diff --git a/discord_bot/__main__.py b/discord_bot/__main__.py
index 4264e13..49509e8 100644
--- a/discord_bot/__main__.py
+++ b/discord_bot/__main__.py
@@ -116,18 +116,12 @@ async def on_message(message: discord.Message):
             if len(args) > 1 and message.author.display_name is not None:
                 left_wmark_text = f"By {message.author.display_name}"
             logging.info(args[0])
-            meme_id = re.sub(r'[^A-Za-z0-9 _]', "", args[0]).strip()
-            args[0] = meme_id
-            img = meme_otron.compute(*args, left_wmark_text=left_wmark_text)
-            if img is None:
-                if len(meme_id) == 0:
-                    response = f":warning: Template not found\n"
-                else:
-                    hint = meme_db.find_nearest(meme_id)
-                    response = f":warning: Template `{meme_id}` not found\n"
-                    if hint is not None:
-                        response += f"Did you mean `{hint}`?\n"
-                response += f"You can find a more detailed help and a list of templates at:\n" \
+            img, errors = meme_otron.compute(*args, left_wmark_text=left_wmark_text)
+            if len(errors) > 0:
+                response = ":warning:"
+                for err in errors:
+                    response += "\n" + err.replace("'", "`").replace("`` ", "")
+                response += f"\nYou can find a more detailed help and a list of templates at:\n" \
                             f"<{DOC_URL}>"
                 if len(response) >= 2000:
                     await message.channel.send(f"{message.author.mention} ... really?")
@@ -138,7 +132,7 @@ async def on_message(message: discord.Message):
                     img.save(output, format="JPEG")
                     response = None
                     if len(args) == 1:
-                        meme = meme_db.get_meme(meme_id)
+                        meme = meme_db.get_meme(utils.sanitize_input(args[0]))
                         response = f"Template `{meme.id}`:"
                         if len(meme.aliases) > 0:
                             response += f"\n- Aliases: `{'`, `'.join(meme.aliases)}`"
diff --git a/meme_otron/__main__.py b/meme_otron/__main__.py
index 29120e4..1fcdd25 100644
--- a/meme_otron/__main__.py
+++ b/meme_otron/__main__.py
@@ -20,11 +20,10 @@ if __name__ == "__main__":
         sys.exit(1)
     else:
         output_file = utils.read_argument(sys.argv, "-o", "--output", valued=True, delete=True)
-        img = meme_otron.compute(*sys.argv[1:])
+        img, errors = meme_otron.compute(*sys.argv[1:])
+        for err in errors:
+            print(err, file=sys.stderr)
         if img is None:
-            proposal = meme_db.find_nearest(sys.argv[1])
-            if proposal is not None:
-                print(f"Did you mean '{proposal}'?", file=sys.stderr)
             sys.exit(1)
         if output_file is None:
             with os.fdopen(os.dup(sys.stdout.fileno())) as output:
diff --git a/meme_otron/meme_otron.py b/meme_otron/meme_otron.py
index 1291cd3..8abae79 100644
--- a/meme_otron/meme_otron.py
+++ b/meme_otron/meme_otron.py
@@ -1,6 +1,5 @@
-import logging
-from typing import Optional
-
+from typing import Optional, Tuple, List
+import re
 from PIL import Image
 
 from .types import Text, Pos
@@ -8,8 +7,6 @@ from . import img_factory
 from . import meme_db
 from . import utils
 
-logger = logging.getLogger("meme_otron")
-
 right_wmark = Text("Made with meme-otron")
 right_wmark.position = Pos.SE
 right_wmark.fill = (128, 128, 128, 128)
@@ -32,19 +29,23 @@ simple_text.x_range = [0.01, 0.99]
 simple_text.y_range = [0.2, 0.8]
 
 
-def compute(*args: str, left_wmark_text: Optional[str] = None, debug: bool = False) -> Optional[Image.Image]:
+def compute(*args: str, left_wmark_text: Optional[str] = None,
+            debug: bool = False) -> Tuple[Optional[Image.Image], List[str]]:
     if len(args) < 1:
-        return None
+        return None, ['Not enough arguments']
 
     parts = utils.split_arguments(args, "-")
     images = []
+    errors = []
     for part in parts:
-        img = compute_part(*part, debug=debug)
+        img, err = compute_part(*part, debug=debug)
         if img is not None:
             images += [img]
+        else:
+            errors += [err]
 
     if len(images) == 0:
-        return None
+        return None, errors
 
     output_image = img_factory.compose_image(images)
 
@@ -53,24 +54,27 @@ def compute(*args: str, left_wmark_text: Optional[str] = None, debug: bool = Fal
         watermarks += [left_wmark.variant(left_wmark_text)]
     output_image = img_factory.apply_texts(output_image, watermarks, debug=debug)
 
-    return output_image
+    return output_image, errors
 
 
-def compute_part(*args: str, debug: bool = False) -> Optional[Image.Image]:
-    meme_id = args[0].lower().strip()
+def compute_part(*args: str, debug: bool = False) -> Tuple[Optional[Image.Image], Optional[str]]:
+    meme_id = utils.sanitize_input(args[0])
 
     if meme_id == "text":
         if len(args) < 2:
-            return None
+            return None, 'Text: not enough arguments'
         texts = [simple_text.variant(arg) for arg in args[1:]]
-        return img_factory.build_text_only(texts, debug=debug)
+        return img_factory.build_text_only(texts, debug=debug), None
     elif meme_id == "image":
-        return None
+        return None, 'Image: not yet implemented'
     else:
         meme = meme_db.get_meme(meme_id)
         if meme is None:
-            logger.warning(f"Meme template '{meme_id}' not found")
-            return None
+            error = f"Template: '{meme_id}' not found."
+            proposal = meme_db.find_nearest(meme_id)
+            if proposal is not None:
+                error += f" Did you mean '{proposal}'?"
+            return None, error
         if len(args) > 1:
             c = 0
             for i in range(len(meme.texts)):
@@ -82,4 +86,4 @@ def compute_part(*args: str, debug: bool = False) -> Optional[Image.Image]:
                     c += 1
                 else:
                     meme.texts[i].text = meme.texts[meme.texts[i].text_ref].text
-        return img_factory.build_from_template(meme.template, meme.texts, debug=debug)
+        return img_factory.build_from_template(meme.template, meme.texts, debug=debug), None
diff --git a/meme_otron/utils.py b/meme_otron/utils.py
index 2d133d9..310b75c 100644
--- a/meme_otron/utils.py
+++ b/meme_otron/utils.py
@@ -142,6 +142,10 @@ def find_nearest(word: str, wlist: List[str], threshold: int = 5) -> Optional[st
     return found[2]
 
 
+def sanitize_input(src: str) -> str:
+    return re.sub(r'[^A-Za-z0-9 _]', "", src.lower().strip())
+
+
 # endregion
 
 # region format utils
diff --git a/tests/unit/meme_otron/test_utils.py b/tests/unit/meme_otron/test_utils.py
index 27c695a..eed3961 100644
--- a/tests/unit/meme_otron/test_utils.py
+++ b/tests/unit/meme_otron/test_utils.py
@@ -93,6 +93,9 @@ class TestUtilsLang(TestCase):
         self.assertIsNone(utils.find_nearest("unknown", ["test", "example", "what"], threshold=2))
         self.assertEqual("test", utils.find_nearest("unknown", ["test", "example", "what"], threshold=200))
 
+    def test_sanitize_input(self):
+        self.assertEqual("", utils.sanitize_input(""))
+        self.assertEqual("a b_c", utils.sanitize_input("  A+=¤$ bé_cè:*  "))
 
 class TestUtilsArgs(TestCase):
     def test_parse_arguments(self):