The Definitive Guide to LinkedIn Paid Ad Specs

Mastering LinkedIn advertising is rarely about creative genius alone; it lives or dies in the technical margins. Mismatch a single aspect ratio, clip a pixel off a text overlay, or exceed a file-size limit, and your campaign is stalled before it even enters the auction.

Whether you are scaling B2B SaaS pipelines, recruiting executive talent, or driving thought leadership, navigating LinkedIn’s exact parameters is essential. Below is the comprehensive, master reference guide to LinkedIn paid ad specifications.

1. Single Image Ads

Single image ads are the backbone of LinkedIn feed campaigns. They appear natively in the desktop and mobile feeds, blending high-impact visuals with direct response copy.

• Aspect Ratios & Recommended Sizes:
  • Landscape (1.91:1): $1200 times 628$ pixels (Desktop & Mobile)
  • Square (1:1): $1200 times 1200$ pixels (Desktop & Mobile)
  • Vertical (4:5): $720 times 900$ pixels (Mobile only)
• File Types: JPG, PNG, or non-animated GIF
• Maximum File Size: 5 MB
• Copy Constraints:
  • Intro Text: Recommended under 150 characters (hard truncation occurs past tighter limits, though field allowances go higher).
  • Headline: Up to 70 characters (ideal for stopping the scroll).
  • Call to Action (CTA): Select from preset choices (