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MJ Marketing
Campaign Optimization

A/B Testing

In short

A/B Testing compares two variants (e.g., ad copy, landing pages) against each other to determine the better version based on data.

In-depth guideGoogle Ads: 20 Practical Optimization TacticsRead the article

What is A/B Testing?

A/B Testing compares two variants simultaneously to find which performs better. In Google Ads: two ads with different headlines or CTAs run in parallel — the better performer wins.

What Can Be Tested?

  • Ad copy: headlines, descriptions, CTAs
  • Landing pages: headlines, images, form length
  • Bidding strategies: Target CPA vs. Maximize Conversions
  • Audiences: different targeting options

Rules for Valid Tests

1. Change only one variable at a time. 2. Collect enough data (100+ clicks per variant). 3. Check statistical significance.

Pro Tip: Start with ad copy testing — easiest and often highest impact.

Further resources

Frequently Asked Questions

At least 2-4 weeks or until you have 200+ clicks per variant. Shorter tests don't produce statistically significant results.

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