If you want to add it specifically to the header section in a Pages document you can open up the document set-up, make sure header is turned on, go to more options then click in the header area and paste it. I’d guess drag and drop would work. Paste definitely does.
Ha, we all have those days! Just an FYI, no need to convert to PNG, you should be able to just drop a pdf in straight. Also, no need to trim down (though I guess that could cut file size) because once in the document you can double tap or double click to use the cropping tool in Pages. Works like a charm for cropping and repositioning images.
One advantage to converting to a PNG and then trimming is file size reduction. Cropping a PDF does not actually remove any content. It just makes the cropped-out content not visible which means the size on disk is still the same.
Cropping a PNG removes the content which means the resulting image takes less space on disk than the original.
Not exactly the way your asking for, but this is how I do it.
I do have a digital version (pdf) of my letterhead. To use that in a Pages (or, in my case Word) document (kind of…), I save the document as a pdf. And apply the letterhead pdf as a background using pdftk.
Your Pages doc doesn’t contain the letterhead in this way. That could be a disadvantage. However, I think/believe/assume the quality of the end result is better this way.
I had to Google this (too). That’s a nifty website for those kind of questions, you know. But apparently, pdftk is not compiled for the M1. However, there is pdftk-java which is compatible. That being said, I personally loathe anything Java.
@tjluoma I’m using it in an Alfred Workflow like this (this is the script step, obviously):
for f in "$@"
TMPNAME="$(basename "$f" .pdf)_frbg.pdf"
/usr/local/bin/pdftk "$f" multibackground /Users/myuser/Documents/Backgrounds/Letterhead.pdf output "$DIRNAME"/"$TMPNAME"
mv "$f" "/Users/myuser/.Trash/"
mv "$DIRNAME"/"$TMPNAME" "$DIRNAME"/"$FILENAME"
It applies the background and throws away the temporary file, i.e. the one without the background. I’m using the multibackground option, as my letterhead pdf has multiple pages: a true letterhead page and a followup page with basically just a logo and footer.
That’s not a clickable link because I don’t want you to download that. It won’t work, because that is a 32-bit version that won’t run after Mojave. (10.6 refers to Snow Leopard, which came out approximately 75 years ago).