Can you undo a merge in Attio?

Not in Attio. The record that loses a merge is deleted, and Attio's documentation states that once a record is deleted it cannot be recovered by you or your team. Records that had previously been merged into the deleted record are not restored either. There is no recycle bin.

Is there any way to reverse an Attio merge?

Only if something captured the records before they were merged. Deduptio snapshots every record in a group before the merge runs, which makes a restore possible for 24 hours: the pre-merge records are re-created with their field values, original value dates and associations. It is a re-creation rather than a true undo, and what it cannot bring back is documented explicitly.

What does a merge restore not bring back?

Notes, tasks, list memberships, emails, calls, activity timeline entries and comments. Attio's merge moved all of these onto the surviving record, and its API does not permit re-creating them on a new record. Restored records are also new records with new IDs and a created date showing the restore. Meetings survive the merge but lose their link and cannot be re-linked by any Attio API.

What can you do if the 24-hour window has passed?

Rebuild from what still exists. The surviving record holds all the merged activity, so nothing was lost from the workspace — what is gone is the separation between the two records. If they should not have been merged, create a new record for the entity that was absorbed and re-link it, using your own export or the merge log for the original field values.

How to undo a merge in Attio

Last checked September 1, 2026 · Deduptio is our product. Every claim about another tool comes from its public site or documentation and is linked in place — tell us if something is out of date.

The short answer

Attio has no undo for a merge. The losing record is deleted, and Attio's own documentation says a deleted record cannot be recovered by you or your team. Reversing a merge is only possible if something snapshotted the records beforehand — and even then it is a re-creation, not a true undo.

Why there is nothing to undo

A merge in Attio is not a reversible transformation. Two records go in, one comes out, and the other is deleted. Everything attached to it — notes, tasks, emails, calls, list entries — is not deleted but movedonto the survivor. The information is still in your workspace; what has disappeared is the boundary that said which half belonged to which record. Even with a full backup of both records, that boundary is not straightforward to reconstruct, because Attio's API will not let you re-create a note or an email thread on a different record.

So "undo" splits into two very different questions: can the deleted record come back, and can its history come back with it? The first is answerable. The second, mostly, is not.

What a snapshot-based restore actually recovers

Deduptio snapshots every record in a group before the merge and keeps it for 24 hours. Here is the honest inventory of what a restore does — the same table applies to any tool working within Attio's API, ours included:

After a restore	What happens
Field values	Restored, including original value dates — a stage that changed in March still shows March, not the day of the restore
Associations to other records	Restored from the snapshot
Notes, tasks, comments	Not restored — they moved to the survivor and cannot be re-created elsewhere
Emails, calls, activity timeline	Not restored, for the same reason
List memberships	Not restored
Meetings	Survive the merge but lose their link, and no Attio API can re-link them. The restore reports how many there were; they stay searchable by date and participant
Record identity	Changed. Restored records are new records with new IDs, and a created date showing the restore rather than the original
Required status or select attributes with no snapshot value	Filled with the attribute's first live option, and the substitution is reported — a restored deal can come back at a different stage

Full detail, including how restores interact with Attio workflows, is in rollback and safety. It is worth reading before you need it rather than during.

If the window has passed

Nothing was lost from the workspace — the surviving record holds every note, email and task from both. What you have lost is the separation. To rebuild:

Find the original field values. Your own pre-cleanup export is the best source. A merge log, if your tool keeps one, records what was merged and when even after the snapshot expires.
Create a fresh record for the entity that should not have been absorbed, with those values.
Re-link the relationships — people to the right company, deals to the right account.
Accept that the history stays on the survivor. Old emails and notes cannot be split back out. Leave a note on both records explaining what happened, so the next person does not have to guess.

The habits that make undo unnecessary

Dry-run first. A preview that writes nothing is free on every Deduptio plan and shows what each merge would do.
Export before a big cleanup. Record IDs, identifying fields, list membership and timestamps. A rollback window is not a backup.
Merge in batches. Ten, verified, then the rest. A wrong rule caught after ten merges is a nuisance; caught after a thousand it is an afternoon of rebuilding.
Skip the ambiguous ones. An unmerged duplicate is an annoyance. A wrong merge is data loss. If you cannot tell, leave it.

Merge with a way back

Connect your Attio workspace, write one match rule, and run a scan. Scans are read-only — you see every group and the reason it matched before anything is merged.

Start a free Attio duplicate scan

How to merge records in Attio — the operation this page is about undoing.
Deduptio vs Attio's native merge — the no-undo problem, stated as a comparison.
Rollback and safety · The full guide