diff --git a/build.sbt b/build.sbt
index 547d302..60f534e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -49,6 +49,7 @@
   "com.github.bkromhout"      % "java-diff-utils"              % "2.1.1",
   "org.cache2k"               % "cache2k-all"                  % "1.0.0.CR1",
   "com.enragedginger"        %% "akka-quartz-scheduler"        % "1.4.0-akka-2.3.x" exclude("c3p0","c3p0"),
+  "net.coobird" % "thumbnailator" % "0.4.8",
   "org.eclipse.jetty"         % "jetty-webapp"                 % JettyVersion     % "provided",
   "javax.servlet"             % "javax.servlet-api"            % "3.1.0"          % "provided",
   "junit"                     % "junit"                        % "4.12"           % "test",
diff --git a/src/main/scala/gitbucket/core/controller/ControllerBase.scala b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
index 5db473f..0af53cc 100644
--- a/src/main/scala/gitbucket/core/controller/ControllerBase.scala
+++ b/src/main/scala/gitbucket/core/controller/ControllerBase.scala
@@ -20,6 +20,8 @@
 
 import scala.util.Try
 
+import net.coobird.thumbnailator.Thumbnails
+
 
 /**
  * Provides generic features for controller implementations.
@@ -225,10 +227,9 @@
     } else {
       fileId.map { fileId =>
         val filename = "avatar." + FileUtil.getExtension(session.getAndRemove(Keys.Session.Upload(fileId)).get)
-        FileUtils.moveFile(
-          new java.io.File(getTemporaryDir(session.getId), fileId),
-          new java.io.File(getUserUploadDir(userName), filename)
-        )
+        Thumbnails.of(new java.io.File(getTemporaryDir(session.getId), fileId))
+          .size(324, 324)
+          .toFile(new java.io.File(getUserUploadDir(userName), filename))
         updateAvatarImage(userName, Some(filename))
       }
     }