Supported formats
This function provides PDF, PDF format conversion. Do not upload illegal or infringing files.
PDF加密
PDF加密是一种安全技术，旨在为PDF文档提供保护。它可以控制文档的访问权限，以确保只有授权用户才能访问该文档。PDF加密可以使用多种类型的加密算法，例如AES-256和128位RC4加密，以保护文档的数据。它还可以限制文档的打印、复制和编辑，以防止文档被未经授权的用户使用。
Upload a file and click Confirm to submit the conversion task. Do not upload illegal or infringing content.
PDF加密
Remeins provides free PDF加密 tools with unlimited usage, up to 30MB per file, and no charge.
About file security
We take file security seriously. Do not share file codes with others. All files are automatically deleted after one day.