diff --git a/frontend/ts/dom/flags.ts b/frontend/ts/dom/flags.ts
new file mode 100644
index 00000000..d3a31f6c
--- /dev/null
+++ b/frontend/ts/dom/flags.ts
@@ -0,0 +1,36 @@
+import path from "path";
+
+import { $qr } from "./qr";
+
+function updateFlagPreview($sel: JQuery<HTMLSelectElement>) {
+	const $preview = $sel.next("img");
+	let val = $sel.val() as string;
+	if(val === "" || val === "geoip") {
+		val = "blank.gif";
+	}
+	$preview.attr("src", path.join(webroot || "/", "static/flags", val));
+}
+
+function setupQRFlags($flags: JQuery<HTMLSelectElement>) {
+	if(!$qr) return;
+	$qr.find("div#qrbuttons").before(
+		$("<div/>").append(
+			$flags.clone(true, true).attr("id", "qrpost-flag"),
+			$("<img/>").addClass("flag-preview")
+				.attr("src", path.join(webroot || "/", "static/flags/blank.gif"))
+		)
+	);
+}
+
+
+export function initFlags() {
+	const $flagChanger = $<HTMLSelectElement>("select")
+		.filter((_, el) => el.name == "post-flag");
+	if($flagChanger.length < 1) return;
+
+	updateFlagPreview($flagChanger);
+	$flagChanger.on("change", (ev:JQuery.ChangeEvent) => {
+		updateFlagPreview($(ev.target))
+	});
+	setupQRFlags($flagChanger);
+}
\ No newline at end of file
diff --git a/frontend/ts/gochan.ts b/frontend/ts/gochan.ts
index 97a50253..5ffee202 100755
--- a/frontend/ts/gochan.ts
+++ b/frontend/ts/gochan.ts
@@ -10,6 +10,7 @@ import { initStaff, createStaffMenu } from "./management/manage";
 import { getPageThread } from "./postinfo";
 import { prepareThumbnails, initPostPreviews } from "./postutil";
 import { addPostDropdown } from "./dom/postdropdown";
+import { initFlags } from "./dom/flags";
 import { initQR } from "./dom/qr";
 import { getBooleanStorageVal, getStorageVal } from "./storage";
 
@@ -56,6 +57,7 @@ $(() => {
 		addPostDropdown($(elem));
 	});
 	$(document).on("keydown", handleKeydown);
+	initFlags();
 	setCustomCSS();
 	setCustomJS();
 });