diff --git a/pix/s/SMILEYS b/pix/s/SMILEYS
index 510b9ed04b4..f73deaaed80 100644
--- a/pix/s/SMILEYS
+++ b/pix/s/SMILEYS
@@ -1 +1,31 @@
-All these icon are 15x15 and saved using adaptive color tables
+Steps to update the smileys:
+
+1. From the emoji-data catalog, https://projects.iamcal.com/emoji-data/table.htm, choose the proper icon from img-google column:
+- s/smiley - :blush:
+- s/biggrin - :grin:
+- s/wink - :wink:
+- s/mixed - :confused:
+- s/thoughtful - :face_with_raised_eyebrow:
+- s/tongueout - :stuck_out_tongue_winking_eye:
+- s/cool - :sunglasses:
+- s/approve - :slightly_smiling_face:
+- s/wideeyes - :open_mouth:
+- s/clown - :clown_face:
+- s/sad - :white_frowning_face:
+- s/shy - :flushed:
+- s/blush - :face_with_hand_over_mouth:
+- s/kiss - :kissing_heart:
+- s/surprise - :astonished:
+- s/blackeye - :face_with_head_bandage:
+- s/angry - :rage:
+- s/dead - :skull_and_crossbones:
+- s/sleepy - :sleeping:
+- s/evil - :smiling_imp:
+- s/heart - :heart:
+- s/yes - :+1:
+- s/no - :-1:
+- s/egg - :egg:
+
+2. Download each of them into the pix/s folder.
+
+3. Crop the content (if required).
diff --git a/pix/s/angry.gif b/pix/s/angry.gif
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index b56fcbaf6e8..00000000000
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diff --git a/pix/s/angry.png b/pix/s/angry.png
new file mode 100644
index 00000000000..3ce6fa0f436
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diff --git a/pix/s/angry.svg b/pix/s/angry.svg
deleted file mode 100644
index 2beafa938f8..00000000000
--- a/pix/s/angry.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 239.75 240" width="16" height="16" preserveAspectRatio="xMinYMid meet"><defs><style>.cls-1,.cls-2,.cls-3,.cls-4{stroke:#000;stroke-miterlimit:10;}.cls-1{stroke-width:7px;fill:url(#Unbenannter_Verlauf_25);}.cls-2,.cls-3{fill:#fff;}.cls-2{stroke-width:13px;}.cls-3{stroke-width:15px;}</style><linearGradient id="Unbenannter_Verlauf_25" x1="37.54" y1="37.67" x2="202.21" y2="202.33" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#ffa9a9"/><stop offset="0.49" stop-color="#ff8787"/><stop offset="1" stop-color="#ff6767"/></linearGradient></defs><title>angry</title><g id="Ebene_3" data-name="Ebene 3"><ellipse class="cls-1" cx="119.88" cy="120" rx="116.38" ry="116.5"/><path class="cls-2" d="M166.5,189.5c-3-30-8.1-50.46-30.08-52.65-93.92-9.35-57,35-57,35,3,0,1.62-8.63,58,5C152.5,180.5,167.2,196.54,166.5,189.5Z" transform="translate(-0.25 -2)"/><ellipse class="cls-3" cx="87.67" cy="77.5" rx="33.92" ry="27.5"/><circle class="cls-4" cx="91.13" cy="91.46" r="8.25"/><ellipse class="cls-3" cx="157.67" cy="77.5" rx="33.92" ry="27.5"/><circle class="cls-4" cx="161.13" cy="91.46" r="8.25"/></g></svg>
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diff --git a/pix/s/approve.gif b/pix/s/approve.gif
deleted file mode 100644
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diff --git a/pix/s/approve.png b/pix/s/approve.png
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index 00000000000..2ab5e2701d7
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diff --git a/pix/s/approve.svg b/pix/s/approve.svg
deleted file mode 100644
index 10babba60bc..00000000000
--- a/pix/s/approve.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/biggrin.gif b/pix/s/biggrin.gif
deleted file mode 100644
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diff --git a/pix/s/biggrin.png b/pix/s/biggrin.png
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index 00000000000..eb3804f403f
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diff --git a/pix/s/biggrin.svg b/pix/s/biggrin.svg
deleted file mode 100644
index da3a9974ace..00000000000
--- a/pix/s/biggrin.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 239.75 240" width="16" height="16" preserveAspectRatio="xMinYMid meet"><defs><style>.cls-1,.cls-2,.cls-3{stroke:#000;stroke-miterlimit:10;}.cls-1{stroke-width:7px;fill:url(#Unbenannter_Verlauf_4);}.cls-2{fill:none;}.cls-2,.cls-3{stroke-width:13px;}.cls-3{fill:#fff;}</style><linearGradient id="Unbenannter_Verlauf_4" x1="37.54" y1="37.67" x2="202.21" y2="202.33" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#ffe600"/><stop offset="0.4" stop-color="#fde501"/><stop offset="0.54" stop-color="#f8e005" stop-opacity="0.99"/><stop offset="0.64" stop-color="#eed80b" stop-opacity="0.97"/><stop offset="0.73" stop-color="#e0cc15" stop-opacity="0.94"/><stop offset="0.8" stop-color="#cdbd21" stop-opacity="0.9"/><stop offset="0.86" stop-color="#b7aa30" stop-opacity="0.86"/><stop offset="0.92" stop-color="#9c9342" stop-opacity="0.81"/><stop offset="0.97" stop-color="#7e7a56" stop-opacity="0.75"/><stop offset="1" stop-color="#666" stop-opacity="0.7"/></linearGradient></defs><title>biggrin</title><g id="Ebene_3" data-name="Ebene 3"><ellipse class="cls-1" cx="119.88" cy="120" rx="116.38" ry="116.5"/><path class="cls-2" d="M55.5,79.5c.28-13.06,11-24.72,24-25s25,13,25,25" transform="translate(-0.25)"/><path class="cls-2" d="M184.5,79.5c-.28-13.06-10.95-24.72-24-25s-25,13-25,25" transform="translate(-0.25)"/><path class="cls-3" d="M39.5,102.5s-1,97,80,97c80,0,81-97,81-97-3,0-22,33-80,33C66.5,135.5,40.5,102.5,39.5,102.5Z" transform="translate(-0.25)"/></g></svg>
