diff --git a/packages/form-core/src/FieldApi.ts b/packages/form-core/src/FieldApi.ts
index 337b38d8a..677dc51e1 100644
--- a/packages/form-core/src/FieldApi.ts
+++ b/packages/form-core/src/FieldApi.ts
@@ -302,6 +302,8 @@ export interface FieldOptions<
    * An optional object with default metadata for the field.
    */
   defaultMeta?: Partial<FieldMeta>
+
+  transformOnSubmit?: (value: TData) => unknown
 }
 
 /**
diff --git a/packages/form-core/src/FormApi.ts b/packages/form-core/src/FormApi.ts
index 017735b07..dfd55dca2 100644
--- a/packages/form-core/src/FormApi.ts
+++ b/packages/form-core/src/FormApi.ts
@@ -516,6 +516,26 @@ export class FormApi<
     )
   }
 
+  applyFieldsTransformation = () => {
+    this.store.batch(() => {
+      void (
+        Object.values(this.fieldInfo) as FieldInfo<any, TFormValidator>[]
+      ).forEach((field) => {
+        if (!field.instance) return
+        const fieldInstance = field.instance
+
+        // Apply transformation
+        const transformOnSubmit = fieldInstance.options.transformOnSubmit
+        if (!transformOnSubmit) return
+
+        const transformedValue = transformOnSubmit(field.instance.getValue())
+        if (!transformedValue) return
+
+        fieldInstance.setValue(transformedValue)
+      })
+    })
+  }
+
   /**
    * Validates all fields in the form using the correct handlers for a given validation type.
    */
@@ -810,6 +830,9 @@ export class FormApi<
     }
 
     try {
+      // Apply transformOnSubmit function
+      this.applyFieldsTransformation()
+
       // Run the submit code
       await this.options.onSubmit?.({ value: this.state.values, formApi: this })
 
diff --git a/packages/form-core/tests/FieldApi.spec.ts b/packages/form-core/tests/FieldApi.spec.ts
index 56a415b19..d30a4bfbc 100644
--- a/packages/form-core/tests/FieldApi.spec.ts
+++ b/packages/form-core/tests/FieldApi.spec.ts
@@ -1329,4 +1329,24 @@ describe('field api', () => {
       'other validation error',
     )
   })
+
+  it('should apply field transformation on submit', async () => {
+    const form = new FormApi({
+      defaultValues: {
+        id: '1',
+      },
+    })
+
+    const field = new FieldApi({
+      form,
+      name: 'id',
+      transformOnSubmit: (v) => parseInt(v),
+    })
+
+    field.mount()
+
+    expect(field.getValue()).toBe('1')
+    await form.handleSubmit()
+    expect(field.getValue()).toBe(1)
+  })
 })