加密 PDF Document
Encrypt your PDF with a password to restrict access. All processing is completed locally in your browser memory.
选择 PDF 文件
or drag and drop PDF here
Encrypt your PDF with a password to restrict access. All processing is completed locally in your browser memory.
or drag and drop PDF here
Standard cloud lockers require uploading unencrypted PDF archives to their remote environments to append key locks. This poses security and compliance risks. Document Alter executes cryptographic operations directly inside your browser's memory context.
The tool processes your document byte stream locally, combining your custom user password with encryption hashes using @pdfsmaller/pdf-encrypt-lite. The security parameters are compiled directly into the PDF's header catalog metadata dictionary, ensuring robust lock integrity.
Drag and drop the target PDF you want to protect into the secure dropzone.
Enter your chosen password in the input field within the settings sidebar.
Click the 'Encrypt PDF' button to run encryption routines locally and save your password-locked file.
DocumentAlter 在浏览器内存中直接对 PDF 应用安全密码加密算法，生成标准加密文档。
绝对安全。加密运算纯在本地内存进行，您的密码和文档绝不经过网络传输。
采用行业标准加密算法，确保没有正确密码的用户无法打开或提取文档数据。