diff --git a/gio-qt/include/dglibutils.h b/gio-qt/include/dglibutils.h
index 4f5ce8e..367ab5c 100644
--- a/gio-qt/include/dglibutils.h
+++ b/gio-qt/include/dglibutils.h
@@ -37,6 +37,15 @@ enum DGlibUserDirectory
 };
 Q_ENUMS(DGlibUserDirectory);
 
+enum DGlibFormatSizeFlag
+{
+    FORMAT_SIZE_DEFAULT = 0x0,
+    FORMAT_SIZE_LONG_FORMAT = 1 << 0,
+    FORMAT_SIZE_IEC_UNITS = 1 << 1,
+    FORMAT_SIZE_BITS = 1 << 2
+};
+Q_DECLARE_FLAGS(DGlibFormatSizeFlags, DGlibFormatSizeFlag)
+
 class DGlibUtils
 {
 public:
@@ -44,6 +53,7 @@ public:
     static QStringList systemDataDirs();
     static QString userDataDir();
     static QString tmpDir();
+    static QString formatSize(quint64 size, DGlibFormatSizeFlags flags = FORMAT_SIZE_DEFAULT);
 };
 
 #endif // DGLIBUTILS_H
diff --git a/gio-qt/source/dglibutils.cpp b/gio-qt/source/dglibutils.cpp
index 00cf716..6daf4b2 100644
--- a/gio-qt/source/dglibutils.cpp
+++ b/gio-qt/source/dglibutils.cpp
@@ -93,3 +93,21 @@ QString DGlibUtils::tmpDir()
 {
     return QString::fromStdString(Glib::get_tmp_dir());
 }
+
+/*!
+ * \brief Formats a size (for example the size of a file) into a human readable string.
+ *
+ * Sizes are rounded to the nearest size prefix (kB, MB, GB) and are displayed rounded to the nearest tenth. E.g. the file
+ * size 3292528 bytes will be converted into the string "3.2 MB".
+ *
+ * The prefix units base is 1000 (i.e. 1 kB is 1000 bytes), unless the DGlibFormatSizeFlags::FORMAT_SIZE_IEC_UNITS flag is set.
+ *
+ * \param size A size in bytes.
+ * \param flags Flags to modify the output.
+ * \return A formatted string containing a human readable file size.
+ */
+QString DGlibUtils::formatSize(quint64 size, DGlibFormatSizeFlags flags)
+{
+    unsigned int flagValue = flags;
+    return QString::fromStdString(Glib::format_size(size, static_cast<Glib::FormatSizeFlags>(flagValue)));
+}
diff --git a/test/tst_matchgioenum.cpp b/test/tst_matchgioenum.cpp
index 3b2fef2..bf98a68 100644
--- a/test/tst_matchgioenum.cpp
+++ b/test/tst_matchgioenum.cpp
@@ -4,6 +4,7 @@
 #include <dgiofile.h>
 #include <dgiofileinfo.h>
 #include <dgiomountoperation.h>
+#include <dglibutils.h>
 
 #include <giomm.h>
 
@@ -15,6 +16,7 @@ public:
     DGioMatchGioEnumTest();
 
 private Q_SLOTS:
+    void testCase_DGlibUtilsClass();
     void testCase_DGioFileClass();
     void testCase_DGioFileInfoClass();
     void testCase_DGioMountOperationClass();
@@ -25,6 +27,14 @@ DGioMatchGioEnumTest::DGioMatchGioEnumTest()
     //
 }
 
+void DGioMatchGioEnumTest::testCase_DGlibUtilsClass()
+{
+    QCOMPARE(DGlibFormatSizeFlag::FORMAT_SIZE_DEFAULT, Glib::FORMAT_SIZE_DEFAULT);
+    QCOMPARE(DGlibFormatSizeFlag::FORMAT_SIZE_LONG_FORMAT, Glib::FORMAT_SIZE_LONG_FORMAT);
+    QCOMPARE(DGlibFormatSizeFlag::FORMAT_SIZE_IEC_UNITS, Glib::FORMAT_SIZE_IEC_UNITS);
+    QCOMPARE(DGlibFormatSizeFlag::FORMAT_SIZE_BITS, Glib::FORMAT_SIZE_BITS);
+}
+
 void DGioMatchGioEnumTest::testCase_DGioFileClass()
 {
     QCOMPARE(DGioFileQueryInfoFlag::FILE_QUERY_INFO_NONE, Gio::FILE_QUERY_INFO_NONE);