diff --git a/.gitignore b/.gitignore
index 10734fa..913e49c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
 __pycache__
 *.exe
+*.spec
diff --git a/CreateExe.bat b/CreateExe.bat
index 0d0ede4..6b1fee3 100644
--- a/CreateExe.bat
+++ b/CreateExe.bat
@@ -4,4 +4,5 @@ pyinstaller ^
     --console ^
     --icon "NONE" ^
     --name "WinziPrint" ^
+    --clean ^
     src/winziprint.py
diff --git a/src/winziprint.py b/src/winziprint.py
index 994ae9e..bfffd21 100755
--- a/src/winziprint.py
+++ b/src/winziprint.py
@@ -11,16 +11,19 @@ import socketserver
 import io
 import signal
 import math
+import threading
 
 import weasyprint
 import pypdf
 
 
-VERSION = __version__ = '0.2.9'
+VERSION = __version__ = '0.3.0'
 SOCKET_ADDRESS = ('127.0.0.1', 30983)
 
 BATCH_SIZE = 10
 
+RUNNING: dict[int, bool] = {}
+
 
 def convert_part(output_file: str, batch: list[str], step_cb: Callable, encoding: str = None) -> list[int]:
     documents = []
@@ -55,6 +58,8 @@ def convert(input_files: list[str],
     steps = [0]
 
     def next_step() -> None:
+        if not RUNNING[threading.get_ident()]:
+            raise InterruptedError('aborted')
         steps[0] += 1
         if progress:
             print(f'progress: {steps[0]}/{total_steps}', file=out, flush=True)
@@ -233,12 +238,23 @@ def _get_arg(args: list[str], n1: str, n2: str = None, flag: bool = False) -> No
 class ConnectionHandler(socketserver.StreamRequestHandler):
     def handle(self):
         try:
-            while True:
-                out = io.TextIOWrapper(self.wfile, encoding='utf-8')
-                for line in io.TextIOWrapper(self.rfile, encoding='utf-8'):
-                    _wrapper_convert(line.strip().split(';'), out=out)
-        except ValueError:
+            out = io.TextIOWrapper(self.wfile, encoding='utf-8')
+            RUNNING[threading.get_ident()] = True
+            print(f'id: {threading.get_ident()}', file=out, flush=True)
+            for line in io.TextIOWrapper(self.rfile, encoding='utf-8'):
+                if not RUNNING[threading.get_ident()]:
+                    print(f'error: aborted', file=out, flush=True)
+                    break
+                parts = line.strip().split(';')
+                if len(parts) == 2 and parts[0] == 'cancel':
+                    thread_id = int(parts[1].strip())
+                    RUNNING[thread_id] = False
+                    continue
+                _wrapper_convert(parts, out=out)
+        except (ValueError, ConnectionError):
             pass  # socket closed by client
+        finally:
+            del RUNNING[threading.get_ident()]
 
 
 def main() -> None: