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Discover LudwigSuggestions(5)
The phrase "PDF file" is correct and usable in written English.
It is typically used to refer to a computer file in the Portable Document Format (PDF). For example, "I sent you the report as a PDF file."
Exact(49)
PDF file.
pdf file.
pdf file (43 pages).
pdf file (7 pages).
map, digital, PDF file.
47 MB PDF file.
Similar(11)
v. : digital, PDF files.
Downloading them as PDF files costs $5 to $10 each.
PDF files often are not text.
Reader to read PDF files.
Thirty-two PDfileses containing embedded 3D models have been created.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com