保护PDF AES 256位加密。控制访问和权限。
将您的PDF拖放到此处
或 点击选择
PDF — Max 50 MB
打开密码
权限（可选限制）
PDF保护成功！
下载实际效果
典型文件的实际压缩示例
前 / 后
未保护PDF
已加密PDF
AES
256-bit
6s
平均时间
按模式压缩比
"我的PDF合同在5秒内加上了密码保护！"
How to password-protect a PDF online?
Password-protecting a PDF prevents unauthorised access to your confidential documents. FileSwiftly applies AES 256-bit encryption — the banking standard — in seconds, entirely online, with no software required.
AES 256-bit encryption
AES 256-bit encryption is used by banks, governments and militaries to protect their most sensitive data. With a strong password (12+ characters, uppercase, digits, symbols), it is virtually unbreakable. Even with the most powerful computers, a brute-force attack would take billions of years.
PDF permission restrictions
In addition to the open password, you can set permission restrictions: block printing, prevent text copying, or disable editing. These restrictions are independent of the open password — you can apply them even to a PDF without an open password.
Remove PDF password protection
To remove the password from a PDF you own, use our Unlock PDF tool. Enter the current password and download your decrypted PDF.
FAQ
What if I forget my password?
There is no recovery option. AES 256-bit encryption is designed to be irreversible without the password. Keep it safely stored.
Can I protect an already-encrypted PDF?
Yes, but you'll need to unlock it with the old password first, then re-protect it with the new one.
需要更多？
Pro版支持批量加密保护PDF
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