diff --git a/shared_data/vocabulary.json b/shared_data/vocabulary.json
index 7f20204..912b68e 100644
--- a/shared_data/vocabulary.json
+++ b/shared_data/vocabulary.json
@@ -62,6 +62,10 @@
     {
       "from": "Kashi",
       "to": "Cachy"
+    },
+    {
+      "from": "SHP",
+      "to": "SAP"
     }
   ]
 }
\ No newline at end of file
diff --git a/whisper-dictation.spec b/whisper-dictation.spec
index 9342827..8b966cc 100644
--- a/whisper-dictation.spec
+++ b/whisper-dictation.spec
@@ -34,6 +34,7 @@ _hiddenimports = [
     'ctranslate2',
     'faster_whisper',
     'sounddevice',
+    'language_tool_python',
 ]
 if _is_windows:
     _hiddenimports.append('pynput.keyboard._win32')
diff --git a/whisper_app/config.py b/whisper_app/config.py
index 4173da9..9b4aa30 100644
--- a/whisper_app/config.py
+++ b/whisper_app/config.py
@@ -35,6 +35,7 @@ DEFAULT_CONFIG = {
     "sample_rate": 16000,
     "vocab_path": "",
     "model_dir": "",
+    "grammar_check": True,
 }
 
 MODELS = ["tiny", "base", "small", "medium", "large-v2", "large-v3"]
@@ -115,6 +116,23 @@ def apply_vocab(text: str) -> str:
     return text
 
 
+_STYLE_HINTS = {
+    "de": "Hallo, wie geht es Ihnen? Ich arbeite an einem wichtigen Projekt. "
+          "Die Ergebnisse der Analyse zeigen deutliche Verbesserungen.",
+    "en": "Hello, how are you? I am working on an important project. "
+          "The analysis results show clear improvements.",
+    "fr": "Bonjour, comment allez-vous ? Je travaille sur un projet important. "
+          "Les résultats de l'analyse montrent des améliorations nettes.",
+}
+
+
 def get_initial_prompt() -> str:
+    parts = []
+    lang = config.get("language")
+    hint = _STYLE_HINTS.get(lang)
+    if hint:
+        parts.append(hint)
     words = vocab.get("words", [])
-    return ", ".join(words) if words else ""
+    if words:
+        parts.append(", ".join(words))
+    return " ".join(parts) if parts else ""
diff --git a/whisper_app/grammar.py b/whisper_app/grammar.py
new file mode 100644
index 0000000..f846d68
--- /dev/null
+++ b/whisper_app/grammar.py
@@ -0,0 +1,41 @@
+"""Optional grammar correction using LanguageTool."""
+
+_tool = None
+_lang = None
+
+_LANG_MAP = {
+    "de": "de-DE",
+    "en": "en-US",
+    "fr": "fr-FR",
+    "es": "es",
+    "it": "it",
+}
+
+
+def init(lang, log=print):
+    """Pre-initialize LanguageTool. Call once at startup."""
+    global _tool, _lang
+    if lang == _lang and _tool is not None:
+        return
+    _lang = lang
+    try:
+        import language_tool_python
+        lt_lang = _LANG_MAP.get(lang, lang or "de-DE")
+        _tool = language_tool_python.LanguageTool(lt_lang)
+        log("Grammar checker ready.")
+    except ImportError:
+        _tool = None
+        log("language_tool_python not installed — grammar check disabled.")
+    except Exception as e:
+        _tool = None
+        log(f"Grammar checker init failed: {e}")
+
+
+def correct(text):
+    """Correct grammar, capitalization, and punctuation."""
+    if _tool is None:
+        return text
+    try:
+        return _tool.correct(text)
+    except Exception:
+        return text
diff --git a/whisper_app/settings_window.py b/whisper_app/settings_window.py
index c58db58..e301ca9 100644
--- a/whisper_app/settings_window.py
+++ b/whisper_app/settings_window.py
@@ -158,6 +158,15 @@ def _open_main(root: tk.Tk, on_reload) -> None:
     f = row("Sprache")
     dd(f, lang_var, list(cfg.LANGUAGES.keys()), 14).pack(side="left")
 
