(abbreviation, alt-of, countable, initialism, uncountable) Initialism of Portable Document Format, a standard for representing electronic documents, allowing them to be transmitted and reproduced accurately with the same printed layout.
DjVu was developed at AT&T Research by Yan LeCun et al. in 1966. It generates files that are smaller than PDF files. […] PDF primarily encodes graphics and text as vectorized data, whereas DjVu primarily encodes them as pixmap images. 2021, Alexander Thomasian, Storage Systems..., §2.13.7
(abbreviation, alt-of, countable, initialism, uncountable) Initialism of portable document format (“a document in PDF format”).
The reMarkable PDF reader is really targeted at the digital writing market, rather than the digital reading market, though most serious e-readers support pens for annotations and signatures. 2019 June 27, Jack Schofield, “What’s the best cheap tablet or e-reader for PDF files?”, in The Guardian:
Teams are required to clearly highlight the relevant specification or standard (e.g., ASTM number, VOC content) directly on the PDF for each material to demonstrate compliance.
Provide PDFs of basic technical information for materials lacking specific requirements. For example, printouts from store websites or packaging showing material properties are acceptable. 2025 September 2, “2026 American Society of Civil Engineers Concrete Canoe Competiton Request for Proposals”, in ASCE, archived from the original on 07 Sep 2025, page 26:
(alt-of, countable, uncountable) Alternative letter-case form of pdf (“probability density function”).