Add password protection to your PDF. Set a strong password to prevent unauthorised access — the encryption happens entirely in your browser and your file is never uploaded.
常見問題
How strong is the password protection?
The encryption uses AES-128, the standard for PDF protection. Choose a long, unique password — the stronger your password, the harder it is to crack the encryption.
What if I forget the password?
We cannot recover it for you. The password is applied during the encryption process on your device and we never see or store it. Keep your password in a safe place.
Can I set different permissions (e.g. print but not edit)?
Currently the tool applies full password protection that requires the password to open the PDF. Granular permission settings may be added in a future update.
在您的瀏覽器內完成
您的 PDF 全程在瀏覽器內處理，絕不會上傳到任何伺服器，我們也無法查看或存取您的檔案。
其他 PDF 工具
我們不會儲存您的任何資料。