Low Fill Rate Troubleshooting for Publishers

Introduction

Low fill rate means many ad requests do not receive ads. This article helps publishers find the most common causes.

Check Site and Unit Status

1. Confirm that the site is verified and active.
2. Verify that the ad unit is enabled and not paused.
3. Look for any alerts about policy or quality issues.

[EDITOR: Add screenshot of a dashboard view showing low fill rate for a specific unit]

Review Traffic and Targeting

• Verify that the site is receiving real traffic, not test visits only.
• Consider whether geographic or content restrictions may reduce demand.
• Compare performance by country or device to see where fill is weakest.

Next Steps

• Start with one or two strong placements per page and remove weaker ones.
• Contact support with examples if fill remains very low across all inventory.

Related Articles

• Monitoring Ad Performance in the Publisher Dashboard
• Using Device and Geo Breakdown Reports for Publishers
• Optimizing Ad Density on Publisher Pages
• Troubleshooting Ads Not Showing on Your Site

Updated on: 24/11/2025