Although the "main" book is no longer printed annually, IKEA still releases digital brochures and seasonal catalogues. Here is how to find the PDF versions of current releases:
If you are looking for vintage inspiration or old PDF versions for research, the has digitized its entire history: catalogue ikea pdf
– Websites like Issuu sometimes host user-uploaded IKEA catalog PDFs from past years. Although the "main" book is no longer printed
– Most IKEA product information, room inspirations, and measurements are available online at IKEA.com. They have searchable digital catalogs by room (e.g., living room, bedroom, kitchen). catalogue ikea pdf
The most reliable source for current PDFs is the official IKEA website for your specific country.