diff --git a/client/css/style.css b/client/css/style.css
index 3ba3d46f..f2f3555c 100644
--- a/client/css/style.css
+++ b/client/css/style.css
@@ -137,12 +137,14 @@ kbd {
 	text-transform: uppercase;
 	transition: background .2s, border-color .2s, color .2s;
 	word-spacing: 3px;
+	cursor: pointer; /* This is useful for `<button>` elements */
 }
 
 .btn:disabled,
 .btn:hover {
 	background: #84ce88;
 	color: #fff;
+	opacity: 1;
 }
 
 .btn:active {
@@ -335,6 +337,9 @@ kbd {
 #wrap {
 	height: 100%;
 	overflow: hidden;
+
+	/* Needed to transition blurred background when image viewer is open */
+	transition: filter .2s;
 }
 
 #viewport {
@@ -1145,7 +1150,6 @@ kbd {
 	color: #222;
 	font-size: 12px;
 	max-width: 100%;
-	padding: 6px;
 	margin: 2px 0;
 	overflow: hidden;
 }
@@ -1157,22 +1161,32 @@ kbd {
 }
 
 #chat .toggle-content .thumb {
-	margin-right: 6px;
 	max-width: 48px;
 	max-height: 32px;
 }
 
+#chat .toggle-thumbnail {
+	padding: 6px;
+}
+
 #chat .toggle-text {
+	padding: 6px;
 	min-width: 0;
 	display: flex;
 	flex-direction: column;
 	white-space: nowrap;
+	color: inherit;
+}
+
+#chat .toggle-text:not(:first-child) {
+	padding-left: 0;
 }
 
 #chat .toggle-content .head,
 #chat .toggle-content .body {
 	text-overflow: ellipsis;
 	overflow: hidden;
+	color: inherit;
 }
 
 #chat .toggle-content .head {
@@ -1996,3 +2010,72 @@ kbd {
 ::-webkit-scrollbar-thumb:vertical:active {
 	background: rgba(0, 0, 0, .6);
 }
+
+/* Image viewer */
+
+#image-viewer,
+#image-viewer .close-btn {
+	/* Vertically and horizontally center stuff */
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+	justify-content: center;
+}
+
+#image-viewer {
+	position: fixed;
+	top: 0;
+	bottom: 0;
+	left: 0;
+	right: 0;
+	background: rgba(0, 0, 0, .8);
+	visibility: hidden;
+	opacity: 0;
+	transition: opacity .2s, visibility .2s;
+	z-index: 999;
+}
+
+.image-viewer-opened #wrap {
+	filter: blur(4px);
+}
+
+.image-viewer-opened #image-viewer {
+	visibility: visible;
+	opacity: 1;
+}
+
+#image-viewer .close-btn {
+	position: fixed;
+	top: 0;
+	right: 0;
+	width: 2em;
+	height: 2em;
+	font-size: 36px;
+	color: white;
+	z-index: 1001;
+	opacity: .6;
+	transition: .2s opacity;
+}
+
+#image-viewer .close-btn:hover {
+	opacity: 1;
+}
+
+#image-viewer .image-link {
+	margin: 10px;
+}
+
+#image-viewer .image-link:hover {
+	opacity: 1;
+}
+
+#image-viewer .image-link img {
+	max-width: 100%;
+
+	/* Top/Bottom margins + button height + image/button margin */
+	max-height: calc(100vh - 2 * 10px - 37px - 10px);
+}
+
+#image-viewer .open-btn {
+	margin: 0 auto 10px;
+}
diff --git a/client/index.html b/client/index.html
index 398995a5..4a32be51 100644
--- a/client/index.html
+++ b/client/index.html
@@ -901,6 +901,8 @@
 		<ul id="context-menu"></ul>
 	</div>
 
