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Enter your email on Gumroad and both PDFs (A4 and US Letter) arrive right away - no account needed. Print at "Actual size" or 100% so the lines stay true to size; a 50 mm bar at the top lets you check with a ruler.
Free for your own personal use. Please link to this page rather than sharing the file.
All 18 papers in one file
Every notebook paper in one file: graph, millimeter and 2 mm grids, a coordinate plane, lined, Cornell notes, staff paper, handwriting lines, Korean and Chinese writing grids, isometric lines and dots, polar, semi-log and a mind map, with a tap-to-jump index for GoodNotes. Each paper is also free on its own on this site.