AI Voice-Over in Performance Max: What the Setting Controls and When to Turn It Off

What the setting is, and what it controls

The campaign control is under Campaign settings → Asset optimization → Video → Enhancement. It covers more than narration. Google's API documentation lists Performance Max video enhancement as enabled by default; inspect the actual setting before assuming what your campaign allows.

To remove a particular system-generated version, Google's Help page directs advertisers to Assets in the Campaigns menu, then Edit → Remove. That is different from switching off enhancement for the campaign. Check the resulting asset state and subsequent delivery rather than treating a click as proof the unwanted version stopped.

This is also separate from building a video automatically when an asset group has none, and from deliberately adding a script with Asset Studio's voice-over tool. The Performance Max video guide separates those paths.

The key input is your text. A short headline may make sense next to a product card and sound misleading when read over a different video. Review the combination, not the sentence in isolation.

What a generated voice-over can say

Because the source is your text assets, the failure modes are predictable. A headline written for a small slot, such as a promotional line that expires next week, becomes a spoken claim for as long as the enhanced video runs. A description with a qualifier in the second half loses it if the voice-over uses only the headline. A brand name spelled unusually may be pronounced wrongly. A text asset shared across asset groups is read over videos it was never written for.

A hypothetical: a pet food brand's Performance Max asset group carries the headline Vet-formulated for sensitive stomachs and the description Free delivery on orders over 40 pounds. The enhanced version of its 15-second product video opens with a synthetic voice reading the headline over a shot of the standard range, not the sensitive-stomach line, because the video was uploaded to the range-wide asset group. Nothing in the setting is wrong; the text assets and the video did not belong together. The fixes are to move the video to the asset group whose text matches it, or to remove that enhanced asset.

The other predictable failure is the video that already had audio that mattered. Help says voice-over is added to videos that do not already have one; a video with music and on-screen captions but no speech qualifies. If the captions and the spoken headline disagree, viewers hear one thing and read another.

Where enhanced videos show up in reporting

Google documents enhanced-video visibility in asset-group, campaign-asset and channel reporting. Open the actual versions there: identify what was added, listen to it, and look at the delivery it received. Google's advanced-controls page discusses experimentation in forward-looking terms; the currently documented asset tests should not be mistaken for a dedicated test of the enhancement switch.

A vertical version serving on Shorts and a horizontal original may reach different audiences in different auctions. Their asset rows are not a controlled comparison. They can still answer the immediate question: did the version with the wrong spoken claim receive impressions?

A short check before you decide

• Listen to the enhanced versions, not just the originals. Note the exact line and product shown when something is wrong.
• Read conditional or time-limited text with its qualifier. A delivery threshold or limited offer can become misleading when separated from its context.
• Compare captions with the spoken track. Viewers should not have to choose which claim to believe.
• Decide whether the useful adaptations justify keeping enhancement enabled, or whether you need to supply only finished creative.
• After changing the text or removing a version, inspect the resulting assets again. Do not assume the earlier preview still describes the current ad.

Keep, prune, or turn off

Leave the setting on when the resulting versions are accurate and useful. Remove a specific version when the problem is isolated. Turn enhancement off when control over the finished edit matters more than Google's adaptations, for example a tightly approved script and picture sequence that must remain together. Having your own narration is not, by itself, a reason to discard useful crops or shorter edits.

Revisit this when the offer, text or footage changes. A mandatory weekly review would add work without explaining what new risk you are checking.