A4 and Letter artboards with print-aware structure
Choose A4 or Letter when you open the letterhead deliverable. That choice sets page size for everything downstream: Word imports, commercial print, and PDF exports clients will print themselves. Do not design on the wrong regional standard and discover the mismatch at the printer.
Headers typically carry the logo and optional secondary identity line. Footers carry registered address, phone, email, web and sometimes registration or regulatory disclosures. Leave a generous writing area — letterheads fail when decorative elements invade the body zone documents actually need.
Multi-page support matters for proposals and reports. Design a first page with fuller branding if you want, and lighter continuation pages that still feel on-brand without repeating heavy headers that waste space.