PMAX Asset Group Best Practices: Images, Headlines & Ad Strength 2026
Performance Max asset group best practices for 2026: required image sizes and ratios, headline and description count, video requirements, logo specs, sitelinks, and how to achieve Excellent ad strength.
PMAX Asset Group Best Practices: How to Build High-Strength Google Ads Assets
The asset group is the creative engine of a Performance Max campaign. Everything Google serves across Search, Shopping, Display, YouTube, Discover, and Gmail comes from the assets you provide here. A thin asset group — minimum images, five generic headlines, no video — produces Generic ad strength, broad channel coverage, and poor performance.
A well-built asset group gives Google the raw material to find the best-performing format for every placement. This guide covers the exact specifications, quantities, and quality standards that separate average PMAX asset groups from high-performing ones.
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What Goes Into a PMAX Asset Group
An asset group contains:
| Asset Type | Minimum Required | Recommended Maximum |
|---|---|---|
| Images (landscape 1.91:1) | 1 | 20 |
| Images (square 1:1) | 1 | 20 |
| Images (portrait 4:5) | 0 | 20 |
| Videos | 0 (Google generates one) | 5 |
| Headlines (30 chars) | 3 | 15 |
| Long headlines (90 chars) | 1 | 5 |
| Descriptions (90 chars) | 2 | 5 |
| Business name | Required | 1 |
| Logos (square 1:1) | 1 | 5 |
| Logos (landscape 4:1) | 0 | 5 |
| Sitelinks | 0 | 4+ |
| Call extensions | 0 | Optional |
Google uses this inventory to construct ads in real time. The more variety you provide, the more combinations Google can test — and the more placements become eligible for your ads.
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Image Requirements: Sizes, Ratios, and Quality
Images are served across Display, Discovery, Gmail, and YouTube (as static frames). Google requires specific aspect ratios — submitting images in the wrong ratio or at the minimum size produces low-quality creatives.
Landscape: 1.91:1 ratio
Required size: 1200×628 pixels (minimum: 600×314)\
Use: Display Network, Discovery, Gmail, responsive Search ads\
Recommendation: Upload at 1200×628 or larger. This is the most widely served format across desktop Display and responsive search placements. Provide 3-5 landscape images with different content — product shots, lifestyle images, and a text-overlay version if your brand guidelines allow.
Square: 1:1 ratio
Required size: 1200×1200 pixels (minimum: 300×300)\
Use: Display Network, Gmail, YouTube\
Recommendation: Provide at least 3-5 square images. Square images serve in more placements than landscape alone. If you only have landscape images, crop or reframe them — don't stretch.
Portrait: 4:5 ratio
Required size: 960×1200 pixels (minimum: 480×600)\
Use: YouTube Shorts, mobile Discovery, mobile Display\
Recommendation: Not required, but adds eligibility for mobile-first placements. If you run any video ads, you likely already have content you can frame as portrait.
Image quality guidelines
• No text overlays larger than 20% of the image area — Google penalizes text-heavy images
• No borders, watermarks, or promotional overlay text (price callouts, "SALE" badges)
• Use real product photos or authentic lifestyle images over generic stock photos
• Avoid images with small subjects or cluttered backgrounds on Display placements — simple, high-contrast images outperform on small ad units
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Headline Best Practices: 15 Headlines, 30 Characters Each
Headlines are the highest-leverage asset in a PMax group. Google mixes and matches them to form responsive ads across channels. More headlines = more combinations tested = faster learning.
Quantity: Provide all 15 available headlines. Don't stop at 5 or 7.
Length: Up to 30 characters. Not every headline needs to hit 30 — some of the best performing headlines are short and punchy.
Character count in practice:
• "Start Your Free Trial" = 21 characters ✓
• "No Long-Term Contracts" = 22 characters ✓
• "Trusted by 10,000+ Advertisers" = 30 characters ✓
Content strategy for 15 headlines:
| Category | Headlines | Example |
|---|---|---|
| Primary keyword (3 headlines) | Feature your target keyword naturally | "Performance Max Management" |
| Value proposition (3 headlines) | Cost savings, speed, ease of use | "All Your Campaigns in One Place" |
| Social proof (2 headlines) | Numbers, reviews, awards | "Trusted by 10,000+ Businesses" |
| Features (3 headlines) | Specific capabilities | "AI-Generated Ad Copy" |
| CTA / urgency (2 headlines) | Action-oriented | "Start Free Today" |
| Differentiators (2 headlines) | What makes you different | "No Per-Seat Pricing" |
Common headline mistakes:
• Repeating the same message with slightly different wording — Google sees these as redundant
• All headlines that start with the same word — Google flags this as low variety
• Headlines that don't make sense on their own (PMax can serve any headline in any position)
• Ending every headline with a period — punctuation wastes characters and looks odd mid-sentence
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Description Best Practices: 5 Descriptions, 90 Characters Each
Descriptions appear below headlines in responsive ads. Provide all 5 available descriptions.
Each description should:
• Stand alone (not depend on a specific headline p