diff --git a/json2m3t.py b/json2m3t.py
new file mode 100644
index 0000000..9ac68dc
--- /dev/null
+++ b/json2m3t.py
@@ -0,0 +1,47 @@
+from json import load
+from os import listdir, makedirs
+from os.path import isdir, join, basename, splitext, dirname, exists
+
+
+def merge_m3t(source_json: str, trans_json: str, output_m3t: str):
+    with open(source_json, 'r', encoding='UTF-8') as f:
+        sources = load(f)
+    with open(trans_json, 'r', encoding='UTF-8') as f:
+        trans = load(f)
+    if len(sources) != len(trans):
+        print(f"message not matched. source {source_json} length {len(sources)}, trans {trans_json} length {len(trans)}")
+    with open(output_m3t, 'w', encoding='UTF-8') as f:
+        for src, tran in zip(sources, trans):
+            if 'name' in src:
+                f.write('○ NAME: ' + src['name'] + '\n\n')
+            f.write('○' + src['message'].replace('\n', '\\n') + '\n')
+            f.write('●' + tran['message'].replace('\n', '\\n') + '\n\n')
+
+
+def merge_m3t_auto(source_json: str, trans_json: str, output_m3t: str):
+    if isdir(source_json):
+        makedirs(output_m3t, exist_ok=True)
+        for file in listdir(source_json):
+            if not file.lower().endswith(".json"):
+                continue
+            source_full = join(source_json, file)
+            trans_full = join(trans_json, file)
+            if not exists(trans_full):
+                continue
+            output_full = join(output_m3t, splitext(basename(file))[0] + ".m3t")
+            merge_m3t(source_full, trans_full, output_full)
+    else:
+        pdir = dirname(output_m3t)
+        if pdir and not isdir(pdir):
+            makedirs(pdir, exist_ok=True)
+        merge_m3t(source_json, trans_json, output_m3t)
+
+
+if __name__ == "__main__":
+    from argparse import ArgumentParser
+    parser = ArgumentParser(description="Merge source JSON and translation JSON into m3t format")
+    parser.add_argument("source_json", help="Path to source JSON file or directory")
+    parser.add_argument("trans_json", help="Path to translation JSON file or directory")
+    parser.add_argument("output_m3t", help="Path to output m3t file or directory")
+    args = parser.parse_args()
+    merge_m3t_auto(args.source_json, args.trans_json, args.output_m3t)