diff --git a/src/options.ts b/src/options.ts
index 23dfe325..277717a1 100644
--- a/src/options.ts
+++ b/src/options.ts
@@ -431,7 +431,7 @@ function invidiousInstanceAddInit(element: HTMLElement, option: string) {
             let instanceList = Config.config[option];
             if (!instanceList) instanceList = [];
 
-            instanceList.push(textBox.value);
+            instanceList.push(textBox.value.trim().toLowerCase());
 
             Config.config[option] = instanceList;