diff --git a/Av1an/arg_parse.py b/Av1an/arg_parse.py
index 13fb530..53b629a 100755
--- a/Av1an/arg_parse.py
+++ b/Av1an/arg_parse.py
@@ -81,6 +81,7 @@ class Args:
         io_group.add_argument('--resume', '-r', help='Resuming previous session', action='store_true')
         io_group.add_argument('--keep', help='Keep temporally folder after encode', action='store_true')
         io_group.add_argument('--config', '-c', type=str, default=None, help="Path to config file, create if doesn't exists")
+        io_group.add_argument('--webm', default=False, action='store_true', help="Output to webm")
 
         # Splitting
         split_group = parser.add_argument_group('Splitting')
diff --git a/Projects/Project.py b/Projects/Project.py
index 34d560b..28cbf79 100644
--- a/Projects/Project.py
+++ b/Projects/Project.py
@@ -18,6 +18,7 @@ class Project(object):
         self.output_file: Path = None
         self.mkvmerge: bool = None
         self.config = None
+        self.webm = None
 
         # Splitting
         self.chunk_method: str = None
@@ -105,7 +106,11 @@ class Project(object):
 
         :param project: the Project
         """
-        suffix = '.mkv'
+        if self.webm:
+            suffix = '.webm'
+        else:
+            suffix = '.mkv'
+
         self.output_file = Path(self.output_file).with_suffix(suffix) if self.output_file \
             else Path(f'{self.input.stem}_{self.encoder}{suffix}')
 
diff --git a/README.md b/README.md
index 08f7c08..4c44028 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,9 @@ With your own parameters:
                             Options provided to cli overwrite config values.
                             All options excepth in/out/vmaf/log/temp/config paths are saved.
 
+    --webm                  Outputs webm file.
+                            Use only if you're sure source video and audio is compatible.
+
 <h3 align="center">FFmpeg options</h3>
 
     -a   --audio_params     FFmpeg audio settings (Default: copy audio from source to output)