diff --git a/README.md b/README.md
index 105604d..0f52264 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Using Anonymous Github
 
 To use it, open the main page (e.g., [http://anonymous.4open.science/](http://anonymous.4open.science/)), login with GitHub, and click on "Anonymize".
 Simply fill 1. the Github repo URL and 2. the id of the anonymized repository, 3. the terms to anonymize (which can be updated afterward). 
-The anonymization of the content is done by replacing all occurrences of words in a list by "XXX". 
+The anonymization of the content is done by replacing all occurrences of words in a list by "XXXX" (can be changed in the configuration). 
 The word list is provided by the authors, and typically contains the institution name, author names, logins, etc...
 The README is anonymized as well as all files of the repository. Even filenames are anonymized. 
 
diff --git a/config.js b/config.js
index 0e48b53..fe41527 100644
--- a/config.js
+++ b/config.js
@@ -5,6 +5,7 @@ const config = {
   MAX_FILE_SIZE: 10 * 1024 * 1024, // in b
   MAX_REPO_SIZE: 8 * 1024, // in kb
   AUTH_CALLBACK: "http://localhost:5000/github/auth",
+  ANONYMIZATION_MASK: "XXXX"
 };
 for (let conf in process.env) {
   if (config[conf] !== undefined) {
diff --git a/public/script/homeApp.js b/public/script/homeApp.js
index 4901bc7..a3eee9b 100644
--- a/public/script/homeApp.js
+++ b/public/script/homeApp.js
@@ -454,6 +454,8 @@ angular
       if (v == "stream") {
         $scope.options.loc = false;
         $scope.anonymize.loc.$$element[0].disabled = true;
+      } else {
+        $scope.anonymize.loc.$$element[0].disabled = false;
       }
     });
 
@@ -530,7 +532,7 @@ angular
         );
       }
       if (!$scope.options.link) {
-        content = content.replace(urlRegex, "XXX");
+        content = content.replace(urlRegex, "XXXX");
       }
 
       content = content.replace(
@@ -553,12 +555,12 @@ angular
         // remove whole url if it contains the term
 
         content = content.replace(urlRegex, (match) => {
-          if (new RegExp(`\\b${term}\\b`, "gi").test(match)) return "XXX";
+          if (new RegExp(`\\b${term}\\b`, "gi").test(match)) return "XXXX";
           return match;
         });
 
         // remove the term in the text
-        content = content.replace(new RegExp(`\\b${term}\\b`, "gi"), "XXX");
+        content = content.replace(new RegExp(`\\b${term}\\b`, "gi"), "XXXX");
       }
 
       $scope.anonymize_readme = content;
diff --git a/utils/anonymize.js b/utils/anonymize.js
index 144dfd9..2286f8e 100644
--- a/utils/anonymize.js
+++ b/utils/anonymize.js
@@ -2,6 +2,7 @@ const fs = require("fs").promises;
 const ofs = require("fs");
 const path = require("path");
 const fileUtils = require("./file");
+const config = require("../config")
 
 const anonymizeContent = (content, repoConfig) => {
   const urlRegex = /<?\b((https?|ftp|file):\/\/)[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]\b\/?>?/g;
@@ -16,7 +17,7 @@ const anonymizeContent = (content, repoConfig) => {
 
   if (!repoConfig.options.link) {
     // remove all links
-    content = content.replace(urlRegex, "XXX");
+    content = content.replace(urlRegex, config.ANONYMIZATION_MASK);
   }
 
   content = content.replace(
@@ -44,12 +45,12 @@ const anonymizeContent = (content, repoConfig) => {
     }
     // remove whole url if it contains the term
     content = content.replace(urlRegex, (match) => {
-      if (new RegExp(`\\b${term}\\b`, "gi").test(match)) return "XXX";
+      if (new RegExp(`\\b${term}\\b`, "gi").test(match)) return config.ANONYMIZATION_MASK;
       return match;
     });
 
     // remove the term in the text
-    content = content.replace(new RegExp(`\\b${term}\\b`, "gi"), "XXX");
+    content = content.replace(new RegExp(`\\b${term}\\b`, "gi"), config.ANONYMIZATION_MASK);
   }
   return content;
 };
@@ -59,7 +60,7 @@ const anonymizePath = (path, repoConfig) => {
     if (term.trim() == "") {
       continue;
     }
-    path = path.replace(new RegExp(term, "gi"), "XXX");
+    path = path.replace(new RegExp(term, "gi"), config.ANONYMIZATION_MASK);
   }
   return path;
 };
diff --git a/utils/file.js b/utils/file.js
index 869f60e..0258672 100644
--- a/utils/file.js
+++ b/utils/file.js
@@ -322,7 +322,7 @@ module.exports.isFilePathValid = async (options) => {
   }
 
   let anonymizePath = options.path;
-  if (anonymizePath.indexOf("XXX") > -1) {
+  if (anonymizePath.indexOf(config.ANONYMIZATION_MASK) > -1) {
     const files = await module.exports.getFileList({ repoConfig });
 
     const file = getFile(files, options.path);