免费 · PDF
PDF 密码保护.
PDF 密码保护 — 无需注册，即可在浏览器中使用免费工具。
使用方法: PDF 密码保护
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
限制与支持格式
输入内容在您的设备上处理。货币换算仅发送货币代码，以获取带日期的参考汇率。
英语技术说明
20 MiB combined input; 200 pages for structural operations, 60 seconds for QPDF operations. Use 8–200 printable ASCII characters. A random owner password is generated locally. This is encryption, not a cryptographic document signature.
Encrypt a PDF with AES-256 and an opening password. Use 8–200 printable ASCII characters. A random owner password is generated locally. This is encryption, not a cryptographic document signature. Files are processed on your device; no PDF upload is required.
Choose a local PDF and adjust the displayed settings.