diff --git a/docs/_includes/faq.html b/docs/_includes/faq.html
index 47a65dc1e5a5..7a96d941d9ef 100644
--- a/docs/_includes/faq.html
+++ b/docs/_includes/faq.html
@@ -52,7 +52,7 @@ <h1 id="whos-working-on-it">Who’s working on it?</h1>
 
                 <div class="contributor">
                     <a href="http://www.d-d.me">
-                        <img src="{{ site.baseurl }}/images/petrashko.png">
+                        <img src="{{ site.baseurl }}/images/petrashko.jpg">
                     </a>
                     Dmitry Petrashko
                 </div>
@@ -67,21 +67,21 @@ <h1 id="whos-working-on-it">Who’s working on it?</h1>
             <div class="contributors-cell">
                 <div class="contributor">
                     <a href="http://fengy.me/">
-                        <img src="{{ site.baseurl }}/images/fengyun.png">
+                        <img src="{{ site.baseurl }}/images/fengyun.jpg">
                     </a>
                     Liu Fengyun
                 </div>
 
                 <div class="contributor">
                     <a href="https://github.com/felixmulder">
-                        <img src="{{ site.baseurl }}/images/felix.jpeg">
+                        <img src="{{ site.baseurl }}/images/felix.jpg">
                     </a>
                     Felix Mulder
                 </div>
 
                 <div class="contributor">
                     <a href="https://github.com/nicolasstucki">
-                        <img src="{{ site.baseurl }}/images/nico.png">
+                        <img src="{{ site.baseurl }}/images/nico.jpg">
                     </a>
                     Nicolas Stucki
                 </div>
@@ -89,14 +89,14 @@ <h1 id="whos-working-on-it">Who’s working on it?</h1>
             <div class="contributors-cell">
                 <div class="contributor">
                     <a href="http://github.com/OlivierBlanvillain">
-                        <img src="{{ site.baseurl }}/images/olivier.jpeg">
+                        <img src="{{ site.baseurl }}/images/olivier.jpg">
                     </a>
                     Olivier Blanvillain
                 </div>
 
                 <div class="contributor">
                     <a href="http://github.com/biboudis">
-                        <img src="{{ site.baseurl }}/images/aggelos.png">
+                        <img src="{{ site.baseurl }}/images/aggelos.jpg">
                     </a>
                     Aggelos Biboudis
                 </div>
diff --git a/docs/images/aggelos.jpg b/docs/images/aggelos.jpg
new file mode 100644
index 000000000000..050a44edb67f
Binary files /dev/null and b/docs/images/aggelos.jpg differ
diff --git a/docs/images/aggelos.png b/docs/images/aggelos.png
deleted file mode 100644
index c9d4cefccbbd..000000000000
Binary files a/docs/images/aggelos.png and /dev/null differ
diff --git a/docs/images/felix.jpeg b/docs/images/felix.jpeg
deleted file mode 100644
index 4db2642fbe87..000000000000
Binary files a/docs/images/felix.jpeg and /dev/null differ
diff --git a/docs/images/felix.jpg b/docs/images/felix.jpg
new file mode 100644
index 000000000000..a2ecfe933100
Binary files /dev/null and b/docs/images/felix.jpg differ
diff --git a/docs/images/fengyun.jpg b/docs/images/fengyun.jpg
new file mode 100644
index 000000000000..ed5de3159957
Binary files /dev/null and b/docs/images/fengyun.jpg differ
diff --git a/docs/images/fengyun.png b/docs/images/fengyun.png
deleted file mode 100644
index cb7e5d19cc57..000000000000
Binary files a/docs/images/fengyun.png and /dev/null differ
diff --git a/docs/images/martin.jpg b/docs/images/martin.jpg
index c77654796b51..88fcde550d02 100644
Binary files a/docs/images/martin.jpg and b/docs/images/martin.jpg differ
diff --git a/docs/images/nico.jpg b/docs/images/nico.jpg
new file mode 100644
index 000000000000..aa890470841d
Binary files /dev/null and b/docs/images/nico.jpg differ
diff --git a/docs/images/nico.png b/docs/images/nico.png
deleted file mode 100644
index 32ebbed4a099..000000000000
Binary files a/docs/images/nico.png and /dev/null differ
diff --git a/docs/images/olivier.jpeg b/docs/images/olivier.jpeg
deleted file mode 100644
index 7c11e1de3bfb..000000000000
Binary files a/docs/images/olivier.jpeg and /dev/null differ
diff --git a/docs/images/olivier.jpg b/docs/images/olivier.jpg
new file mode 100644
index 000000000000..62f899d16d42
Binary files /dev/null and b/docs/images/olivier.jpg differ
diff --git a/docs/images/petrashko.jpg b/docs/images/petrashko.jpg
new file mode 100644
index 000000000000..dc402cd61b21
Binary files /dev/null and b/docs/images/petrashko.jpg differ
diff --git a/docs/images/petrashko.png b/docs/images/petrashko.png
deleted file mode 100644
index 9b1a0fadb38e..000000000000
Binary files a/docs/images/petrashko.png and /dev/null differ
diff --git a/docs/images/smarter.jpg b/docs/images/smarter.jpg
index 03e7ab8d3d1f..5e5a0cf5a1b8 100644
Binary files a/docs/images/smarter.jpg and b/docs/images/smarter.jpg differ