diff --git a/packages/frontend-shared/js/const.ts b/packages/frontend-shared/js/const.ts
index 7f56f673c4..8391fb638c 100644
--- a/packages/frontend-shared/js/const.ts
+++ b/packages/frontend-shared/js/const.ts
@@ -106,6 +106,10 @@ export const ROLE_POLICIES = [
 export const CURRENT_STICKY_TOP = 'CURRENT_STICKY_TOP';
 export const CURRENT_STICKY_BOTTOM = 'CURRENT_STICKY_BOTTOM';
 
+export const DEFAULT_SERVER_ERROR_IMAGE_URL = 'https://xn--931a.moe/assets/error.jpg';
+export const DEFAULT_NOT_FOUND_IMAGE_URL = 'https://xn--931a.moe/assets/not-found.jpg';
+export const DEFAULT_INFO_IMAGE_URL = 'https://xn--931a.moe/assets/info.jpg';
+
 export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'scale', 'position', 'fg', 'bg', 'border', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'ruby', 'unixtime'];
 export const MFM_PARAMS: Record<typeof MFM_TAGS[number], string[]> = {
 	tada: ['speed=', 'delay='],