\ No newline at end of file
diff --git a/pix/s/blackeye.gif b/pix/s/blackeye.gif
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index b8f8a751a87..00000000000
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diff --git a/pix/s/blackeye.svg b/pix/s/blackeye.svg
deleted file mode 100644
index 4020d5b0777..00000000000
--- a/pix/s/blackeye.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/blush.gif b/pix/s/blush.gif
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diff --git a/pix/s/blush.svg b/pix/s/blush.svg
deleted file mode 100644
index 563dcb8d4a8..00000000000
--- a/pix/s/blush.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/clown.gif b/pix/s/clown.gif
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+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/cool.gif b/pix/s/cool.gif
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diff --git a/pix/s/cool.svg b/pix/s/cool.svg
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index d9f70ed3520..00000000000
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+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/pix/s/tongueout.gif b/pix/s/tongueout.gif
deleted file mode 100644
index c0f8c869028..00000000000
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diff --git a/pix/s/tongueout.png b/pix/s/tongueout.png
new file mode 100644
index 00000000000..749cff368b6
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diff --git a/pix/s/tongueout.svg b/pix/s/tongueout.svg
deleted file mode 100644
index 1b7887679db..00000000000
--- a/pix/s/tongueout.svg
+++ /dev/null
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\ No newline at end of file
diff --git a/pix/s/wideeyes.gif b/pix/s/wideeyes.gif
deleted file mode 100644
index 2f0df598f2f..00000000000
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diff --git a/pix/s/wideeyes.png b/pix/s/wideeyes.png
new file mode 100644
index 00000000000..0bb88b0d28d
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diff --git a/pix/s/wideeyes.svg b/pix/s/wideeyes.svg
deleted file mode 100644
index 99b921df125..00000000000
--- a/pix/s/wideeyes.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/wink.gif b/pix/s/wink.gif
deleted file mode 100644
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diff --git a/pix/s/wink.png b/pix/s/wink.png
new file mode 100644
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diff --git a/pix/s/wink.svg b/pix/s/wink.svg
deleted file mode 100644
index 544ef20605c..00000000000
--- a/pix/s/wink.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/pix/s/yes.gif b/pix/s/yes.gif
deleted file mode 100644
index 09f03a92d4a..00000000000
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diff --git a/pix/s/yes.png b/pix/s/yes.png
new file mode 100644
index 00000000000..3134e82e451
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diff --git a/pix/s/yes.svg b/pix/s/yes.svg
deleted file mode 100644
index 88cb4dd58a1..00000000000
--- a/pix/s/yes.svg
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/theme/boost/scss/moodle/icons.scss b/theme/boost/scss/moodle/icons.scss
index 99ce4279449..60ba18a5260 100644
--- a/theme/boost/scss/moodle/icons.scss
+++ b/theme/boost/scss/moodle/icons.scss
@@ -55,6 +55,11 @@ $iconsizes: map-merge((
         max-height: $icon-big-height;
         font-size: $icon-big-height;
     }
+
+    &.emoticon {
+        max-width: map-get($iconsizes, 3);
+        max-height: map-get($iconsizes, 3);
+    }
 }
 
 // Force size for the SVG icons.
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 7917d03660d..c9b174520cf 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -26208,6 +26208,10 @@ body.behat-site .action-menu .dropdown-subpanel-content.show {
   max-height: 64px;
   font-size: 64px;
 }
+.icon.emoticon {
+  max-width: 16px;
+  max-height: 16px;
+}
 
 img.icon {
   width: 16px;
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 91e46f1b941..27f96ad0817 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -26208,6 +26208,10 @@ body.behat-site .action-menu .dropdown-subpanel-content.show {
   max-height: 64px;
   font-size: 64px;
 }
+.icon.emoticon {
+  max-width: 16px;
+  max-height: 16px;
+}
 
 img.icon {
   width: 16px;