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By default, Copycat indexes every file it finds in your source folder. Extension filters let you narrow that down to specific file types — so if you only want to copy RAW files and ignore JPEGs, sidecars, or video files, you can set that up once and Copycat will remember it for every subsequent run.

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How to set up extension filters

1

Open the Options panel

In Copycat, open the Options panel. You’ll find the extension filter field in the file settings section.
2

Enter the extensions you want to include

Type the file extensions you want Copycat to match. Enter them without a leading dot — for example, CR3, ARW, NEF.You can enter multiple extensions. Copycat will include any file whose extension matches any entry in the list.
3

Save your settings

Save the Options panel. The filters take effect on your next copy run — only files whose extension matches the list will appear in results and be eligible for copying.

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Common RAW formats by camera brand

Canon

CR2 (older bodies), CR3 (R-series and newer)

Sony

ARW

Nikon

NEF, NRW

Fujifilm

RAF

Olympus / OM System

ORF

Panasonic

RW2

Adobe / Leica / Universal

DNG

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Things to know

Extension matching is case-insensitive. You don’t need to add both CR3 and cr3 — entering either one will match files with that extension regardless of how the camera wrote it. Filters apply at the indexing stage. When Copycat scans your source folder, it skips any file that doesn’t match the filter list. Files that aren’t indexed won’t appear in results and can’t be copied, even if they’re physically present in the folder. Clearing filters restores full indexing. Remove all entries from the filter field and save to go back to indexing every file type in the source folder.
If you work with mixed archives that contain both RAW and JPEG files, add both extensions (e.g., CR3 and JPG) so clients can receive either format depending on what you shot.
Extension filters don’t apply to the destination folder — Copycat only filters what it indexes from the source. Files already in the destination are not affected.