What Are Ad Creative Formats & Specs?
Ad creative formats and specs refer to the technical requirements and standardised dimensions that advertising platforms and publishers require for digital ads. These specifications cover everything from image sizes and file formats to video length, aspect ratios, and file weight limits. They ensure your creative assets display correctly across different devices, browsers, and placements.
Why Specs Matter in UK Media Buying
Using incorrect specifications is one of the most common reasons campaigns underperform. Ads that don't meet platform requirements may be rejected entirely, delayed in approval, or display incorrectly – resulting in wasted budget and poor user experience. UK advertising regulations through the ASA also require clear, compliant creative delivery.
Different channels have vastly different requirements. A Facebook feed ad isn't the same as a programmatic display banner or a YouTube pre-roll video. Understanding these differences prevents costly revisions and approval delays.
Common Ad Format Categories
Display Banners: IAB standard sizes include 728×90 (leaderboard), 300×250 (medium rectangle), and 160×600 (wide skyscraper). File sizes typically max at 150KB.
Social Media: Instagram Stories require 1080×1920px vertical video. LinkedIn ads work best at 1200×627px for images. Facebook supports multiple aspect ratios but 1.91:1 performs best for feeds.
Video Ads: YouTube allows 16:9, 4:3, or 1:1 aspect ratios, with file sizes up to 128GB. Pre-roll ads should be skippable after 5 seconds. UK broadcast standards apply if using TV-style creative.
Native Ads: These match publisher content style and typically include image (1200×627px minimum), headline (70 characters), and description (90 characters).
Key Specifications to Track
Always document: aspect ratio, pixel dimensions, file format (JPEG, PNG, GIF, MP4), file size limits, duration (for video), colour space (sRGB), and any safe margins for text or logos.
Best Practice for Agencies
Maintain a master specs document covering all platforms your clients use – Google, Meta, LinkedIn, programmatic networks, and any direct publisher partnerships. Update quarterly as platforms evolve. Automate where possible using design tools like Figma or Adobe that include built-in spec templates.
Building creative assets that meet specs first time reduces approval cycles, improves campaign launch speed, and demonstrates professional competency to clients.