diff --git a/src/components/create.vue b/src/components/create.vue
index db9ded2..3bc87f4 100644
--- a/src/components/create.vue
+++ b/src/components/create.vue
@@ -116,6 +116,8 @@ const defaultExpiryChoices = [
   5 * 60, // 5 minutes
 ]
 
+const internalMaxFileSize = 64 * 1024 * 1024 // 64 MiB
+
 const passwordCharset = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
 const passwordLength = 20
 
@@ -146,7 +148,7 @@ export default {
     },
 
     maxFileSizeExceeded() {
-      return this.$root.customize.maxAttachmentSizeTotal !== 0 && this.fileSize > this.$root.customize.maxAttachmentSizeTotal
+      return this.fileSize > internalMaxFileSize || this.$root.customize.maxAttachmentSizeTotal !== 0 && this.fileSize > this.$root.customize.maxAttachmentSizeTotal
     },
   },