> Quick answer: The best Google ad combines keyword-rich headlines (30 characters max each), tight descriptions (90 characters max each), and clean images (1200×628 px for landscape). Pick the right campaign type, write multiple variations, and let Google's AI surface the winners.
Building a Google ad that converts takes more than filling in a form. A few smart decisions upfront save you money and get better results faster.
What Makes a Good Google Ad
A strong Google ad matches what users are searching for, communicates real value, and drives a clear action.
Key components: headlines, copy, images, and CTAs
Every ad has three moving parts. Headlines grab attention. Descriptions expand the pitch. Images (for Display and Performance Max) reinforce the message visually. A CTA tells people exactly what to do next.
Relevance to user intent and search keywords
Your ad copy should reflect what users are actually searching for. Per Google's Ads Help Center, including keywords naturally in your headlines and descriptions keeps your ad relevant and your quality scores healthy. An ad that mirrors the user's query earns lower costs per click over time.
Clear value proposition and differentiation
Tell people why you. Free shipping. Expert support. A limited-time deal. Specific claims outperform generic ones. Highlight what competitors don't offer.
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Step 1: Choose Your Campaign Type and Goal
The campaign type determines where your ad appears and how Google optimizes spend.
Understand Google Ads campaign types (Search, Display, Performance Max)
Three main options cover most advertisers. Search puts text ads on search results pages. Display places visual banners across Google's partner network. Performance Max runs across all Google inventory and uses AI to find the best placements and asset combinations automatically.
Define your primary goal (sales, leads, website traffic, brand awareness)
Per Google's official campaign setup guide, you start by choosing a goal: Sales, Leads, Page Views, or Brand Awareness. Your goal shapes the bidding strategy Google recommends and what conversions to track. Set up conversion tracking before launch. Without it, optimization has nothing to learn from.
Select the format that matches your creative assets
Strong product images and lifestyle shots? Performance Max and Display put them to work. Working text-only? Search campaigns are the natural starting point.
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Step 2: Build Your Ad Copy and Headlines
Good copy is tight, specific, and action-oriented.
Write 3-15 compelling headlines (30 characters max each)
Per Google Ads documentation, each headline caps at 30 characters. You can write up to 15. Google's AI tests combinations and surfaces top performers. More options mean better optimization. Don't stop at three.
Create 2-5 descriptions (90 characters max each)
Descriptions give you 90 characters to expand on the headline. Write 2 to 5 variations. Lead with price in one, a core benefit in another, urgency in a third. Vary the angle.
Include keywords naturally in headlines and descriptions
At least one keyword per headline, ideally per description too. Per Google's AI copywriting guidance, including keywords in every asset directly improves relevance signals.
Add a strong call-to-action
"Shop now." "Buy today." "Get a quote." Per Google's own copywriting resource, CTAs with urgency words like "today" and "now" drive stronger click rates. Be specific. "Learn more" is weaker than "See pricing today."
Highlight unique value propositions
Free delivery, expert advice, a satisfaction guarantee. Put your best differentiator in the first two headlines where it shows most reliably.
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Step 3: Prepare High-Quality Images
Image quality affects both performance and policy compliance.
Landscape images: 1200×628 px (1.91:1 ratio)
Required for Performance Max and responsive Display campaigns. Per Google's Performance Max asset requirements documentation, landscape is the primary format and must be included.
Square images: 1200×1200 px (1:1 ratio)
Also required. Square images fill placements where landscape doesn't fit. Skipping this format limits your reach.
Portrait images: 960×1200 px (4:5 ratio) for optional expansion
Portrait is optional but recommended. It unlocks additional inventory placements across mobile.
File size limits: max 5MB per image
Google caps each image at 5,120 KB. Keep files optimized without sacrificing visual quality.
Avoid text overlays, watermarks, and graphic clutter
Google Ads policy prohibits text and logo overlays baked into image files. These elements must be added through the platform. Embedded overlays get assets rejected and hurt performance.
Use product shots or lifestyle visuals
Real products and real use cases outperform abstract designs. Show the outcome your customer wants.
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Step 4: Test and Optimize Your Creative Variations
Testing is built directly into how Google Ads works.
Create multiple headline and description combinations
Upload the maximum number of headlines, descriptions, and images allowed. Google's AI runs combinations automatically and identifies top performers. More input means better outputs.
Test different images and messaging approaches
Vary the creative angle, not just the words. Try a product-focused image against a lifestyle shot. Try a price-led headline against a benefit-led one. Small shifts reveal big insights.
Use Google Ads' AI to identify top-performing combinations
Responsive Search Ads and Performance Max surface winning combinations without manual A/B setup. Let the system run long enough to collect data before drawing conclusions.
Monitor ad strength feedback and refine copy
Google's ad strength indicator flags weak assets. Low scores usually mean copy is too generic or image variety is too thin. Adjust one element at a time. Avoid rewriting everything at once because that resets the learning period.
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Why Coinis Accelerates Your Google Ads Workflow
Coinis doesn't publish directly to Google Ads today. That's on the roadmap. But it handles the creative work that slows most advertisers down.
Generate image ads from product URLs
The Image Ads workflow turns any product URL into campaign-ready visuals powered by cutting-edge AI models. No design tools. No manual sizing. Export in Google's required formats and upload directly to Ads Manager.
Recreate competitor ads to inspire creative strategy
Ad Clone analyzes what's working in your niche and builds inspired variations fast. Start from what's already proven, then make it yours.
Resize creatives for Google's specific formats automatically
Smart Resize in Coinis Revise outputs landscape, square, and portrait from a single source image. One creative covers all three required sizes in seconds.
Edit and refine ad images in seconds with Coinis Revise
Swap colors. Change text on image. Erase distracting elements. Each edit is one click. No design background needed.
Create AI-driven ad copy that aligns with brand voice
AI Copywriting, powered by your Brand Profile, writes keyword-rich headlines and descriptions tuned to your tone. Write more variations. Test faster. The hardest part of ad copy is getting started. Coinis handles that.
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Or let Coinis do it.
From a product URL to a live Meta campaign. AI-generated creatives. On-brand copy. Direct publish to Facebook and Instagram. Real performance reporting. All in one platform.
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Frequently Asked Questions
How many headlines should I write for a Google ad?
Write as many as Google allows for your campaign type. Responsive Search Ads support up to 15 headlines (30 characters each). The more variations you provide, the better Google's AI can test combinations and find top performers.
What image size does Google Ads require?
Performance Max and responsive Display campaigns require at least two image formats: landscape at 1200×628 px (1.91:1 ratio) and square at 1200×1200 px (1:1 ratio). Portrait at 960×1200 px (4:5 ratio) is optional but expands your reach. Max file size is 5MB per image.