diff --git a/packages/svelte-form/src/createForm.svelte.ts b/packages/svelte-form/src/createForm.svelte.ts
index 1b40ce748f..bf75b4a96c 100644
--- a/packages/svelte-form/src/createForm.svelte.ts
+++ b/packages/svelte-form/src/createForm.svelte.ts
@@ -1,6 +1,19 @@
 import { FormApi } from '@tanstack/form-core'
 import { useSelector } from '@tanstack/svelte-store'
-import { onMount } from 'svelte'
+import { getContext, hasContext, onMount, setContext } from 'svelte'
+
+const FORM_ID_CTX = Symbol()
+
+function nextFormId(): string {
+  try {
+    if (!hasContext(FORM_ID_CTX)) setContext(FORM_ID_CTX, { n: 0 })
+    const ctx = getContext<{ n: number }>(FORM_ID_CTX)
+    return `svelte-form-${++ctx.n}`
+  } catch {
+    // Outside component context (unit tests, etc.)
+    return `svelte-form-${Math.random().toString(36).slice(2, 9)}`
+  }
+}
 import Field from './Field.svelte'
 import FormGroup from './FormGroup.svelte'
 import Subscribe from './Subscribe.svelte'
@@ -310,7 +323,7 @@ export function createForm<
     TFormOnDynamicAsync,
     TFormOnServer,
     TSubmitMeta
-  >(options)
+  >({ ...options, formId: options?.formId ?? nextFormId() } as typeof options)
   const extendedApi: typeof api &
     SvelteFormApi<
       TParentData,