diff --git a/src/validate.js b/src/validate.js
index 1f945e6..579b898 100644
--- a/src/validate.js
+++ b/src/validate.js
@@ -24,6 +24,8 @@ const GENERIC_DEFAULT_WIDTH = 160;
 const GENERIC_MIN_HEIGHT = 120;
 const GENERIC_PIN_STEP = 18;
 const TEMPLATE_PIN_STEP = 24;
+const MIN_SYMBOL_WIDTH = 96;
+const MIN_SYMBOL_HEIGHT = 64;
 
 const TEMPLATE_DEFS = {
   resistor: {
@@ -230,6 +232,90 @@ function pinCountToHeight(pinCount) {
   return Math.max(GENERIC_MIN_HEIGHT, rows * GENERIC_PIN_STEP);
 }
 
+function toNumericOffset(value, fallback) {
+  const n = Number(value);
+  return Number.isFinite(n) ? n : fallback;
+}
+
+function normalizeSymbolGeometry(sym, id, issues) {
+  if (!sym || typeof sym !== "object" || !Array.isArray(sym.pins) || sym.pins.length === 0) {
+    return;
+  }
+
+  const pinStep = hasTemplateName(sym) ? TEMPLATE_PIN_STEP : GENERIC_PIN_STEP;
+  const margin = pinStep;
+  const sideOrder = ["left", "right", "top", "bottom"];
+  const sideBuckets = new Map(sideOrder.map((side) => [side, []]));
+
+  for (const pin of sym.pins) {
+    const side = sideBuckets.has(pin.side) ? pin.side : "left";
+    sideBuckets.get(side).push(pin);
+  }
+
+  let changedOffsets = false;
+  for (const side of sideOrder) {
+    const pins = sideBuckets.get(side);
+    pins.sort((a, b) => {
+      const ao = toNumericOffset(a.offset, margin);
+      const bo = toNumericOffset(b.offset, margin);
+      if (ao !== bo) return ao - bo;
+      return String(a.name ?? "").localeCompare(String(b.name ?? ""));
+    });
+
+    let next = margin;
+    for (const pin of pins) {
+      const current = toNumericOffset(pin.offset, next);
+      const normalized = Math.max(next, current);
+      if (pin.offset !== normalized) {
+        pin.offset = normalized;
+        changedOffsets = true;
+      }
+      next = normalized + pinStep;
+    }
+  }
+
+  const maxVerticalOffset = Math.max(
+    margin,
+    ...[...(sideBuckets.get("left") ?? []), ...(sideBuckets.get("right") ?? [])].map((pin) =>
+      toNumericOffset(pin.offset, margin)
+    )
+  );
+  const maxHorizontalOffset = Math.max(
+    margin,
+    ...[...(sideBuckets.get("top") ?? []), ...(sideBuckets.get("bottom") ?? [])].map((pin) =>
+      toNumericOffset(pin.offset, margin)
+    )
+  );
+
+  const requiredHeight = Math.max(MIN_SYMBOL_HEIGHT, maxVerticalOffset + margin);
+  const requiredWidth = Math.max(MIN_SYMBOL_WIDTH, maxHorizontalOffset + margin);
+
+  sym.body = sym.body ?? {};
+  const beforeWidth = toNumericOffset(sym.body.width, MIN_SYMBOL_WIDTH);
+  const beforeHeight = toNumericOffset(sym.body.height, MIN_SYMBOL_HEIGHT);
+  const nextWidth = Math.max(beforeWidth, requiredWidth);
+  const nextHeight = Math.max(beforeHeight, requiredHeight);
+  sym.body.width = nextWidth;
+  sym.body.height = nextHeight;
+
+  const desiredPinOrder = sideOrder.flatMap((side) => sideBuckets.get(side) ?? []);
+  const changedOrder =
+    desiredPinOrder.length === sym.pins.length &&
+    desiredPinOrder.some((pin, index) => pin !== sym.pins[index]);
+  if (changedOrder) {
+    sym.pins = desiredPinOrder;
+  }
+
+  if (changedOffsets || nextWidth !== beforeWidth || nextHeight !== beforeHeight || changedOrder) {
+    issues.push({
+      code: "symbol_geometry_adjusted",
+      message: `Adjusted symbol '${id}' geometry/pin spacing for readability.`,
+      severity: "warning",
+      path: `symbols.${id}`
+    });
+  }
+}
+
 function buildPinsFromUsage(ref, pinUsage) {
   const names = [...pinUsage.values()].map((x) => x.pin).sort((a, b) => a.localeCompare(b));
   if (!names.length) {
@@ -467,6 +553,12 @@ function ensureGenericSymbols(model, issues, enableGenericSymbols) {
     }
   }
 
+  for (const [id, sym] of Object.entries(next.symbols)) {
+    if (isGenericSymbol(sym) || hasTemplateName(sym)) {
+      normalizeSymbolGeometry(sym, id, issues);
+    }
+  }
+
   for (const net of next.nets ?? []) {
     for (const node of net.nodes ?? []) {
       const inst = (next.instances ?? []).find((x) => x.ref === node.ref);
diff --git a/tests/validate.test.js b/tests/validate.test.js
new file mode 100644
index 0000000..465a2e8
--- /dev/null
+++ b/tests/validate.test.js
@@ -0,0 +1,58 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { validateModel } from "../src/validate.js";
+
+test("validate normalizes dense symbol pin spacing and body size deterministically", () => {
+  const model = {
+    meta: { title: "Dense symbol test" },
+    symbols: {
+      dense: {
+        symbol_id: "dense",
+        category: "generic",
+        body: { width: 80, height: 40 },
+        pins: [
+          { name: "A", number: "1", side: "left", offset: 4, type: "input" },
+          { name: "B", number: "2", side: "left", offset: 6, type: "input" },
+          { name: "Y", number: "3", side: "right", offset: 5, type: "output" },
+          { name: "Z", number: "4", side: "right", offset: 7, type: "output" }
+        ]
+      }
+    },
+    instances: [{ ref: "U1", symbol: "dense", placement: { x: 100, y: 100, rotation: 0, locked: false } }],
+    nets: [
+      {
+        name: "N1",
+        class: "signal",
+        nodes: [
+          { ref: "U1", pin: "A" },
+          { ref: "U1", pin: "Y" }
+        ]
+      },
+      {
+        name: "N2",
+        class: "signal",
+        nodes: [
+          { ref: "U1", pin: "B" },
+          { ref: "U1", pin: "Z" }
+        ]
+      }
+    ]
+  };
+
+  const first = validateModel(model);
+  assert.ok(first.model);
+  const dense = first.model.symbols.dense;
+  assert.ok(dense.body.width >= 96);
+  assert.ok(dense.body.height >= 64);
+
+  const leftPins = dense.pins.filter((pin) => pin.side === "left");
+  const rightPins = dense.pins.filter((pin) => pin.side === "right");
+  assert.ok(leftPins[1].offset - leftPins[0].offset >= 18);
+  assert.ok(rightPins[1].offset - rightPins[0].offset >= 18);
+
+  assert.ok(first.issues.some((issue) => issue.code === "symbol_geometry_adjusted"));
+
+  const second = validateModel(first.model);
+  assert.ok(second.model);
+  assert.deepEqual(second.model.symbols.dense, first.model.symbols.dense);
+});