PDF安全
Protect, unlock, sign, and redact PDFs instantly. Add passwords, remove restrictions, and secure your documents. All processing happens in your browser — your files never leave your device.
Shield
保护PDF
用密码保护PDF。设置打印、复制、编辑权限。
Unlock
解锁PDF
移除您拥有的PDF的密码保护。
PenTool
PDF签名
向PDF添加数字签名。具有法律约束力的电子签名。
Eraser
PDF编校
从PDF中永久删除敏感内容。涂黑工具。
BadgeCheck
认证PDF
添加digital certification to PDFs. Long-term validation and timestamps.
Clock
PDF时间戳
添加trusted timestamps to PDFs. RFC 3161 compliant. Server-side.
Lock
添加密码
添加password protection to PDFs without encryption. Basic access control.
Key
删除密码
删除known password from PDFs. Requires current password.