diff --git a/jadx-gui/build.gradle b/jadx-gui/build.gradle
index c147a3a0ddd56479d3260cb030a3447b0586bee5..7545af042fbf91c30736b33a1d0f6f73710b2401 100644
--- a/jadx-gui/build.gradle
+++ b/jadx-gui/build.gradle
@@ -138,3 +138,8 @@ task distWinWithJre(type: Zip, dependsOn: ['copyDistWinWithJre']) {
 	}
 	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 }
+
+task addNewNLSLines(type: JavaExec) {
+	classpath = sourceSets.main.runtimeClasspath
+	mainClass.set('jadx.gui.utils.tools.NLSAddNewLines')
+}
diff --git a/jadx-gui/src/main/java/jadx/gui/utils/tools/NLSAddNewLines.java b/jadx-gui/src/main/java/jadx/gui/utils/tools/NLSAddNewLines.java
new file mode 100644
index 0000000000000000000000000000000000000000..7773bfaf12f2e7ce40e5c09f0b8e31555153d09f
--- /dev/null
+++ b/jadx-gui/src/main/java/jadx/gui/utils/tools/NLSAddNewLines.java
@@ -0,0 +1,121 @@
+package jadx.gui.utils.tools;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.stream.Stream;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Automatically add new i18n lines from reference (EN) into others languages
+ */
+public class NLSAddNewLines {
+	private static final Logger LOG = LoggerFactory.getLogger(NLSAddNewLines.class);
+
+	private static final Path I18N_PATH = Paths.get("src/main/resources/i18n/");
+	private static final String GUI_MODULE_DIR = "jadx-gui";
+
+	public static void main(String[] args) {
+		try {
+			process();
+		} catch (Exception e) {
+			LOG.error("Failed to add new i18n lines", e);
+		}
+	}
+
+	private static void process() throws Exception {
+		String reference = "Messages_en_US.properties";
+		Path refPath = getRefPath(reference);
+		List<String> refLines = Files.readAllLines(refPath);
+
+		try (Stream<Path> pathStream = Files.list(refPath.toAbsolutePath().getParent())) {
+			pathStream.forEach(path -> {
+				if (path.getFileName().equals(refPath.getFileName())) {
+					return;
+				}
+				try {
+					applyFix(refLines, path);
+				} catch (Exception e) {
+					throw new RuntimeException(e);
+				}
+			});
+		}
+	}
+
+	private static void applyFix(List<String> refLines, Path path) throws IOException {
+		List<String> lines = Files.readAllLines(path);
+		int linesCount = lines.size();
+		if (refLines.size() <= linesCount) {
+			LOG.info("Skip {}, already fixed", path);
+			return;
+		}
+		boolean updated = false;
+		for (int i = 0; i < linesCount; i++) {
+			String line = lines.get(i);
+			String refLine = refLines.get(i);
+			if (!isSameKey(refLine, line)) {
+				if (refLine.isEmpty()) {
+					lines.add(i, "");
+				} else {
+					lines.add(i, "#" + refLine);
+				}
+				updated = true;
+			}
+		}
+		if (updated) {
+			LOG.info("Updating {}", path);
+			Files.write(path, lines, StandardCharsets.UTF_8);
+		}
+	}
+
+	private static boolean isSameKey(String refLine, String line) {
+		int refLen = refLine.length();
+		int len = line.length();
+		if (refLen == 0) {
+			return len == 0;
+		}
+		if (len == 0) {
+			return false;
+		}
+		int pos = 0;
+		// skip comment and spaces
+		while (pos < len) {
+			char ch = line.charAt(pos);
+			if (ch == '#' || ch == ' ') {
+				pos++;
+			} else {
+				break;
+			}
+		}
+		int refPos = 0;
+		while (true) {
+			char refCh = refLine.charAt(refPos);
+			if (refCh == ' ' || refCh == '=') {
+				return true;
+			}
+			char ch = line.charAt(pos);
+			if (refCh != ch) {
+				return false;
+			}
+			refPos++;
+			pos++;
+		}
+	}
+
+	private static Path getRefPath(String reference) {
+		Path path = I18N_PATH.resolve(reference);
+		if (Files.exists(path)) {
+			return path;
+		}
+		Path rootPath = Paths.get(GUI_MODULE_DIR).resolve(I18N_PATH).resolve(reference);
+		if (Files.exists(rootPath)) {
+			return rootPath;
+		}
+		throw new RuntimeException("Can't find reference I18N: " + reference);
+	}
+}