @@ class Item extends React.PureComponent {
       const autoPlay = !isIOS() && this.props.autoPlayGif;
 
       thumbnail = (
-        <div className={`media-gallery__gifv ${autoPlay ? 'autoplay' : ''}`}>
+        <div className={classNames('media-gallery__gifv', { autoplay: autoPlay })}>
           <video
             className='media-gallery__item-gifv-thumbnail'
             role='application'
@@ -154,8 +160,10 @@ class Item extends React.PureComponent {
       );
     }
 
+    const style = standalone ? {} : { left, top, right, bottom, width: `${width}%`, height: `${height}%` };
+
     return (
-      <div className='media-gallery__item' key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
+      <div className={classNames('media-gallery__item', { standalone })} key={attachment.get('id')} style={style}>
         {thumbnail}
       </div>
     );
@@ -164,11 +172,14 @@ class Item extends React.PureComponent {
 }
 
 @injectIntl
+@sizeMe({})
 export default class MediaGallery extends React.PureComponent {
 
   static propTypes = {
     sensitive: PropTypes.bool,
+    standalone: PropTypes.bool,
     media: ImmutablePropTypes.list.isRequired,
+    size: PropTypes.object,
     height: PropTypes.number.isRequired,
     onOpenMedia: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
@@ -177,6 +188,7 @@ export default class MediaGallery extends React.PureComponent {
 
   static defaultProps = {
     autoPlayGif: false,
+    standalone: false,
   };
 
   state = {
@@ -198,10 +210,19 @@ export default class MediaGallery extends React.PureComponent {
   }
 
   render () {
-    const { media, intl, sensitive } = this.props;
+    const { media, intl, sensitive, height, standalone, size } = this.props;
 
     let children;
 
+    const standaloneEligible = standalone && size.width && media.size === 1 && media.getIn([0, 'meta', 'small', 'aspect']);
+    const style = {};
+
+    if (standaloneEligible) {
+      style.height = size.width / media.getIn([0, 'meta', 'small', 'aspect']);
+    } else {
+      style.height = height;
+    }
+
     if (!this.state.visible) {
       let warning;
 
@@ -212,19 +233,24 @@ export default class MediaGallery extends React.PureComponent {
       }
 
       children = (
-        <button className='media-spoiler' onClick={this.handleOpen}>
+        <button className='media-spoiler' onClick={this.handleOpen} style={style}>
           <span className='media-spoiler__warning'>{warning}</span>
           <span className='media-spoiler__trigger'><FormattedMessage id='status.sensitive_toggle' defaultMessage='Click to view' /></span>
         </button>
       );
     } else {
       const size = media.take(4).size;
-      children = media.take(4).map((attachment, i) => <Item key={attachment.get('id')} onClick={this.handleClick} attachment={attachment} autoPlayGif={this.props.autoPlayGif} index={i} size={size} />);
+
+      if (standaloneEligible) {
+        children = <Item standalone onClick={this.handleClick} attachment={media.get(0)} autoPlayGif={this.props.autoPlayGif} />;
+      } else {
+        children = media.take(4).map((attachment, i) => <Item key={attachment.get('id')} onClick={this.handleClick} attachment={attachment} autoPlayGif={this.props.autoPlayGif} index={i} size={size} />);
+      }
     }
 
     return (
-      <div className='media-gallery' style={{ height: `${this.props.height}px` }}>
-        <div className={`spoiler-button ${this.state.visible ? 'spoiler-button--visible' : ''}`}>
+      <div className='media-gallery' style={style}>
+        <div className={classNames('spoiler-button', { 'spoiler-button--visible': this.state.visible })}>
           <IconButton title={intl.formatMessage(messages.toggle_visible)} icon={this.state.visible ? 'eye' : 'eye-slash'} overlay onClick={this.handleOpen} />
         </div>
 
