What Is Event Match Quality and Why Does It Need to Be HighUpdated 5 days ago

Event Match Quality (EMQ) is a score Meta assigns measuring how accurately purchase events from the store can be matched to real Meta users — directly determining how well the advertising algorithm can optimize toward buyers most likely to convert.

EMQ is measured from 0 to 10. A score below 6 means a significant percentage of purchase events cannot be matched to real Meta users — the algorithm cannot learn from those conversions. A score of 8 or above means most events are matched correctly and the algorithm has high-quality data to optimize from.

What affects EMQ and how I improve it during the tracking setup:

Customer information match signals — EMQ improves when purchase events include customer data alongside the conversion signal: email address, phone number, name and browser identifiers. More signals means better matching.

Hashed data transmission — customer data must be hashed before being sent to Meta for privacy compliance. Unhashed data violates policy and does not improve the score.

Conversions API contribution:

• CAPI sends server-side signals that include richer customer data than browser-side Pixel events alone
• Adding CAPI alongside the Pixel is the most reliable way to raise a low EMQ score
• Combined browser and server signals consistently produce higher EMQ than either source alone

I verify the EMQ score during setup and optimize the configuration until the highest achievable score is reached.