View PDF metadata:

# exiftool file.pdf

View specific metadata:

# exiftool -Creator file.pdf
# find . -type f -iname '*.pdf' -exec exiftool -Creator {} \;

Set metadata:

# exiftool -Creator='barbapappa' file.pdf
# find . -type f -iname '*.pdf' -exec exiftool -Creator='barbapappa' {} \;

to preserve date/time:

-P

to delete backup file that is created:

-delete_original[!]

# find . -type f -iname '*.pdf' -exec exiftool -P -overwrite_original -Producer='www.bladiebla.nl' -Creator='barbapappa' {} \;
# find . -type f -iname '*.pdf' -exec exiftool -P -delete_original! {} \;

Edit in one metadatafile

Make a parameter file

-Title=Mijn Titel
-Author=Mijn Naam
-Creator=Microsoft Word
-Producer=Adobe PDF Library 15.0
-Subject=Korte samenvatting
-Keywords=tag1, tag2, tag3
-CreateDate=2025:08:14 08:00:00
-ModifyDate=2025:08:14 08:00:00

and apply with:

# exiftool -@ meta.args -overwrite_original pdfbestand.pdf