PMAX Asset Group Best Practices: How to Build High-Strength Google Ads Assets
Founder at Adship
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.
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.
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
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
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 pairing)
- Include at least one CTA in 2-3 of your descriptions
- Use your remaining descriptions for social proof, feature highlights, or guarantees
Format that works:
- Description 1: Benefit + feature: "Manage Meta and TikTok ads in one dashboard. Built for agencies."
- Description 2: Social proof + CTA: "Join 10,000+ advertisers saving time. Start your free 7-day trial."
- Description 3: Problem/solution: "Stop switching between ad platforms. Adship centralizes everything."
- Description 4: Feature detail: "AI copy generation, bulk operations, and automation rules included."
- Description 5: Trust/guarantee: "No contracts, cancel anytime. Free trial, no credit card required."
Logo Assets
Logos appear in responsive Display ads and give brand recognition to otherwise generic ad formats.
Required logo formats:
- Square logo (1:1): 1200×1200 pixels (minimum 128×128) — primary logo format
- Landscape logo (4:1): 1200×300 pixels — used in wider Display placements
Logo guidelines:
- White or transparent background — logos on colored backgrounds look unprofessional in display ads
- Symbol/icon version performs better than full wordmark at small sizes
- Upload both square and landscape if available
Video Assets: Why They Matter More Than You Think
Video assets are technically optional in PMax — if you don't upload one, Google auto-generates a video from your images and text. Auto-generated videos are almost universally poor quality: stiff transitions, generic music, no real creative direction. They serve on YouTube and often hurt performance when that placement dominates spend.
If you have any video content: Upload it. Even a product demo recorded on a smartphone is better than an auto-generated slideshow.
Ideal video specifications:
- Length: 15-30 seconds (required for YouTube); 6-second bumper cuts are also useful
- Aspect ratio: Horizontal 16:9 for YouTube; square 1:1 and vertical 9:16 increase placements
- Hook in first 5 seconds: YouTube serves skippable ads — the first 5 seconds must earn attention
- Include your product or service in the first 5 seconds (don't front-load a logo or brand intro)
If you don't have video: Consider creating a simple slideshow using a tool like Canva or Google's own ad creation tool. A basic 15-second video with product images, text overlays, and music outperforms auto-generated videos significantly.
Sitelinks and Ad Extensions
Sitelinks are not technically part of the asset group but directly improve PMax ad quality and CTR.
Sitelinks: Add 4-8 sitelinks pointing to key product categories, landing pages, or support content. Each sitelink should have a short title (25 chars) and 2 description lines (35 chars each).
Callout extensions: Short benefit phrases ("Free shipping", "24/7 support", "30-day returns") that append to your ads in additional line.
Call extensions: Your phone number. Important for local businesses and B2C services.
Structured snippets: List your product/service categories or features.
Ad Strength: How to Hit Excellent
Ad strength is Google's quality score for asset groups — Poor, Average, Good, or Excellent. Excellent ad strength correlates with more impressions and lower CPCs, but it's not a direct ranking factor. It's a proxy for variety and completeness.
Requirements for Excellent ad strength:
| Component | What's Needed |
|---|---|
| Images | At least 3 images across 2+ aspect ratios |
| Headlines | 15 headlines with high variety (different start words, different lengths) |
| Descriptions | 5 descriptions |
| Video | At least 1 uploaded (not auto-generated) |
| Logos | Square logo uploaded |
| Final URLs | Multiple URL options enabled, or specific landing pages set |
Common reasons for less-than-Excellent:
- Fewer than 15 headlines
- Headlines that repeat the same opening word
- No video uploaded (auto-generated doesn't count toward strength)
- Missing square logo
- Only one image aspect ratio provided
Check asset strength in detail: In Google Ads, expand your asset group and click "View asset details." You'll see individual asset ratings (Low, Good, Best) based on how each asset performs when served. Over time, pause Low-rated assets and replace with new variations.
Speeding Up Creative Production With Adship
If you're managing campaigns for multiple clients, creative production becomes repetitive fast — complete creative libraries, multiple headlines and descriptions, and video for each.
Adship streamlines the source creative for your Meta and TikTok campaigns: the AI text generator writes ad copy in seconds based on your product description, and the creative library lets you organize and reuse winning assets. You can then repurpose those proven headlines, descriptions, and images when you build your PMAX asset groups in Google Ads.
Adship manages Meta and TikTok, not Google Ads — but keeping your source creative organized removes most of the manual work before the PMAX handoff.
Start managing your Meta and TikTok ads with Adship — free trial
Asset Group Checklist
Before launching any PMAX campaign, verify:
- 5+ landscape images (1.91:1, 1200×628+)
- 5+ square images (1:1, 1200×1200+)
- 3+ portrait images (4:5) if mobile placements are a priority
- At least 1 real video (not auto-generated)
- 15 headlines with varied content and start words
- 5 descriptions with at least 2 CTAs
- Square and landscape logos uploaded
- 4+ sitelinks configured
- Ad strength shows Good or Excellent
- First-party audience signals connected
See also:
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