diff --git a/src/routes/guestbook/+page.server.ts b/src/routes/guestbook/+page.server.ts
index f75fd94..deb793a 100644
--- a/src/routes/guestbook/+page.server.ts
+++ b/src/routes/guestbook/+page.server.ts
@@ -26,7 +26,7 @@ const postAction = (client: any, scopes: string[]) => {
     return async ({ request, cookies }: { request: Request, cookies: Cookies }) => {
         const form = await request.formData()
         const author = form.get("author")?.toString().replace(/([^_a-z0-9]+)/gi, '')
-        const content = form.get("content")?.toString()
+        const content = form.get("content")?.toString().substring(0, 512)
         const scopedCookies = scopeCookies(cookies)
         if (author === undefined || content === undefined) {
             scopedCookies.set("sendError", "one of author or content fields are missing")
diff --git a/src/routes/guestbook/+page.svelte b/src/routes/guestbook/+page.svelte
index 50b96be..4a106bf 100644
--- a/src/routes/guestbook/+page.svelte
+++ b/src/routes/guestbook/+page.svelte
@@ -30,6 +30,7 @@
 						class="text-lg ml-0.5 bg-inherit resize-none text-shadow-white placeholder-shown:[text-shadow:none] [field-sizing:content]"
 						name="content"
 						placeholder="say meow!"
+						maxlength="512"
 						required
 					/>
 					<p class="place-self-end text-sm font-monospace">