+	<div id="image-viewer"></div>
+
 	<script src="js/bundle.vendor.js"></script>
 	<script src="js/bundle.js"></script>
 
diff --git a/client/js/renderPreview.js b/client/js/renderPreview.js
index 86fb58c0..c6f6d21d 100644
--- a/client/js/renderPreview.js
+++ b/client/js/renderPreview.js
@@ -61,3 +61,47 @@ function handleImageInPreview(content, container) {
 		});
 	}
 }
+
+/* Image viewer */
+
+// FIXME Remove #input focus when this is open
+// See https://github.com/thelounge/lounge/issues/1342
+$("#viewport").on("click", ".toggle-thumbnail", function() {
+	const link = $(this);
+
+	openImageViewer(link);
+
+	// Prevent the link to open a new page since we're opening the image viewer,
+	// but keep it a link to allow for Ctrl/Cmd+click
+	return false;
+});
+
+$("#image-viewer").on("click", function() {
+	closeImageViewer();
+});
+
+$(document).keydown(function(e) {
+	switch (e.keyCode ? e.keyCode : e.which) {
+	case 27: // Escape
+		closeImageViewer();
+		break;
+	}
+});
+
+function openImageViewer(link) {
+	$("#image-viewer").html(templates.image_viewer({
+		image: link.find("img").attr("src"),
+		link: link.attr("href"),
+		type: link.parent().hasClass("toggle-type-image") ? "image" : "link"
+	}));
+
+	$(document.body).addClass("image-viewer-opened");
+}
+
+function closeImageViewer() {
+	$(document.body)
+		.removeClass("image-viewer-opened")
+		.one("transitionend", function() {
+			$("#image-viewer").empty();
+		});
+}
diff --git a/client/views/image_viewer.tpl b/client/views/image_viewer.tpl
new file mode 100644
index 00000000..5cdc3a50
--- /dev/null
+++ b/client/views/image_viewer.tpl
@@ -0,0 +1,13 @@
+<button class="close-btn" aria-label="Close">×</button>
+
+<a class="image-link" href="{{link}}" target="_blank">
+  <img src="{{image}}">
+</a>
+
+<a class="btn open-btn" href="{{link}}" target="_blank">
+  {{#equal type "image"}}
+    Open image
+  {{else}}
+    Visit page
+  {{/equal}}
+</a>
diff --git a/client/views/index.js b/client/views/index.js
index ca571bec..5c9da5dd 100644
--- a/client/views/index.js
+++ b/client/views/index.js
@@ -29,6 +29,7 @@ module.exports = {
 	msg_preview_toggle: require("./msg_preview_toggle.tpl"),
 	msg_unhandled: require("./msg_unhandled.tpl"),
 	network: require("./network.tpl"),
+	image_viewer: require("./image_viewer.tpl"),
 	unread_marker: require("./unread_marker.tpl"),
 	user: require("./user.tpl"),
 	user_filtered: require("./user_filtered.tpl"),
diff --git a/client/views/msg_preview.tpl b/client/views/msg_preview.tpl
index 5f56529c..24f4a599 100644
--- a/client/views/msg_preview.tpl
+++ b/client/views/msg_preview.tpl
@@ -1,15 +1,19 @@
 {{#preview}}
-<a href="{{link}}" target="_blank" rel="noopener" class="toggle-content toggle-type-{{type}}{{#if shown}} show{{/if}}">
+<div class="toggle-content toggle-type-{{type}}{{#if shown}} show{{/if}}">
 	{{#equal type "image"}}
-		<img src="{{link}}">
+		<a class="toggle-thumbnail" href="{{link}}" target="_blank" rel="noopener">
+			<img src="{{link}}">
+		</a>
 	{{else}}
 		{{#if thumb}}
-			<img src="{{thumb}}" class="thumb">
+			<a class="toggle-thumbnail" href="{{link}}" target="_blank" rel="noopener">
+				<img src="{{thumb}}" class="thumb">
+			</a>
 		{{/if}}
-		<div class="toggle-text">
+		<a class="toggle-text" href="{{link}}" target="_blank" rel="noopener">
 			<div class="head" title="{{head}}">{{head}}</div>
 			<div class="body" title="{{body}}">{{body}}</div>
-		</div>
+		</a>
 	{{/equal}}
-</a>
+</div>
 {{/preview}}