Killing Chaos in Marketing
Display and video ad specs – the complete guide (2025 update)
updated September 2025
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Why this page exists
Some formats never die. Banner ads were declared dead years ago, but they’re still everywhere. And video ads — from YouTube pre-rolls to bumper ads — are now the default currency of digital marketing.
The problem? The specs are fragmented. Google Display has a dozen banner sizes. YouTube has different rules for Shorts, skippable, and non-skippable ads.
This page collects the essentials so you don’t have to keep searching.
Google Display Network (GDN)
The most common banner ad sizes (all in pixels):
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300 × 250 — Medium rectangle
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336 × 280 — Large rectangle
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728 × 90 — Leaderboard
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300 × 600 — Half page
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320 × 100 — Large mobile banner
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160 × 600 — Wide skyscraper
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970 × 90 — Large leaderboard
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970 × 250 — Billboard
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250 × 250 — Square
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200 × 200 — Small square
File types: JPG, PNG, GIF, or HTML5
Max file size: 150KB
Notes: Animated GIFs must be ≤30s, loop max 3 times.
YouTube Ads
Skippable in-stream ads
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Size: 1920 × 1080 px (16:9)
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Format: MP4, MOV
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Max length: 6 minutes
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Recommended: 15–30s
Non-skippable in-stream ads
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Size: 1920 × 1080 px (16:9)
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Max length: 15s
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Format: MP4, MOV
Bumper ads
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Size: 1920 × 1080 px (16:9)
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Max length: 6s
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Format: MP4, MOV
YouTube Shorts ads
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Size: 1080 × 1920 px (9:16 vertical)
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Max length: 60s
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Format: MP4, MOV
Other Video Platforms
Connected TV / OTT
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Standard: 1920 × 1080 px (16:9)
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Max length varies: 15–30s common
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Formats: MP4, MOV
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Notes: Specs vary by provider (Hulu, Peacock, Roku).
Why this matters
Marketers spend billions on display and video. But most of the production still looks like 2003 — assets resized manually, specs scattered, errors everywhere.
Every one of these formats could come out of a single supply chain. Same creative input → multiple outputs. That’s how modern marketing should work.
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