diff --git a/app/javascript/mastodon/features/status/components/detailed_status.js b/app/javascript/mastodon/features/status/components/detailed_status.js
index b11b4178055..87fe0189798 100644
--- a/app/javascript/mastodon/features/status/components/detailed_status.js
+++ b/app/javascript/mastodon/features/status/components/detailed_status.js
@@ -61,7 +61,16 @@ export default class DetailedStatus extends ImmutablePureComponent {
           />
         );
       } else {
-        media = <MediaGallery sensitive={status.get('sensitive')} media={status.get('media_attachments')} height={300} onOpenMedia={this.props.onOpenMedia} autoPlayGif={this.props.autoPlayGif} />;
+        media = (
+          <MediaGallery
+            standalone
+            sensitive={status.get('sensitive')}
+            media={status.get('media_attachments')}
+            height={300}
+            onOpenMedia={this.props.onOpenMedia}
+            autoPlayGif={this.props.autoPlayGif}
+          />
+        );
       }
     } else if (status.get('spoiler_text').length === 0) {
       media = <CardContainer statusId={status.get('id')} />;
diff --git a/app/javascript/styles/components.scss b/app/javascript/styles/components.scss
index b6cf920b4f2..da479347b58 100644
--- a/app/javascript/styles/components.scss
+++ b/app/javascript/styles/components.scss
@@ -3645,6 +3645,12 @@ button.icon-button.active i.fa-retweet {
   display: block;
   float: left;
   position: relative;
+
+  &.standalone {
+    .media-gallery__item-gifv-thumbnail {
+      transform: none;
+    }
+  }
 }
 
 .media-gallery__item-thumbnail {
@@ -3652,6 +3658,7 @@ button.icon-button.active i.fa-retweet {
   display: block;
   text-decoration: none;
   height: 100%;
+  line-height: 0;
 
   &,
   img {
diff --git a/app/views/stream_entries/_detailed_status.html.haml b/app/views/stream_entries/_detailed_status.html.haml
index 26e41a10d04..fa9ccd1f084 100644
--- a/app/views/stream_entries/_detailed_status.html.haml
+++ b/app/views/stream_entries/_detailed_status.html.haml
@@ -24,7 +24,7 @@
       - video = status.media_attachments.first
       %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive?, width: 670, height: 380) }}
     - else
-      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, sensitive: status.sensitive?, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
+      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, sensitive: status.sensitive?, standalone: true, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
   - elsif status.preview_cards.first
     %div{ data: { component: 'Card', props: Oj.dump('maxDescription': 160, card: ActiveModelSerializers::SerializableResource.new(status.preview_cards.first, serializer: REST::PreviewCardSerializer).as_json) }}
 
diff --git a/package.json b/package.json
index be9b908754f..7835a044086 100644
--- a/package.json
+++ b/package.json
@@ -95,6 +95,7 @@
     "react-router-dom": "^4.1.1",
     "react-router-scroll": "ytase/react-router-scroll#build",
     "react-simple-dropdown": "^3.0.0",
+    "react-sizeme": "^2.3.5",
     "react-swipeable-views": "^0.12.3",
     "react-textarea-autosize": "^5.0.7",
     "react-toggle": "^4.0.1",
diff --git a/yarn.lock b/yarn.lock
index 7b832880576..640d06a102e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -982,6 +982,10 @@ base64-js@^1.0.2:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.2.1.tgz#a91947da1f4a516ea38e5b4ec0ec3773675e0886"
 
+batch-processor@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/batch-processor/-/batch-processor-1.0.0.tgz#75c95c32b748e0850d10c2b168f6bdbe9891ace8"
+
 batch@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/batch/-/batch-0.6.1.tgz#dc34314f4e679318093fc760272525f94bf25c16"
@@ -2053,6 +2057,12 @@ electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.14:
   version "1.3.15"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.15.tgz#08397934891cbcfaebbd18b82a95b5a481138369"
 
+element-resize-detector@^1.1.12:
+  version "1.1.12"
+  resolved "https://registry.yarnpkg.com/element-resize-detector/-/element-resize-detector-1.1.12.tgz#8b3fd6eedda17f9c00b360a0ea2df9927ae80ba2"
+  dependencies:
+    batch-processor "^1.0.0"
+
 elliptic@^6.0.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.4.0.tgz#cac9af8762c85836187003c8dfe193e5e2eae5df"
@@ -5413,6 +5423,14 @@ react-simple-dropdown@^3.0.0:
     classnames "^2.1.2"
     prop-types "^15.5.8"
 
+react-sizeme@^2.3.5:
+  version "2.3.5"
+  resolved "https://registry.yarnpkg.com/react-sizeme/-/react-sizeme-2.3.5.tgz#f14c0a15f9b24d7b8b6f196871b0af19aa01a422"
+  dependencies:
+    element-resize-detector "^1.1.12"
+    invariant "^2.2.2"
+    lodash "^4.17.4"
+
 react-swipeable-views-core@^0.11.1:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/react-swipeable-views-core/-/react-swipeable-views-core-0.11.1.tgz#61d046799f90725bbf91a0eb3abcab805c774cac"