What This Update Actually Is
HubSpot shipped a new full-screen merge preview inside the Duplicates Management tool. It's specifically built for humans using custom duplicate detection rules.
The old preview was bare-bones. You could see two records side by side, pick a winner, and hope for the best. The new preview changes that completely.
Here's what the new experience gives you:
- A full-screen view showing every record in the duplicate group, not just two at a time
- A clear label at the top identifying which custom rule surfaced this duplicate group
- A customizable property table so you can add the fields you actually care about for review
- Manual property override selection so you can cherry-pick the best value from any secondary record to carry forward on the winner
- A live winning record preview on the right side of the screen before you execute the merge
One important note: HubSpot rolled back making this the default experience for all duplicate detection methods. Right now, it only appears when the duplicate was surfaced by a custom detection rule. The HubSpot AI model still uses its existing preview, which only compares two records at a time. That will change soon, but it hasn't yet.
Why HubSpot Shipped This
Duplicate records are one of the most painful data problems in any CRM. We've seen it in portal after portal: a sales rep merges two contacts, the wrong record wins, and critical notes or deal history disappear. There's no undo.
The external problem is straightforward. Duplicate records corrupt reporting, break segmentation, and waste time. The internal frustration is real too: humans managing duplicates at scale feel like they're flying blind. The old tool didn't give you enough context to merge confidently.
Custom duplicate rules make this worse before they make it better. When you build a rule that flags groups of three, four, or five records, reviewing each pair individually becomes impractical. The new preview closes that gap directly.
How to Use It Step by Step
Follow these steps to take advantage of the new merge preview:
- Go to your HubSpot portal and navigate to Contacts, Companies, or Deals depending on where your duplicates live.
- Open Actions and select Manage Duplicates, or go to Data Management and find the Duplicates section.
- Filter your duplicate queue to show duplicates surfaced by custom duplicate detection rules. These are the groups that will trigger the new preview.
- Click into a duplicate group and select the option to merge. The new full-screen preview will open automatically.
- Review the table at the top to confirm which custom rule flagged this group. This tells you exactly why these records were matched.
- Add any properties you want to compare by customizing the table columns. Don't just review the defaults.
- Select the winning record. Then, for any property where a secondary record holds better data, manually override that field so the winning record inherits the right value.
- Check the winning record preview on the right side of the screen. Confirm it looks correct before you execute.
- Execute the merge. The secondary records are archived and the winning record is updated with your chosen property values.
What It Touches in Your HubSpot Strategy
This update lives inside the Smart CRM layer but it ripples into almost every hub you run.
Contact and company data quality is the foundation of everything: enrollment in workflows, segmentation for email, deal associations, and service ticket routing. Bad merges corrupt all of it. The new preview reduces the risk of a bad merge at the moment it matters most.
Key Takeaway
Every workflow that uses contact properties, every list that filters on company data, and every report that counts unique records is downstream of your duplicate merge decisions. Getting merges right is a RevOps discipline, not a one-time cleanup task.
If you're running a HubSpot-Salesforce sync, this matters even more. Duplicate records that get merged incorrectly inside HubSpot can create sync conflicts, orphaned records, or data overwrites on the Salesforce side.
If you're thinking about sync hygiene, our breakdown of HubSpot's Salesforce integration rebuild is worth reading alongside this update. Cleaner merges now mean fewer problems when the new sync engine rolls out.
On the operations side, if you've invested in custom duplicate detection rules, this preview is your payoff. Custom rules let you define match logic that HubSpot's AI model doesn't cover, like matching on a custom external ID or a subsidiary domain pattern. The new preview makes sure that precision carries through to the merge itself.
Key Takeaway
Custom duplicate detection rules without a confident merge workflow are only half the solution. This update completes the loop: define the rule, surface the group, review the full picture, and merge with certainty.
One underrated benefit: cleaner merges directly reduce your marketing contact count. Duplicate contacts that get resolved properly don't inflate your tier. If you're also working to control costs, pair this with HubSpot's marketing contact limit controls for a tighter grip on your database.
Who Should Care Most
This update matters most to the following roles and team profiles:
- RevOps leads and HubSpot admins who built custom duplicate detection rules and are responsible for data quality across the CRM
- Operations managers at companies with large contact databases where a single bad merge has downstream consequences in reporting, automation, and billing
- Marketing ops humans who manage list segmentation and know that duplicate records silently break audience accuracy
- Growing companies on Smart CRM, Sales Hub, Marketing Hub, Service Hub, Content Hub, Data Hub, or Commerce Hub at Professional or Enterprise tier, since that's the full availability list for this feature
If you haven't set up custom duplicate detection rules yet, this update is a strong reason to start. The preview experience is substantially better than the AI model's current two-record comparison.
George's Take
I've been inside hundreds of HubSpot portals, and duplicate record cleanup is almost always deferred because it feels risky. Humans don't want to merge records they can't fully see. They're afraid of losing data, picking the wrong winner, or breaking an integration. That fear is completely rational. The old merge experience didn't give you enough information to act confidently, so teams either merged blindly and hoped for the best, or they avoided the queue entirely and let the problem compound. This new preview removes that fear at the point of action. It doesn't just show you more data; it gives you control. That's the difference between a tool humans avoid and one they actually use.
“Duplicate cleanup doesn't fail because humans don't care about data quality. It fails because the tool never gave them enough confidence to act. This preview changes that.”
If you're building out your data operations stack more broadly, it's also worth checking what's come into the HubSpot Marketplace in Q2 2026. Several new data enrichment and hygiene tools landed that pair well with better duplicate management.
If your duplicate queue has been sitting untouched because the process felt too risky, now's the time to revisit it. And if you want a second set of eyes on your custom duplicate rules or your broader data hygiene strategy, book a strategy call with the Sidekick team. We'll look at what you have, find what's costing you, and help you fix it in a way that sticks.
Frequently Asked Questions
What is the new HubSpot merge preview in duplicates management?
It's a full-screen preview that appears before you merge a duplicate group. It shows every record in the group, lets you customize which properties to compare, lets you manually select which property values carry over to the winning record, and displays a live preview of the winning record before you execute the merge.
Which HubSpot plans include the new merge preview?
The new merge preview is available on Professional and Enterprise tiers across Smart CRM, Marketing Hub, Sales Hub, Service Hub, Content Hub, Data Hub, and Commerce Hub. It's not available on Free or Starter plans.
Does the new merge preview work with the HubSpot AI duplicate detection model?
Not yet. As of July 2026, the new full-screen merge preview is only available for duplicates surfaced by custom duplicate detection rules. HubSpot has indicated the new preview will replace the AI model's existing two-record preview soon, but that change hasn't shipped yet.
Can you manually choose which property values survive a HubSpot duplicate merge?
Yes, with the new preview you can. After selecting the winning record, you can manually override individual property values by choosing data from any secondary record in the group. The winning record preview updates in real time so you can confirm your selections before executing the merge.
How is the new merge preview different from the old one?
The old preview only showed two records at a time and gave limited control over property values. The new preview shows the entire duplicate group at once, identifies which rule flagged the group, lets you add custom properties to the comparison table, and lets you manually select property overrides before merging.
Why should RevOps teams care about better duplicate merge previews?
Bad merges corrupt contact data, break workflow enrollments, skew reports, and inflate marketing contact counts. A confident merge preview reduces the chance of losing critical data to a secondary record. Better merges mean cleaner segmentation, more accurate reporting, and fewer downstream problems across every hub you run.
