diff --git a/src/ai_typewriter/config.py b/src/ai_typewriter/config.py
index f661699..55d7e3f 100644
--- a/src/ai_typewriter/config.py
+++ b/src/ai_typewriter/config.py
@@ -6,6 +6,7 @@ from pathlib import Path
 from typing import Any, Literal
 
 Provider = Literal["ollama", "gemini"]
+MathTextFormat = Literal["plain", "unicode", "unicode_math"]
 
 
 @dataclass(frozen=True)
@@ -18,6 +19,7 @@ class AppConfig:
     request_timeout_seconds: float | None = 300.0
     copy_wait_seconds: float = 1.0
     type_delay_seconds: float = 0.0
+    math_text_format: MathTextFormat = "unicode"
     restore_clipboard: bool = True
     system_prompt: str = (
         "Réponds directement et de manière ultra-concise. "
@@ -40,6 +42,13 @@ def _coerce_timeout(value: Any) -> float | None:
     return timeout
 
 
+def _coerce_math_text_format(value: Any) -> MathTextFormat:
+    mode = str(value or "unicode").lower().strip()
+    if mode not in {"plain", "unicode", "unicode_math"}:
+        raise ValueError("config.math_text_format doit être 'plain' ou 'unicode'")
+    return mode  # type: ignore[return-value]
+
+
 def load_config(path: str | Path = "config.json") -> AppConfig:
     cfg_path = Path(path)
     if not cfg_path.exists():
@@ -56,6 +65,7 @@ def load_config(path: str | Path = "config.json") -> AppConfig:
         request_timeout_seconds=_coerce_timeout(data.get("request_timeout_seconds", 300)),
         copy_wait_seconds=float(data.get("copy_wait_seconds", 1)),
         type_delay_seconds=float(data.get("type_delay_seconds", 0)),
+        math_text_format=_coerce_math_text_format(data.get("math_text_format", "unicode")),
         restore_clipboard=bool(data.get("restore_clipboard", True)),
         system_prompt=str(data.get("system_prompt", AppConfig.system_prompt)),
     )