diff --git a/include/tools/otherTools.h b/include/tools/otherTools.h
index a6dc47234..2f95f3fc2 100644
--- a/include/tools/otherTools.h
+++ b/include/tools/otherTools.h
@@ -21,6 +21,7 @@
 #define KIWIX_OTHERTOOLS_H
 
 #include <string>
+#include <vector>
 
 namespace pugi {
   class xml_node;
@@ -28,9 +29,18 @@ namespace pugi {
 
 namespace kiwix
 {
-void sleep(unsigned int milliseconds);
-std::string nodeToString(const pugi::xml_node& node);
-std::string converta2toa3(const std::string& a2code);
+  void sleep(unsigned int milliseconds);
+  std::string nodeToString(const pugi::xml_node& node);
+  std::string converta2toa3(const std::string& a2code);
+
+  /*
+   * Convert all format tag string to new format
+   */
+  std::vector<std::string> convertTags(const std::string& tags_str);
+  std::string getTagValueFromTagList(const std::vector<std::string>& tagList,
+                                     const std::string& tagName);
+  bool convertStrToBool(const std::string& value);
+
 }
 
 #endif
diff --git a/src/reader.cpp b/src/reader.cpp
index 87cedc550..d6874724a 100644
--- a/src/reader.cpp
+++ b/src/reader.cpp
@@ -22,6 +22,8 @@
 
 #include <zim/search.h>
 
+#include "tools/otherTools.h"
+
 inline char hi(char v)
 {
   char hex[] = "0123456789abcdef";
@@ -352,43 +354,6 @@ string Reader::getLicense() const
   METADATA("License")
 }
 
-std::vector<std::string> convertTags(const std::string& tags_str)
-{
-  auto tags = split(tags_str, ";");
-  std::vector<std::string> tagsList;
-  bool picSeen(false), vidSeen(false), detSeen(false), indexSeen(false);
-  for (auto tag: tags) {
-    picSeen |= (tag == "nopic" || startsWith(tag, "_pictures:"));
-    vidSeen |= (tag == "novid" || startsWith(tag, "_videos:"));
-    detSeen |= (tag == "nodet" || startsWith(tag, "_details:"));
-    indexSeen |= startsWith(tag, "_ftindex");
-    if (tag == "nopic") {
-      tagsList.push_back("_pictures:no");
-    } else if (tag == "novid") {
-      tagsList.push_back("_videos:no");
-    } else if (tag == "nodet") {
-      tagsList.push_back("_details:no");
-    } else if (tag == "_ftindex") {
-      tagsList.push_back("_ftindex:yes");
-    } else {
-      tagsList.push_back(tag);
-    }
-  }
-  if (!indexSeen) {
-    tagsList.push_back("_ftindex:no");
-  }
-  if (!picSeen) {
-    tagsList.push_back("_pictures:yes");
-  }
-  if (!vidSeen) {
-    tagsList.push_back("_videos:yes");
-  }
-  if (!detSeen) {
-    tagsList.push_back("_details:yes");
-  }
-  return tagsList;
-}
-
 string Reader::getTags(bool original) const
 {
   string tags_str;
@@ -400,26 +365,6 @@ string Reader::getTags(bool original) const
   return join(tags, ";");
 }
 
-string getTagValueFromTagList(const std::vector<std::string>& tagList, const std::string& tagName)
-{
-  for (auto tag: tagList) {
-    if (tag[0] == '_') {
-      auto delimPos = tag.find(':');
-      if (delimPos == string::npos) {
-        // No delimiter... what to do ?
-        continue;
-      }
-      auto cTagName = tag.substr(1, delimPos-1);
-      auto cTagValue = tag.substr(delimPos+1);
-      if (cTagName == tagName) {
-        return cTagValue;
-      }
-    }
-  }
-  std::stringstream ss;
-  ss << tagName << " cannot be found";
-  throw std::out_of_range(ss.str());
-}
 
