diff --git a/src/components/Canvas/hooks/useKonvaTransformer.ts b/src/components/Canvas/hooks/useKonvaTransformer.ts
index e5b9ed91..3644277e 100644
--- a/src/components/Canvas/hooks/useKonvaTransformer.ts
+++ b/src/components/Canvas/hooks/useKonvaTransformer.ts
@@ -190,12 +190,18 @@ export function useKonvaTransformer({
   }, [selectedIds, selectedTypesKey, selectedSignature, stageRef, transformerRef]);
 
   const resizeEnabled = selectedIds.length <= 1;
+  const singleType =
+    selectedIds.length === 1
+      ? objects.find((o) => o.id === selectedIds[0])?.type ?? ""
+      : "";
   const enabledAnchors: string[] | undefined =
     selectedIds.length > 1
       ? []
-      : BARCODE_1D_TYPES.has(objects.find((o) => o.id === selectedIds[0])?.type ?? "")
-        ? ["top-center", "bottom-center"]
-        : undefined;
+      : ObjectRegistry[singleType]?.heightLocked
+        ? []
+        : BARCODE_1D_TYPES.has(singleType)
+          ? ["top-center", "bottom-center"]
+          : undefined;
   const isFreeResize = enabledAnchors === undefined;
 
   /** Reset all transform-time state. Idempotent; safe to call from any exit path. */
diff --git a/src/registry/barcode1d.tsx b/src/registry/barcode1d.tsx
index b5d0a693..88fa809a 100644
--- a/src/registry/barcode1d.tsx
+++ b/src/registry/barcode1d.tsx
@@ -2,6 +2,7 @@ import type { ObjectTypeDefinition, ObjectGroup, LabelObjectBase } from '../type
 import { useT } from '../lib/useT';
 import { inputCls, labelCls } from '../components/Properties/styles';
 import { fieldPos } from './zplHelpers';
+import { commitHeightTransform } from './transformHelpers';
 
 export interface Barcode1DProps {
   content: string;
@@ -29,6 +30,8 @@ interface Barcode1DConfig {
    * here ensures Labelary uses the same ratio as the canvas rendering.
    */
   byRatio?: number;
+  /** See {@link ObjectTypeDefinition.heightLocked}. */
+  heightLocked?: boolean;
 }
 
 interface BarcodeLocale {
@@ -53,10 +56,9 @@ export function createBarcode1D(config: Barcode1DConfig): ObjectTypeDefinition<B
       checkDigit: false,
     },
     defaultSize: { width: 300, height: 120 },
+    heightLocked: config.heightLocked,
 
-    commitTransform: (obj, { sy, snap }) => ({
-      height: Math.max(1, snap(Math.round(obj.props.height * sy))),
-    }),
+    commitTransform: config.heightLocked ? undefined : commitHeightTransform,
 
     toZPL: (obj: LabelObjectBase & { props: Barcode1DProps }) => {
       const p = obj.props;
@@ -95,6 +97,8 @@ export function createBarcode1D(config: Barcode1DConfig): ObjectTypeDefinition<B
               className={inputCls}
               value={p.height}
               min={1}
+              disabled={config.heightLocked}
+              readOnly={config.heightLocked}
               onChange={(e) => onChange({ height: Number(e.target.value) })}
             />
           </div>
diff --git a/src/registry/code128.tsx b/src/registry/code128.tsx
index e029b72c..dd3a8dd8 100644
--- a/src/registry/code128.tsx
+++ b/src/registry/code128.tsx
@@ -2,6 +2,7 @@ import type { ObjectTypeDefinition } from '../types/ObjectType';
 import { useT } from '../lib/useT';
 import { inputCls, labelCls } from '../components/Properties/styles';
 import { fieldPos } from './zplHelpers';
+import { commitHeightTransform } from './transformHelpers';
 
 export interface Code128Props {
   content: string;
@@ -24,6 +25,8 @@ export const code128: ObjectTypeDefinition<Code128Props> = {
   },
   defaultSize: { width: 300, height: 120 },
 
