Chang Yanwei Office Knowledge
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FAQ

Are these tools completely free?

Yes, all tools are free forever — no signup, no ads, no tracking.

Will my data be uploaded?

Most tools run entirely in your browser (no server needed). A few tools (Excel/Word/PPT to PDF) require server-side processing — uploaded files are auto-deleted after 5 minutes. See Privacy page for details.

Which browsers are supported?

We recommend the latest Chrome, Edge, or Firefox. ES2020 and Web Crypto API support is required.

What if a tool gives wrong results?

Every tool page has a "💬 Wrong result?" button at the bottom — click it to send feedback. We continuously improve.

Can I use the tools offline?

Browser-local tools work offline once loaded. Server-assisted tools (Office to PDF, etc.) require an internet connection.

Are there keyboard shortcuts?

Yes: press / to focus search; Esc to dismiss; g h to go home; g t to toggle theme; g m to toggle dark mode.

How can I suggest a new tool?

We'd love to hear your ideas! Use the contact info at the bottom of any page.

Why is it called "Chang Yanwei Office Knowledge"?

It started as a VBA online tool collection, then expanded to M / DAX and other office automation languages. The domain stuck.