Encrypt PDF

Add an open-password to your PDF to protect privacy. Browser-based encryption with AES — your file is never uploaded to any server. Free and watermark-free.

拖拽 PDF 文件到这里，或点击选择

浏览器本地处理，文件不上传服务器

需要更多功能？试试 PDF 工具箱完整版 （含合并、拆分、水印、签名、提取等 11 项功能）

PDF Tools · Related Tools

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PDF Toolbox

Merge / split / rotate / delete / watermark / number / encrypt / convert / sign / extract
Merge PDF

Combine multiple PDFs into one
Split PDF

Split PDF by page range
Rotate PDF

Rotate single or all pages
Delete PDF Pages

Remove selected pages
Watermark PDF

Text watermark with opacity