diff --git a/tools/OcrDaemon/Program.cs b/tools/OcrDaemon/Program.cs
index cb8cc2d..44d49aa 100644
--- a/tools/OcrDaemon/Program.cs
+++ b/tools/OcrDaemon/Program.cs
@@ -280,11 +280,25 @@ void HandleDiffOcr(Request req, TesseractEngine engine)
     int maxX = Math.Min(bestColEnd + pad, w - 1);
     int maxY = Math.Min(bestRowEnd + pad, h - 1);
 
-    // Trim 5px from left/right/bottom to remove tooltip border/shadow artifacts
-    int trim = 5;
-    minX = Math.Min(minX + trim, maxX);
-    maxX = Math.Max(maxX - trim, minX);
-    maxY = Math.Max(maxY - trim, minY);
+    // Dynamic right-edge trim: if the rightmost columns are much sparser than
+    // the tooltip body, trim them. This handles the ~5% of cases where ambient
+    // noise extends the detected region slightly on the right.
+    int colSpan = maxX - minX + 1;
+    if (colSpan > 100)
+    {
+        // Compute median column density in the middle 50% of the range
+        int q1 = minX + colSpan / 4;
+        int q3 = minX + colSpan * 3 / 4;
+        long midSum = 0;
+        int midCount = 0;
+        for (int x = q1; x <= q3; x++) { midSum += colCounts[x]; midCount++; }
+        double avgMidDensity = (double)midSum / midCount;
+        double cutoff = avgMidDensity * 0.3; // column must have >=30% of avg density
+
+        // Trim from right while below cutoff
+        while (maxX > minX + 100 && colCounts[maxX] < cutoff)
+            maxX--;
+    }
     int rw = maxX - minX + 1;
     int rh = maxY - minY + 1;