tab (or the Files view), click the **Tools** menu and choose **Duplicate Document Finder**.
2. The first time you use the finder in a matter, click **Activate** when prompted ("Activate duplicate document agent feature? This is currently in BETA so being offered for FREE"). Only the matter's owner can activate the agent; if you have shared (non-owner) access, ask the owner to activate it once for the matter.
3. In the dialog, set the **Similarity Threshold** (default **70%**) and click 
. The finder returns document pairs at roughly 70% similarity or higher; raise the threshold to narrow the results to closer matches. BriefTech lists candidate **pairs** in a table: Document A, Document B, and a similarity score. (Use **Export to CSV** if you want the full list.)
4. For any pair, click **Compare** to see the two documents side by side, then click 
on the copy you want to remove. Repeat for each pair you want to resolve.
Binned documents are excluded from the check, so once you move a copy to the bin its pair no longer appears in the results.
You don't have to open **Compare** to remove a copy. Back in the matter's document list (the **Review** tab or **Files** view), you can tick a copy's row — or several rows — and choose 
from the right-click menu, which confirms before binning. (The finder's own results table doesn't offer row-ticking, so bin from **Compare** while you're inside it.)
Binned documents can be restored from the 
view — open it, select the documents, and click **Restore**. To remove them for good, select them in the Bin and click **Delete**.
You now have the matter's duplicate pairs reviewed, and the copies you didn't need moved to the bin.
## Same-filename warning at upload
If some files in an upload batch share a filename with a document already in the **same folder** of the matter, the Upload Manager shows a **Duplicate Files Detected** warning before the batch lands. You can:
* **Exclude Documents with the same filename** — drop the same-named files from this batch, or
* **Upload them anyways** — keep them; this creates additional copies alongside the existing documents.
This warning only compares file names within the same folder. To catch duplicates that have different names, run the **Duplicate Document Finder** after upload (above).
## Related
| Folders, labels, and collections | How folders, labels, and collections organise documents in a matter. | Folders, labels, and collections |
| Organise documents into folders | Create folders and move documents between them. | Organise documents into folders |
| Apply labels to documents | Create labels and apply them to documents in bulk. | Apply labels to documents |
| Group documents into a collection | Segment your document set into collections. | Group documents into a collection |