To add a mosaic (also known as a red action or blur effect) in Adobe Acrobat DC to hide or obscure sensitive information in a document, you can do so by following these steps:
1.Open PDF file: First, open the PDF file you want to edit in Adobe Acrobat DC.
2.Select Tools:
Click on the "Tools" tab on the right.
Find and tap on the "Protection Tool" or "Red Action" tool. If you don't see this option, you may need to search for "red action" in the Tools menu.
3.Select Mark what you want to hide
In the Protection Tool or Red Action tool, select Mark what you want to hide.
Select the information you want to hide in the PDF document. You can select the text or the entire area.
4.Apply Mosaic Red action:
Once you've chosen what you want to hide, you can choose to apply mosaic or another type of masking effect.
In the Red Action toolbar, select Apply to apply the mosaic effect.
5.Save the file:
When you're done making changes, remember to save the file. You can choose to overwrite the original file or save as a new file.
Please note that the original message will not be recoverable after applying mosaic or other red action effects. So, before making these changes, make sure that you have backed up the original files and confirmed that the information you need to hide is correct. In addition, different versions of Adobe Acrobat DC may cause differences in specific operations, if you have any questions, please refer to the help documentation or **support of the corresponding version.
Adobe Software Encyclopedia