Cron Expression Builder
Build cron expressions visually with explain and next run times.
Interactive controls load with JavaScript. Processing stays in your browser.
Loading tool…
How to use
- 用预设或分/时/日/月/周字段拼装，也可直接粘贴表达式。
- 输出中文说明与接下来 N 次触发时间（浏览器本地时区）。
- 标准 5 段 Linux crontab；日与周同时限制时按「或」匹配。
- 只需解释已有表达式也可使用「Cron 表达式说明」。
FAQ
Does Cron Expression Builder upload my data?
No. Cron Expression Builder runs locally in your browser and does not upload content to www.518882.com or third-party APIs.
Do I need an account?
No. Open and use — no signup, login, or paywall. Open Cron Expression Builder and use it — no signup, login, or paywall.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing — suited to private text and drafts.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page. There is no account quota.