diff --git a/frontend/src/lib/components/HandwriteCanvas.svelte b/frontend/src/lib/components/HandwriteCanvas.svelte
index 7488b6c..5f2e157 100644
--- a/frontend/src/lib/components/HandwriteCanvas.svelte
+++ b/frontend/src/lib/components/HandwriteCanvas.svelte
@@ -87,6 +87,19 @@
     coalesced: 0,
     lastType: '-',
     lastPressure: 0,
+    // pressure 파이프라인 진단 — raw → mapped → final.
+    // raw = PointerEvent.pressure 원본
+    // mapped = getStrokePressure 의 inputP (raw 매핑 또는 속도 fallback)
+    // final = fixedPressure update 후 perfect-freehand 에 전달되는 값
+    rawP: 0,
+    mappedP: 0,
+    finalP: 0,
+    tiltX: 0, tiltY: 0,
+    ptrW: 0, ptrH: 0,
+    buttons: 0,
+    // raw pressure 의 세션 min/max — 사용자가 펜 강약 시도 후 확인.
+    rawMin: 1,
+    rawMax: 0,
   });
   // dimension 측정 — button click 시 어느 element 의 dimension 이 변하는지 진단.
   let dimDbg = $state({ canW: 0, canH: 0, conW: 0, conH: 0 });
@@ -359,31 +372,39 @@
     // 1. inputP 결정.
     let inputP: number;
     if (Number.isFinite(rawPressure) && rawPressure > 0.1 && rawPressure < 0.99) {
-      // raw pressure 0.1~0.99 → 0.6~1.0 매핑. floor 보장.
       inputP = PRESSURE_FLOOR + ((rawPressure - 0.1) / 0.89) * (1 - PRESSURE_FLOOR);
     } else {
       const last = target.points[target.points.length - 1];
       if (last) {
         const dist = Math.hypot(x - last[0], y - last[1]);
-        // 속도 기반 0.6~1.0.
         inputP = Math.max(PRESSURE_FLOOR, Math.min(1.0, 1.6 - dist / 25));
       } else {
         inputP = FIRST_POINT_PRESSURE;
       }
     }
     // 2. fixed hybrid.
+    let finalP: number;
     if (target.fixedPressure === undefined) {
       target.fixedPressure = inputP;
-      return inputP;
+      finalP = inputP;
+    } else {
+      const dev = Math.abs(inputP - target.fixedPressure);
+      if (dev >= FIXED_LARGE) {
+        target.fixedPressure = inputP;
+        finalP = inputP;
+      } else {
+        const alpha = dev < FIXED_THRESHOLD ? FIXED_ALPHA_NOISE : FIXED_ALPHA_INTENT;
+        target.fixedPressure = target.fixedPressure + (inputP - target.fixedPressure) * alpha;
+        finalP = target.fixedPressure;
+      }
     }
-    const dev = Math.abs(inputP - target.fixedPressure);
-    if (dev >= FIXED_LARGE) {
-      target.fixedPressure = inputP;
-      return inputP;
+    // DBG: raw → mapped → final 3 단계 + raw min/max 추적.
+    if (DBG) {
+      const rawMin = Math.min(dbg.rawMin, rawPressure);
+      const rawMax = Math.max(dbg.rawMax, rawPressure);
+      dbg = { ...dbg, rawP: rawPressure, mappedP: inputP, finalP, rawMin, rawMax };
     }
-    const alpha = dev < FIXED_THRESHOLD ? FIXED_ALPHA_NOISE : FIXED_ALPHA_INTENT;
-    target.fixedPressure = target.fixedPressure + (inputP - target.fixedPressure) * alpha;
-    return target.fixedPressure;
+    return finalP;
   }
   function pushPointWithInterp(target: Stroke, x: number, y: number, p: number) {
     const last = target.points[target.points.length - 1];
@@ -514,7 +535,19 @@
   }
 
   function onPointerMove(e: PointerEvent) {
-    if (DBG) dbg = { ...dbg, move: dbg.move + 1, lastType: e.pointerType, lastPressure: e.pressure };
+    if (DBG) {
+      dbg = {
+        ...dbg,
+        move: dbg.move + 1,
+        lastType: e.pointerType,
+        lastPressure: e.pressure,
+        tiltX: e.tiltX ?? 0,
+        tiltY: e.tiltY ?? 0,
+        ptrW: e.width ?? 0,
+        ptrH: e.height ?? 0,
+        buttons: e.buttons,
+      };
+    }
 
     // 지우개 인디케이터 — hover (펜 미접촉) 만으로도 cursor 위치 추적. isDrawing
     // 가드 *전*이라 mouse hover / Pencil hover 모두 잡힘.
@@ -934,15 +967,17 @@
       <!-- 라이브 디버그 패널 — DEV 빌드 또는 prod 에서 ?debug=1 query 시 활성. -->
       <div class="absolute top-1 left-1 px-2 py-1 rounded bg-bg/90 text-[10px] text-dim font-mono pointer-events-none leading-tight">
         tool:{tool} width:{widthMode}<br/>
-        btn pen:{btnDbg.pen} er:{btnDbg.eraser} w:{btnDbg.width}<br/>
-        css:{cssWidth}×{cssHeight}<br/>
-        canvas:{dimDbg.canW}×{dimDbg.canH}<br/>
-        container:{dimDbg.conW}×{dimDbg.conH}<br/>
-        type:{dbg.lastType} p:{dbg.lastPressure.toFixed(2)}<br/>
+        type:{dbg.lastType} buttons:{dbg.buttons}<br/>
+        <span class="text-accent">PRESSURE PIPELINE</span><br/>
+        raw:{dbg.rawP.toFixed(3)} (min:{dbg.rawMin.toFixed(2)} max:{dbg.rawMax.toFixed(2)})<br/>
+        mapped:{dbg.mappedP.toFixed(3)} final:{dbg.finalP.toFixed(3)}<br/>
+        tilt:{dbg.tiltX},{dbg.tiltY} ptr:{dbg.ptrW}×{dbg.ptrH}<br/>
+        <span class="text-accent">EVENT COUNTERS</span><br/>
         down:{dbg.down} move:{dbg.move} up:{dbg.up} cancel:{dbg.cancel}<br/>
         rejType:{dbg.rejectedByType} rejId:{dbg.rejectedByPointerId} coal:{dbg.coalesced}<br/>
         drawing:{isDrawing ? 'Y' : 'N'} actId:{activePointerId ?? '-'} infPts:{inflight?.points.length ?? 0}<br/>
-        strokes:{strokes.length}
+        strokes:{strokes.length} btn pen:{btnDbg.pen} er:{btnDbg.eraser}<br/>
+        css:{cssWidth}×{cssHeight} canvas:{dimDbg.canW}×{dimDbg.canH}
       </div>
     {/if}
   </div>