> For the complete documentation index, see [llms.txt](https://docs.nifty.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nifty.ai/inventory-management/finding-and-fixing-duplicates.md).
# Finding and Fixing Duplicates
When Nifty detects that a listing is posted more than once on the same marketplace, we mark it as a **Duplicate** for you to review. Here's how to find and fix them.
### Where to find duplicates
Go to the [**Inventory Manager**](/inventory-management/inventory-manager.md) and click the **Duplicates** filter in the **Filter bar**.
[**Duplicates**](https://app.nifty.ai/inventory?filter=duplicates) shows items Nifty suspects might be duplicates based on similar titles or images.
### Why duplicates happen
**External relists:** When you relist using another tool or directly on a marketplace (like eBay's "end and sell similar"), Nifty pulls in the new listing but doesn't know it's the same item as the old one. You end up with two rows — one where the listing is **Listed** and another where it's **Delisted**.
**Human error:** An item is listed twice by a human.
**Software error:** An item is listed twice by software. This is a [known issue on Mercari](/marketplace-guides/selling-on-mercari.md#duplicate-listings) — when listing via their API, sometimes two listings are created instead of one.
### How to fix duplicates
{% hint style="warning" %}
**Important:** Before fixing duplicates, run a **Full Sync** so you're working with the latest data. See [Sync and Refresh](/inventory-management/sync-and-refresh.md) for details.
{% endhint %}
For each group that Nifty surfaces for your review, you have three main tools:
1. **Drag and drop** — drag and drop the photos to rearrange the listings as needed.
2. **Delist** — use the **Delist listings** button or **Item menu** to delist all of the listings on a given row. This removes them for sale from the marketplace.
3. **Dismiss** — once you've addressed the issue (or if there's nothing to address), click **Not a duplicate** to dismiss the warning. This button removes the group from your view.
### Why this matters
Duplicates directly impact [**Auto-Delisting**](/auto-delisting/auto-delisting.md). If the same item exists on two separate rows, selling it on one marketplace won't trigger delisting on the others — because Nifty doesn't know they're connected.
---
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