+  commitTransform: commitHeightTransform,
+
   toZPL: (obj) => {
     const p = obj.props;
     const interp = p.printInterpretation ? 'Y' : 'N';
diff --git a/src/registry/code39.tsx b/src/registry/code39.tsx
index a689a05c..78461428 100644
--- a/src/registry/code39.tsx
+++ b/src/registry/code39.tsx
@@ -2,6 +2,7 @@ import type { ObjectTypeDefinition } from '../types/ObjectType';
 import { useT } from '../lib/useT';
 import { inputCls, labelCls } from '../components/Properties/styles';
 import { fieldPos } from './zplHelpers';
+import { commitHeightTransform } from './transformHelpers';
 
 export interface Code39Props {
   content: string;
@@ -24,6 +25,8 @@ export const code39: ObjectTypeDefinition<Code39Props> = {
   },
   defaultSize: { width: 300, height: 120 },
 
+  commitTransform: commitHeightTransform,
+
   toZPL: (obj) => {
     const p = obj.props;
     const interp = p.printInterpretation ? 'Y' : 'N';
diff --git a/src/registry/ean13.tsx b/src/registry/ean13.tsx
index 42683bb9..cc0bd197 100644
--- a/src/registry/ean13.tsx
+++ b/src/registry/ean13.tsx
@@ -2,6 +2,7 @@ import type { ObjectTypeDefinition } from '../types/ObjectType';
 import { useT } from '../lib/useT';
 import { inputCls, labelCls } from '../components/Properties/styles';
 import { fieldPos } from './zplHelpers';
+import { commitHeightTransform } from './transformHelpers';
 
 export interface Ean13Props {
   content: string;        // 12 digits — ZPL appends the check digit automatically
@@ -22,6 +23,8 @@ export const ean13: ObjectTypeDefinition<Ean13Props> = {
   },
   defaultSize: { width: 300, height: 120 },
 
+  commitTransform: commitHeightTransform,
+
   toZPL: (obj) => {
     const p = obj.props;
     const interp = p.printInterpretation ? 'Y' : 'N';
diff --git a/src/registry/gs1databar.tsx b/src/registry/gs1databar.tsx
index d69d276a..7f96553b 100644
--- a/src/registry/gs1databar.tsx
+++ b/src/registry/gs1databar.tsx
@@ -8,6 +8,10 @@ export const gs1databar = createBarcode1D({
   hasCheckDigit: false,
   localeKey: "gs1databar",
   group: 'code-1d',
+  // GS1 Databar Omnidirectional has a symbology-fixed height; Zebra/Labelary
+  // ignore the ^BR height parameter for this variant. Disabling resize and the
+  // height input keeps the designer honest about what affects the print.
+  heightLocked: true,
   zplCommand: (p) => {
     // ^BR{orientation},{symbology},{magnification},{separator},{height},{segments}
     // symbology 1 = omnidirectional
diff --git a/src/registry/transformHelpers.ts b/src/registry/transformHelpers.ts
index f862ed40..2b786c13 100644
--- a/src/registry/transformHelpers.ts
+++ b/src/registry/transformHelpers.ts
@@ -22,6 +22,18 @@ export function commitWidthHeightTransform<P extends WidthHeightProps>(
   } as Partial<P>;
 }
 
+/** Shared commitTransform for 1D barcodes — only the bar height scales (width
+ *  is determined by content + module width, not by the resize anchor). */
+export function commitHeightTransform<P extends { height: number }>(
+  obj: LabelObjectBase & { props: P },
+  ctx: TransformContext,
+): Partial<P> {
+  const { sy, snap } = ctx;
+  return {
+    height: Math.max(1, snap(Math.round(obj.props.height * sy))),
+  } as Partial<P>;
+}
+
 interface Stacked2DProps {
   rowHeight: number;
   moduleWidth: number;
diff --git a/src/types/ObjectType.ts b/src/types/ObjectType.ts
index 9149b665..ddbfb71b 100644
--- a/src/types/ObjectType.ts
+++ b/src/types/ObjectType.ts
@@ -57,6 +57,13 @@ export interface ObjectTypeDefinition<P extends object = object> {
    * back to the model's top-left convention.
    */
   nodeOrigin?: 'center' | 'top-left';
+  /**
+   * True if the rendered height is fixed by the symbology spec rather than the
+   * `height` prop (e.g. GS1 Databar Omnidirectional). The transformer disables
+   * its height anchors and the properties panel renders the height input as
+   * read-only — both reflect that the value cannot influence the print output.
+   */
+  heightLocked?: boolean;
   toZPL: (obj: LabelObjectBase & { props: P }) => string;
   /**
    * Optional hook to enforce type-specific invariants on incoming changes