diff --git a/hassio/src/components/hassio-upload-snapshot.ts b/hassio/src/components/hassio-upload-snapshot.ts
index 5740e0621e..834281d911 100644
--- a/hassio/src/components/hassio-upload-snapshot.ts
+++ b/hassio/src/components/hassio-upload-snapshot.ts
@@ -27,6 +27,8 @@ declare global {
   }
 }
 
+const MAX_FILE_SIZE = 1 * 1024 * 1024 * 1024; // 1GB
+
 @customElement("hassio-upload-snapshot")
 export class HassioUploadSnapshot extends LitElement {
   public hass!: HomeAssistant;
@@ -51,6 +53,20 @@ export class HassioUploadSnapshot extends LitElement {
   private async _uploadFile(ev) {
     const file = ev.detail.files[0];
 
+    if (file.size > MAX_FILE_SIZE) {
+      showAlertDialog(this, {
+        title: "Snapshot file is too big",
+        text: html`The maximum allowed filesize is 1GB.<br />
+          <a
+            href="https://www.home-assistant.io/hassio/haos_common_tasks/#restoring-a-snapshot-on-a-new-install"
+            target="_blank"
+            >Have a look here on how to restore it.</a
+          >`,
+        confirmText: "ok",
+      });
+      return;
+    }
+
     if (!["application/x-tar"].includes(file.type)) {
       showAlertDialog(this, {
         title: "Unsupported file format",