I would suggest you take a look at PDFcrop.
If you wish to crop a pdf with left, top, right and bottom margins of 5, 10, 20, and 30 pt (points), then run
pdfcrop --margins '5 10 20 30' input.pdf output.pdf
in terminal. To actually crop something away, use negative values in the argument for crop. For example,
pdfcrop --margins '-50 -50 -50 -50' input.pdf output.pdf
crops 50 pts from the left, top, right, bottom (in this order).
If you run only the command pdfcrop input, it will output a file titled input-crop.pdf with zero margins. I find this very handy when including pdf illustrations in documents.
Cropping multiple files
Unfortunately, pdfcrop cannot crop multiple files at the time. It is however easy to write a script that will crop all pdfs in the folder the script is located in.
Create a new empty file, and call it something.sh. Open it with a text editor and insert the following:
#!/bin/bash
for FILE in ./*.pdf; do
pdfcrop "${FILE}"
done
Save it, and close. Then right click the file, go to Properties > Permissions and check the field Allow executing file as program. Now close the dialog. Run the script by double clicking it and choosing Run in Terminal. And new, zero-margin cropped version of all pdfs with suffix -crop will now be printed in the folder. If you want margins or other things, you can of course just open the script and add arguments after pdfcrop.
Best Answer
As in many cases it’s just text, you can often remove it simply with
sedor in fact any text editor – let’s say it says “watermark”:If your PDF file is compressed this doesn’t work, you need to uncompress it first, e.g. with
pdftk(How can I install pdftk in Ubuntu 18.04 and later?):If
sed’s output is not readable with your preferred PDF reader, try repairing it withpdftk:Further reading: How to Edit PDFs?
Source: How to remove watermark from pdf using pdftk • Super User