diff --git a/tgbot/kollagen-bot/main.py b/tgbot/kollagen-bot/main.py
index 8bb26b7..ba3826f 100644
--- a/tgbot/kollagen-bot/main.py
+++ b/tgbot/kollagen-bot/main.py
@@ -2,18 +2,22 @@ from genericpath import isdir
 import logging
 import os
 import subprocess
-from typing import Optional
+from typing import List, Optional
 import re
 
+
 from tempfile import NamedTemporaryFile
 
-from telegram import Update, ForceReply
+from telegram import Update
 from telegram.ext import (
     Updater,
     CommandHandler,
     DictPersistence,
     CallbackContext,
+    defaults,
 )
+from telegram.parsemode import ParseMode
+from parser import SafeArgumentParser, safe_str
 
 
 class KollagenBot:
@@ -24,26 +28,78 @@ class KollagenBot:
         self.kollagen_path = kollagen_path
         self.base_dir = base_dir
 
-        self.updater = Updater(tg_token, persistence=DictPersistence(user_data_json="{}"))
+        self._init_parser()
+
+        self.updater = Updater(
+            tg_token, persistence=DictPersistence(user_data_json="{}")
+        )
 
         dispatcher = self.updater.dispatcher
 
         dispatcher.add_handler(CommandHandler("start", self.tg_start))
-        dispatcher.add_handler(CommandHandler("list_modes", self.tg_list_modes))
+        dispatcher.add_handler(CommandHandler("help", self.tg_help))
         dispatcher.add_handler(CommandHandler("generate", self.tg_generate))
         dispatcher.add_handler(CommandHandler("g", self.tg_generate))
         dispatcher.add_handler(CommandHandler("regenerate", self.tg_regenerate))
         dispatcher.add_handler(CommandHandler("r", self.tg_regenerate))
         dispatcher.add_error_handler(self.tg_error)
 
+    def _init_parser(self):
+        parser = SafeArgumentParser(prog="/generate", add_help=False)
+        parser.add_argument(
+            "directories",
+            metavar="dir",
+            type=safe_str,
+            nargs="*",
+            default=[self.base_dir] if self.base_dir else [],
+            help="Directories to process. By default, the entire directory is processed.",
+        )
+        parser.add_argument(
+            "-m",
+            dest="mode",
+            metavar="mode",
+            choices=self._get_modes(),
+            nargs="?",
+            const=True,
+            help=f"Which collage mode to use. By default, one is chosen at random. When no value is specified, all modes are listed.",
+        )
+        parser.add_argument(
+            "-n",
+            dest="num_images",
+            metavar="N",
+            type=int,
+            help=f"How many images to have in a collage. Random (2<n<5) by default.",
+        )
+        parser.add_argument(
+            "-w",
+            dest="width",
+            type=int,
+            default=640,
+            help=f"Width of resulting output (in px). 640px by default.",
+        )
+        parser.add_argument(
+            "-h",
+            dest="height",
+            type=int,
+            default=640,
+            help=f"Height of resulting output (in px). 640px by default.",
+        )
+        self.parser = parser
+
+    def _get_modes(self):
+        modes = subprocess.run(
+            [self.kollagen_path, "-m"], check=True, capture_output=True
+        )
+        return modes.stdout.decode("utf-8").strip().split(", ")
+
     def tg_start(self, update: Update, context: CallbackContext):
         update.message.reply_text("Hi! Check out https://gitlab.com/tmladek/kollagen")
-        self._process("", update)
+        self._process([], update)
 
     def tg_generate(self, update: Update, context: CallbackContext):
         cmd_line = update.message.text.split(" ")[1:]
-        self._process(cmd_line, update)
-        if context.user_data is not None:
+        success = self._process(cmd_line, update)
+        if success and context.user_data is not None:
             context.user_data["last_cmd_line"] = cmd_line
 
     def tg_regenerate(self, update: Update, context: CallbackContext):
@@ -52,31 +108,56 @@ class KollagenBot:
         else:
             update.message.reply_text("No previous command to regenerate!")
 
-    def _process(self, cmd_line: str, update: Update):
+    def _process(self, cmd_line: List[str], update: Update):
         self.logger.info(
             f"Generating from {update.effective_user}, with cmd_line: `{cmd_line}`"
         )
+        args = self.parser.parse_args(cmd_line)
+
+        if args.mode is True:
+            update.message.reply_text(
+                f"Available modes: {', '.join(self._get_modes())}"
+            )
+            return False
+
         directories = [
-            os.path.join(self.base_dir or "./", re.sub(r"[^a-zA-Z0-9]", "", arg))
-            for arg in cmd_line
+            os.path.join(self.base_dir or "./", dir) for dir in args.directories
         ]
-        directories = [dir for dir in directories if os.path.isdir(dir)]
-        if len(directories) == 0 and self.base_dir:
-            directories = [self.base_dir]
+
+        mode = ["-m", args.mode] if args.mode else []
+        num_images = ["-n", args.num_images] if args.num_images else []
+
         with NamedTemporaryFile(suffix=".png") as ntf:
+            self.logger.debug(
+                f"Running: "
+                + str(
+                    [
+                        self.kollagen_path,
+                        "-r",
+                        *directories,
+                        "-w",
+                        args.width,
+                        "-h",
+                        args.height,
+                        *mode,
+                        "-o",
+                        ntf.name,
+                    ]
+                )
+            )
             subprocess.run(
-                [self.kollagen_path, "-r", *directories, "-o", ntf.name],
+                [self.kollagen_path, "-r", *directories, *mode, "-o", ntf.name],
                 check=True,
                 capture_output=True,
             )
             ntf.seek(0)
             update.message.reply_photo(ntf)
+            return True
 
-    def tg_list_modes(self, update: Update, context: CallbackContext):
-        modes = subprocess.run(
-            [self.kollagen_path, "-m"], check=True, capture_output=True
+    def tg_help(self, update: Update, context: CallbackContext):
+        update.message.reply_text(
+            f"```{self.parser.format_help()}```", parse_mode=ParseMode.MARKDOWN
         )
-        update.message.reply_text(f"Available modes: {modes.stdout.decode('utf-8')}")
 
     def tg_error(self, update: object, context: CallbackContext) -> None:
         self.logger.error(
@@ -99,7 +180,7 @@ class KollagenBot:
 def main() -> None:
     logging.basicConfig(
         format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
-        level=logging.INFO,
+        level=getattr(logging, os.getenv("LOG_LEVEL", "info").upper()),
     )
 
     tg_token = os.getenv("TG_TOKEN")
diff --git a/tgbot/kollagen-bot/parser.py b/tgbot/kollagen-bot/parser.py
new file mode 100644
index 0000000..ac5556b
--- /dev/null
+++ b/tgbot/kollagen-bot/parser.py
@@ -0,0 +1,16 @@
+import argparse
+import re
+
+
+class ArgumentParserError(RuntimeError):
+    pass
+
+
+class SafeArgumentParser(argparse.ArgumentParser):
+    def error(self, message):
+        raise ArgumentParserError(message)
+
+def safe_str(val: str):
+    if re.findall(r'[^\w]', val):
+        raise RuntimeError("No special characters in arguments allowed!")
+    return val
\ No newline at end of file