🕐 在线时钟（全屏大字）Fullscreen Clock
大字号在线时钟，可全屏显示，支持 12/24 小时制、显示秒和日期，适合直播、倒数和会议计时。A big online clock you can make fullscreen, with 12/24-hour mode, seconds and date — good for streams, meetings and countdowns.
使用说明与常见问题How-to & FAQ
「在线时钟（全屏大字）」是什么？What is the Fullscreen Clock tool?
大字号在线时钟，可全屏显示，支持 12/24 小时制、显示秒和日期，适合直播、倒数和会议计时。A big online clock you can make fullscreen, with 12/24-hour mode, seconds and date — good for streams, meetings and countdowns.
如何使用「在线时钟（全屏大字）」？How do I use the Fullscreen Clock tool?
在「在线时钟（全屏大字）」中，按需设置点击「全屏」按钮即可。In the Fullscreen Clock: Click "Fullscreen".
全屏不生效怎么办？Fullscreen doesn't work?
全屏需要你点击“全屏”按钮触发（浏览器要求用户操作）；部分嵌入环境或 iframe 可能禁用全屏 API。按 Esc 可退出全屏。Fullscreen must be triggered by clicking the button (browsers require a user gesture); some embedded/iframe contexts disable the API. Press Esc to exit.
手机上能用吗？Does it work on mobile?
可以。「在线时钟（全屏大字）」支持触屏操作，在手机和平板浏览器中均可使用，无需安装 App。Yes. The Fullscreen Clock supports touch input and works in mobile and tablet browsers without installing an app.
「在线时钟（全屏大字）」免费吗？需要注册吗？Is the Fullscreen Clock free? Do I need an account?
「在线时钟（全屏大字）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Fullscreen Clock is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.