保护 PDF
Lock a PDF with a password so that only people who know it can open it. The file is encrypted with AES-256 on your device and never uploaded.
以下文字以英文显示。
使用方法
- Add your PDF.
- Type a password and repeat it.
- Press "Protect PDF".
- Download the protected file and keep the password safe: it cannot be recovered.
常见问题
How strong is the protection?
The file is encrypted with AES-256, the strongest standard PDF encryption. A long password with words, numbers and symbols is much harder to guess than a short one.
Can you recover a forgotten password?
No. Your password never leaves your device and we cannot see it, so nobody, including us, can recover it.
Does it work with every PDF viewer?
Modern viewers (browsers, Adobe Acrobat, Preview, Foxit) open AES-256 PDFs. Very old readers may not.