 string Reader::getTagStr(const std::string& tagName) const
 {
@@ -430,16 +375,7 @@ string Reader::getTagStr(const std::string& tagName) const
 
 bool Reader::getTagBool(const std::string& tagName) const
 {
-  auto tagValue = getTagStr(tagName);
-  if (tagValue == "yes") {
-    return true;
-  } else if (tagValue == "no") {
-    return false;
-  } else {
-    std::stringstream ss;
-    ss << "Tag value '" << tagValue << "' for " << tagName << " cannot be converted to bool.";
-    throw std::domain_error(ss.str());
-  }
+  return convertStrToBool(getTagStr(tagName));
 }
 
 string Reader::getRelation() const
diff --git a/src/tools/otherTools.cpp b/src/tools/otherTools.cpp
index 538d87104..e4ae850be 100644
--- a/src/tools/otherTools.cpp
+++ b/src/tools/otherTools.cpp
@@ -25,7 +25,10 @@
 #include <unistd.h>
 #endif
 
+#include "tools/stringTools.h"
+
 #include <map>
+#include <sstream>
 #include <pugixml.hpp>
 
 
@@ -204,3 +207,76 @@ std::string kiwix::nodeToString(const pugi::xml_node& node)
 std::string kiwix::converta2toa3(const std::string& a2code){
   return codeisomapping.at(a2code);
 }
+
+std::vector<std::string> kiwix::convertTags(const std::string& tags_str)
+{
+  auto tags = kiwix::split(tags_str, ";");
+  std::vector<std::string> tagsList;
+  bool picSeen(false), vidSeen(false), detSeen(false), indexSeen(false);
+  for (auto tag: tags) {
+    picSeen |= (tag == "nopic" || startsWith(tag, "_pictures:"));
+    vidSeen |= (tag == "novid" || startsWith(tag, "_videos:"));
+    detSeen |= (tag == "nodet" || startsWith(tag, "_details:"));
+    indexSeen |= kiwix::startsWith(tag, "_ftindex");
+    if (tag == "nopic") {
+      tagsList.push_back("_pictures:no");
+    } else if (tag == "novid") {
+      tagsList.push_back("_videos:no");
+    } else if (tag == "nodet") {
+      tagsList.push_back("_details:no");
+    } else if (tag == "_ftindex") {
+      tagsList.push_back("_ftindex:yes");
+    } else {
+      tagsList.push_back(tag);
+    }
+  }
+  if (!indexSeen) {
+    tagsList.push_back("_ftindex:no");
+  }
+  if (!picSeen) {
+    tagsList.push_back("_pictures:yes");
+  }
+  if (!vidSeen) {
+    tagsList.push_back("_videos:yes");
+  }
+  if (!detSeen) {
+    tagsList.push_back("_details:yes");
+  }
+  return tagsList;
+}
+
+std::string kiwix::getTagValueFromTagList(
+  const std::vector<std::string>& tagList, const std::string& tagName)
+{
+  for (auto tag: tagList) {
+    if (tag[0] == '_') {
+      auto delimPos = tag.find(':');
+      if (delimPos == std::string::npos) {
+        // No delimiter... what to do ?
+        continue;
+      }
+      auto cTagName = tag.substr(1, delimPos-1);
+      auto cTagValue = tag.substr(delimPos+1);
+      if (cTagName == tagName) {
+        return cTagValue;
+      }
+    }
+  }
+  std::stringstream ss;
+  ss << tagName << " cannot be found";
+  throw std::out_of_range(ss.str());
+}
+
+bool kiwix::convertStrToBool(const std::string& value)
+{
+  if (value == "yes") {
+    return true;
+  } else if (value == "no") {
+    return false;
+  }
+
+  std::stringstream ss;
+  ss << "Tag value '" << value << "' cannot be converted to bool.";
+  throw std::domain_error(ss.str());
+}
+