+    # ── TEXTVERARBEITUNG ──
+    section("TEXTVERARBEITUNG")
+    grammar_var = tk.BooleanVar(value=cfg.config.get("grammar_check", True))
+    f_gc = row("Grammatikkorrektur", hint="pip install language_tool_python")
+    tk.Checkbutton(f_gc, variable=grammar_var, text="Aktiviert",
+                   bg=BG, fg=FG, selectcolor=BG3, activebackground=BG,
+                   activeforeground=FG, font=FONT_UI,
+                   highlightthickness=0, bd=0).pack(side="left")
+
     # ── LEISTUNG ──
     section("LEISTUNG")
     device_var = tk.StringVar(value=cfg.config["device"])
@@ -232,6 +241,7 @@ def _open_main(root: tk.Tk, on_reload) -> None:
         cfg.config["hotkey"] = hotkey_var.get()
         cfg.config["vocab_path"] = vocab_path_var.get()
         cfg.config["model_dir"] = model_dir_var.get()
+        cfg.config["grammar_check"] = grammar_var.get()
         cfg.save_config()
         win.destroy()
         threading.Thread(target=on_reload, daemon=True).start()
diff --git a/whisper_app/transcriber.py b/whisper_app/transcriber.py
index a2dda20..26f101e 100644
--- a/whisper_app/transcriber.py
+++ b/whisper_app/transcriber.py
@@ -3,7 +3,7 @@ import time
 import numpy as np
 from faster_whisper import WhisperModel
 
-from whisper_app import app, config, typer
+from whisper_app import app, config, grammar, typer
 
 
 def load_model() -> None:
@@ -16,6 +16,8 @@ def load_model() -> None:
         download_root=model_dir,
     )
     app.log("Model ready.")
+    if config.config.get("grammar_check"):
+        grammar.init(config.config.get("language") or "de", log=app.log)
 
 
 def stop_and_transcribe() -> None:
@@ -62,6 +64,8 @@ def _do_transcribe() -> None:
     )
     text = " ".join(s.text for s in segments).strip()
     text = config.apply_vocab(text)
+    if config.config.get("grammar_check"):
+        text = grammar.correct(text)
     app.log(f"Result: {repr(text)}")
 
     if text:
diff --git a/whisper_app/typer.py b/whisper_app/typer.py
index ad1ff58..aa211fb 100644
--- a/whisper_app/typer.py
+++ b/whisper_app/typer.py
@@ -9,6 +9,31 @@ def _pynput_type(text):
     KeyboardController().type(text)
 
 
+def _wl_paste():
+    """Read current clipboard contents, returns None on failure."""
+    try:
+        result = subprocess.run(
+            ["wl-paste", "--no-newline"],
+            capture_output=True, timeout=2,
+        )
+        if result.returncode == 0:
+            return result.stdout
+    except (subprocess.TimeoutExpired, FileNotFoundError):
+        pass
+    return None
+
+
+def _wl_copy_bytes(data):
+    """Restore clipboard from raw bytes."""
+    try:
+        subprocess.run(
+            ["wl-copy"],
+            input=data, check=False, timeout=2,
+        )
+    except (subprocess.TimeoutExpired, FileNotFoundError):
+        pass
+
+
 def type_text(text):
     """Type text into the active window, cross-platform."""
     if os.name == "nt":
@@ -16,9 +41,13 @@ def type_text(text):
         return
     session = os.environ.get("XDG_SESSION_TYPE", "")
     if session == "wayland" and shutil.which("wl-copy"):
+        old_clipboard = _wl_paste()
         subprocess.run(["wl-copy", "--", text], check=False)
         time.sleep(0.05)
         subprocess.run(["xdotool", "key", "ctrl+v"], check=False)
+        time.sleep(0.05)
+        if old_clipboard is not None:
+            _wl_copy_bytes(old_clipboard)
     elif shutil.which("xdotool"):
         subprocess.run(["xdotool", "type", "--clearmodifiers", "--", text], check=False)
     else: