diff --git a/src/main/java/de/marhali/easyi18n/io/translator/PropertiesTranslatorIO.java b/src/main/java/de/marhali/easyi18n/io/translator/PropertiesTranslatorIO.java
new file mode 100644
index 0000000..c03cb40
--- /dev/null
+++ b/src/main/java/de/marhali/easyi18n/io/translator/PropertiesTranslatorIO.java
@@ -0,0 +1,123 @@
+package de.marhali.easyi18n.io.translator;
+
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.vfs.LocalFileSystem;
+import com.intellij.openapi.vfs.VirtualFile;
+
+import de.marhali.easyi18n.data.LocalizedNode;
+import de.marhali.easyi18n.data.Translations;
+import de.marhali.easyi18n.util.TranslationsUtil;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+import java.util.function.Consumer;
+
+/**
+ * Implementation for properties translation files.
+ * @author marhali
+ */
+public class PropertiesTranslatorIO implements TranslatorIO {
+
+    public static final String FILE_EXTENSION = "properties";
+
+    @Override
+    public void read(@NotNull String directoryPath, @NotNull Consumer<Translations> callback) {
+        ApplicationManager.getApplication().saveAll(); // Save opened files (required if new locales were added)
+
+        ApplicationManager.getApplication().runReadAction(() -> {
+            VirtualFile directory = LocalFileSystem.getInstance().findFileByIoFile(new File(directoryPath));
+
+            if(directory == null || directory.getChildren() == null) {
+                throw new IllegalArgumentException("Specified folder is invalid (" + directoryPath + ")");
+            }
+
+            VirtualFile[] files = directory.getChildren();
+
+            List<String> locales = new ArrayList<>();
+            LocalizedNode nodes = new LocalizedNode(LocalizedNode.ROOT_KEY, new ArrayList<>());
+
+            try {
+                for (VirtualFile file : files) {
+                    locales.add(file.getNameWithoutExtension());
+                    Properties properties = new Properties();
+                    properties.load(new InputStreamReader(file.getInputStream()));;
+                    readProperties(file.getNameWithoutExtension(), properties, nodes);
+                }
+
+                callback.accept(new Translations(locales, nodes));
+
+            } catch(IOException e) {
+                e.printStackTrace();
+                callback.accept(null);
+            }
+        });
+    }
+
+    @Override
+    public void save(@NotNull Translations translations, @NotNull String directoryPath, @NotNull Consumer<Boolean> callback) {
+        ApplicationManager.getApplication().runWriteAction(() -> {
+            try {
+                for(String locale : translations.getLocales()) {
+                    Properties properties = new Properties();
+                    writeProperties(locale, properties, translations.getNodes(), "");
+
+                    String fullPath = directoryPath + "/" + locale + "." + FILE_EXTENSION;
+                    VirtualFile file = LocalFileSystem.getInstance().findFileByIoFile(new File(fullPath));
+
+                    ByteArrayOutputStream content = new ByteArrayOutputStream();
+                    properties.store(content, "I18n " + locale + " keys");
+                    file.setBinaryContent(content.toByteArray());
+                }
+
+                // Successfully saved
+                callback.accept(true);
+
+            } catch(IOException e) {
+                e.printStackTrace();
+                callback.accept(false);
+            }
+        });
+    }
+
+    private void writeProperties(String locale, Properties props, LocalizedNode node, String parentPath) {
+        if(node.isLeaf() && !node.getKey().equals(LocalizedNode.ROOT_KEY)) {
+            if(node.getValue().get(locale) != null) { // Translation is defined - track it
+                props.setProperty(parentPath, node.getValue().get(locale));
+            }
+
+        } else {
+            for(LocalizedNode children : node.getChildren()) {
+                writeProperties(locale, props, children,
+                        parentPath + (parentPath.isEmpty() ? "" : ".") + children.getKey());
+            }
+        }
+    }
+
+    private void readProperties(String locale, Properties props, LocalizedNode parent) {
+        props.forEach((key, value) -> {
+            List<String> sections = TranslationsUtil.getSections(String.valueOf(key));
+
+            LocalizedNode node = parent;
+
+            for (String section : sections) {
+                LocalizedNode subNode = node.getChildren(section);
+
+                if(subNode == null) {
+                    subNode = new LocalizedNode(section, new ArrayList<>());
+                    node.addChildren(subNode);
+                }
+
+                node = subNode;
+            }
+
+            Map<String, String> messages = node.getValue();
+            messages.put(locale, String.valueOf(value));
+            node.setValue(messages);
+        });
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/marhali/easyi18n/util/IOUtil.java b/src/main/java/de/marhali/easyi18n/util/IOUtil.java
index 0ad9162..ff8a318 100644
--- a/src/main/java/de/marhali/easyi18n/util/IOUtil.java
+++ b/src/main/java/de/marhali/easyi18n/util/IOUtil.java
@@ -3,15 +3,27 @@ package de.marhali.easyi18n.util;
 import com.intellij.openapi.vfs.LocalFileSystem;
 import com.intellij.openapi.vfs.VirtualFile;
 import de.marhali.easyi18n.io.translator.JsonTranslatorIO;
+import de.marhali.easyi18n.io.translator.PropertiesTranslatorIO;
 import de.marhali.easyi18n.io.translator.TranslatorIO;
 
+import org.jetbrains.annotations.NotNull;
+
 import java.io.File;
 import java.util.Arrays;
 import java.util.Optional;
 
+/**
+ * IO operations utility.
+ * @author marhali
+ */
 public class IOUtil {
 
-    public static TranslatorIO determineFormat(String directoryPath) {
+    /**
+     * Determines the {@link TranslatorIO} which should be used for the specified directoryPath
+     * @param directoryPath The full path to the parent directory which holds the translation files
+     * @return IO handler to use for file operations
+     */
+    public static TranslatorIO determineFormat(@NotNull String directoryPath) {
         VirtualFile directory = LocalFileSystem.getInstance().findFileByIoFile(new File(directoryPath));
 
         if(directory == null || directory.getChildren() == null) {
@@ -21,7 +33,7 @@ public class IOUtil {
         Optional<VirtualFile> any = Arrays.stream(directory.getChildren()).findAny();
 
         if(!any.isPresent()) {
-            throw new IllegalStateException("Could not determine format");
+            throw new IllegalStateException("Could not determine i18n format. At least one locale file must be defined");
         }
 
         switch (any.get().getFileType().getDefaultExtension().toLowerCase()) {
@@ -29,10 +41,10 @@ public class IOUtil {
                 return new JsonTranslatorIO();
 
             case "properties":
-                throw new UnsupportedOperationException();
+                return new PropertiesTranslatorIO();
 
             default:
-                throw new UnsupportedOperationException("Unsupported format: " +
+                throw new UnsupportedOperationException("Unsupported i18n locale file format: " +
                         any.get().getFileType().getDefaultExtension());
         }
     }