> ## Documentation Index
> Fetch the complete documentation index at: https://copy-cat.in/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Limit copy runs to specific file types with filters

> Use extension filters to tell Copycat which file types to index and copy, so only the formats you need appear in results and get delivered.

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.

## How to set up extension filters

<Steps>
  <Step title="Open the Options panel">
    In Copycat, open the **Options** panel. You'll find the extension filter field in the file settings section.
  </Step>

  <Step title="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.
  </Step>

  <Step title="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.
  </Step>
</Steps>

## Common RAW formats by camera brand

<CardGroup cols={2}>
  <Card title="Canon" icon="camera">
    `CR2` (older bodies), `CR3` (R-series and newer)
  </Card>

  <Card title="Sony" icon="camera">
    `ARW`
  </Card>

  <Card title="Nikon" icon="camera">
    `NEF`, `NRW`
  </Card>

  <Card title="Fujifilm" icon="camera">
    `RAF`
  </Card>

  <Card title="Olympus / OM System" icon="camera">
    `ORF`
  </Card>

  <Card title="Panasonic" icon="camera">
    `RW2`
  </Card>

  <Card title="Adobe / Leica / Universal" icon="camera">
    `DNG`
  </Card>
</CardGroup>

## 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.

<Tip>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.</Tip>

<Note>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.</Note>