Custom diamond painting kits are usually ordered ready-made. If you already have drills and a canvas, or you're putting a kit together yourself, you can make the chart for free — it builds in your browser in a couple of seconds.
Pick a size — 20 × 30, 30 × 40, 40 × 50 or 50 × 65 cm — and 16, 24, 32 or 48 colors. The chart is made for 2.5 mm square drills, so 30 × 40 cm works out to 120 × 160 drills. Colors come from the DMC palette, the numbering most drill sellers use. Stray single drills are cleaned up, and for portraits you can turn on dithering for smoother transitions.
The key shows each symbol with its DMC code and name, how many drills you need and how many to buy with a 10% spare. If a color is out of stock, click it and swap in a close DMC code.
The PDF is laid out on US Letter or A4: an overview with a preview and page map, the key, and the chart with symbols, a 10-cell grid, running numbers and overlap where pages meet. Print it in color or as symbols only.