Google's migration tool for moving standalone Display campaigns into Demand Gen started appearing in accounts in June 2026. By January 2027, creating new standalone Display campaigns will be permanently disabled. Auto-migration follows sometime later in 2027, date unspecified.

The migration is one-way. Once a campaign moves to Demand Gen, it can't be reverted to legacy Display. If your B2B SaaS program runs tight remarketing on Display with Manual CPC or Pay for Conversions bidding, you're about to lose those controls with no rollback option.

What Actually Disappears

Demand Gen supports three bid strategies: Target CPA, Target ROAS, and Maximize Clicks. Manual CPC, Viewable Impressions, Pay for Conversions, bid adjustments, seasonality adjustments, and portfolio bidding are all gone. For teams that built Display programs around granular bid control, this is a real reduction in operational leverage.

Business Data feeds, uploaded HTML5 ads, and third-party ads aren't supported yet either. Google says HTML5 and third-party support is planned for late 2026, but "planned" isn't "shipped." Brand Lift and Search Lift studies also don't work for GDN inventory inside Demand Gen campaigns.

The migration tool carries over 42 days of performance history, which Google claims reduces relearning to roughly one to two days. In practice, Google's own documentation warns that performance may fluctuate post-migration, and any budget spent on migration day won't be respected in the new Demand Gen campaign. Budget pacing on day one is effectively uncontrolled.

What You Pick Up

GDN placements are still accessible inside Demand Gen. The gain is additional surface area: Discover, Gmail, Maps, and YouTube inventory, all managed from a single campaign structure. Google reports that advertisers who added GDN inventory to Demand Gen saw an average 9.5% increase in ROI, and that using both image and video assets led to 6% more conversions at the same spend versus images alone. Both numbers are Google-reported, so treat them as directional until you validate in your own account.

View-through-conversion optimization, introduced in April 2026, lets campaigns optimize bids toward users who view a YouTube or Discover ad but don't click and convert later. One catch: as of July 2026, Demand Gen campaigns on Discover using this feature moved from CPC to CPM billing. That changes your unit economics math.

Lookalike Audiences got reworked in March 2026. They now function as "audience suggestions," where Google uses your seed list as a signal and expands beyond your defined parameters. More reach, less control. New segments take up to 96 hours to populate, so build them well ahead of launch.

The Phased Migration Plan That Reduces Risk

Step 1: Audit before anything moves. Export current Display campaign settings. Document conversion goals, exclusion lists, bid strategies, and creative assets. Some won't carry over, and you need to know which ones before migration day.

Step 2: Pick one mid-volume campaign. Don't start with your highest-spend remarketing campaign. Choose something with enough signal to evaluate but low enough risk that a two-week dip won't crater pipeline metrics.

Step 3: Slice budget, don't move it all. Run the migrated Demand Gen campaign alongside the legacy Display campaign briefly. Compare performance against a pre-migration baseline you've already documented.

Step 4: Wait 2–3 weeks before judging. Early volatility is expected. If you pull the plug at day four because CPA spiked, you're reading noise.

Step 5: Measure what matters for B2B. Last-click CPL may look worse during transition. Track assisted pipeline, remarketing pool growth, and conversion quality at the SQL stage. If downstream metrics hold or improve while CPL wobbles, the campaign is working. If both degrade after three weeks, that's a real signal.

The Trade-Off You're Accepting

You're trading granular control for broader reach and multi-surface automation. For B2B SaaS teams with strong creative operations (multiple image variants, video assets, messaging by funnel stage), Demand Gen can outperform legacy Display because it accesses more inventory with smarter bidding. For teams that lack creative throughput, the reach gains may not translate into pipeline because you're showing the same two banners across five surfaces.

That's the real constraint. This migration isn't primarily a media buying problem. It's a creative operations problem dressed up as a campaign structure change.

The hypothesis: if your team invests in asset variety (image plus video, multiple messages per funnel stage) and measures success at the qualified pipeline level rather than last-click CPL, Demand Gen will outperform legacy Display on pipeline contribution within 60 days of stabilization. If you're running two static banners and measuring form fills, it probably won't.

Google's deprecation timeline gives you until January 2027 to migrate on your own terms. After that, Google migrates for you. The difference is whether you chose your settings or inherited whatever the auto-migration tool decided.