diff --git a/src/main.ts b/src/main.ts
index f29fddb..ba4bdc6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -6,15 +6,10 @@ import { downloadMscz } from './mscz'
 import { getFileUrl } from './file'
 import { WebMscore, loadSoundFont } from './mscore'
 import { getDownloadBtn, BtnList, BtnAction, BtnListMode } from './btn'
-import * as recaptcha from './recaptcha'
 import scoreinfo from './scoreinfo'
 import i18n from './i18n'
 
 const main = (): void => {
-  // init recaptcha
-  // eslint-disable-next-line @typescript-eslint/no-floating-promises
-  recaptcha.init()
-
   const btnList = new BtnList(getDownloadBtn)
   const filename = scoreinfo.fileName
 
diff --git a/src/recaptcha.ts b/src/recaptcha.ts
deleted file mode 100644
index f7e7446..0000000
--- a/src/recaptcha.ts
+++ /dev/null
@@ -1,48 +0,0 @@
-
-/**
- * the site key for Google reCAPTCHA v3
- */
-const SITE_KEY = '6Ldxtt8UAAAAALvcRqWTlVOVIB7MmEWwN-zw_9fM'
-
-type token = string;
-interface GRecaptcha {
-  ready (cb: () => any): void;
-  execute (siteKey: string, opts: { action: string }): Promise<token>;
-}
-
-let gr: GRecaptcha | Promise<GRecaptcha>
-
-/**
- * load reCAPTCHA
- */
-const load = (): Promise<GRecaptcha> => {
-  // load script
-  const script = document.createElement('script')
-  script.src = `https://www.recaptcha.net/recaptcha/api.js?render=${SITE_KEY}`
-  script.async = true
-  document.body.appendChild(script)
-
-  // add css
-  const style = document.createElement('style')
-  style.innerHTML = '.grecaptcha-badge { display: none !important; }'
-  document.head.appendChild(style)
-
-  return new Promise((resolve) => {
-    script.onload = (): void => {
-      const grecaptcha: GRecaptcha = window['grecaptcha']
-      grecaptcha.ready(() => resolve(grecaptcha))
-    }
-  })
-}
-
-export const init = (): GRecaptcha | Promise<GRecaptcha> => {
-  if (!gr) {
-    gr = load()
-  }
-  return gr
-}
-
-export const execute = async (): Promise<token> => {
-  const captcha = await init()
-  return captcha.execute(SITE_KEY, { action: 'downloadmscz' })
-}