The Cache folder in Capture One

When working in Capture One, the software creates support files that make browsing and editing faster. These files are stored inside each Session or Catalog, and one of the key components is the Cache folder.

What is the Cache folder?

The Cache folder stores temporary files that allow Capture One to quickly display and edit your images.

It typically includes:

• Thumbnails subfolder → Small previews for grid browsing (.cot files).

• Previews subfolder → Larger, medium-resolution previews for zooming without reloading the RAW file (.cop files). