Editing pdf with Preview
I've pasted a picture on a pdf on Preview. But even after saving it, if I open the document again the picture is still editable and removable. Is there a way to "fix it" and make it uneditable? Thanks
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Preview is not a PDF Editor, it is a reader only. Preview will not accept a pasted image onto a PDF, nor will it permit drag and drop from an image on the Desktop onto the PDF. No image that already exists in the PDF when opened in Preview can be changed or removed for the same reason as the first sentence. If you want to paste a picture onto a PDF, then pay for your choice of PDF editors in the Mac App Store (e.g. PDFpenPro, PDF Expert, etc.), or Code Industry's Master PDF Editor for Mac. Check the vendors' websites for free trials of these applications.
That image, if not protected by PDF permissions, may be selected, and copied to the clipboard, but then, can only be pasted into an application that can receive images from the clipboard such as Pages. If the PDF is opened in LibreOffice Draw, then the image(s) in the PDF can be selected and saved to the filesystem.
You can protect existing images in a PDF from selection, or change by opening the PDF in Preview, and choosing Print… > PDF > Save as PDF. On that Save PDF panel is a Security Options… button, which gives you an opportunity to password protect the PDF against users attempting to select text, images, or other content:
