# Merging Duplicates: Merge Rules and History | Dedupely

> Merge options, Merge Rules, match and merge limits and Merge History: what a merge keeps, what it changes, and how to check every change it made afterwards.

- URL: https://dedupe.ly/knowledge-base/merging-duplicates
- Section: knowledge-base
- Site index: https://dedupe.ly/llms.txt
- Any page: append `.md` to its URL for this plain-text form

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## Merging duplicates

The merge engine: merge options, merge rules, safety limits and history.
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[Merging duplicates Merge duplicates in Dedupely one at a time, in bulk, or on a schedule with Auto Merge, with safety limits and Merge Rules deciding what every merge keeps.](https://dedupe.ly/knowledge-base/merge-duplicates)
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[Merge Rules Merge Rules decide field by field which value survives a merge. Set them once, override your CRM's native logic, and keep the data you actually wanted.](https://dedupe.ly/knowledge-base/merge-rules)
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[Merge Safety Match limits and merge limits cap how large a duplicate group can get before Dedupely stops and asks you to review it, so no bulk merge ever runs away.](https://dedupe.ly/knowledge-base/merge-safety)
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[Merge History Every merge Dedupely runs is recorded in Merge History. View it, search it, export it, and see exactly which record survived and which values it kept.](https://dedupe.ly/knowledge-base/merge-history)
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[Merging duplicates with an active HubSpot-Salesforce Integration Dedupely detects an active HubSpot-Salesforce Integration and merges in both CRMs at once, so the next sync cycle cannot rebuild the duplicate you merged.](https://dedupe.ly/knowledge-base/merging-duplicates-with-an-active-hubspot-and-salesforce-sync)
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[Merge duplicates in spreadsheets Upload a CSV or Excel file to Dedupely, sync it, and merge the duplicate rows before the data ever reaches your CRM. No formulas and no manual review.](https://dedupe.ly/knowledge-base/connect-csv)

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Feeding it the whole site?
[Read llms.txt](https://dedupe.ly/llms.txt)

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