保护PDF
使用密码保护您的 PDF。为您的文档添加一层安全保护。
Why choose our 保护PDF tool?
Password protection
Add or remove a password to control who can open your file.
Safe & secure
Files are encrypted in transit and deleted from our servers automatically after processing.
Works everywhere
The files we generate open correctly in any reader, on any device.
Lightning fast
Get your converted file in seconds — no waiting around.
100% free
No subscriptions, no hidden fees, no limit on how many times you can use it.
Works on any device
Use it from your computer, tablet, or phone — no app required.