Essential Business Letter Format: Structure, Style, and Best Practices

Core Layout of a Business Letter

Every business letter follows a consistent visual hierarchy that ensures readability on desktops and mobile screens. Start with the sender's address at the top left, followed by the date, the recipient's address, a formal greeting, the body, a closing, and the signature block. Use a single‑spaced layout with a blank line between each major element; this spacing translates well to narrow mobile viewports without sacrificing professionalism.

Header Details

Include the full postal address, phone number, and email in the header. If the letter is sent electronically, add a hyperlink to the email address. Align left; avoid centering, which can cause truncation on small screens. The date should be written in the international format (DD Month YYYY) to avoid regional confusion.

Salutation and Opening

Address the recipient with a precise title (e.g., "Dear Ms. Sato,"). When the name is unknown, use a generic yet respectful greeting such as "Dear Hiring Manager." The opening sentence states the purpose concisely—this matters for voice‑search snippets and quick scans on mobile devices.

Body Structure

Divide the body into short paragraphs, each covering a single idea. Begin with a brief introduction, follow with supporting details, and end with a clear call‑to‑action. Bullet points are acceptable for lists, but keep them to three items or fewer to preserve scroll‑friendliness.

Closing and Signature

Choose a professional closing ("Sincerely," "Best regards,") and leave three blank lines for a handwritten signature if printed. Below the signature, type the sender's full name, title, and company. For digital letters, insert a scanned signature image or use an electronic signature tool that scales correctly on mobile.

Formatting Tips for Mobile‑First Readability

Use a legible sans‑serif font (e.g., Arial, Helvetica) at 11‑12 pt size. Keep line length under 70 characters to avoid horizontal scrolling. Avoid excessive bold or italics; they can render poorly on low‑resolution screens. When attaching the letter as a PDF, embed fonts to maintain appearance across devices.

Sample Comparison Table