What kind of protection can I add?

You can set an open password (required to view the file) and restrict printing, copying, and editing.

Is encryption strong?

The tool applies 128-bit RC4 or 128-bit AES encryption depending on the PDF version.

No. Password protection is applied securely in your browser without uploading.

PDF

保护PDF

为PDF添加密码和权限限制。

点击或拖拽

PDF files only

Passwords

Set passwords to control access and editing.

Open password *

Owner password (optional)

Permissions

Control what recipients can do with the PDF.

Allow printing

Recipients can print the document

Allow copying text

Recipients can copy text from the document

Upload a PDF to protect with a password.

Uses 128-bit RC4 encryption. The owner password controls permission restrictions — leave blank to use the user password as owner password.

PixTrimIO 可让 PDF 和图片处理快速、私密，并直接在浏览器中完成。 Privacy-first PDF and image tools that run entirely in your browser. Compress, merge, convert, crop, OCR, and edit files online for free without uploading.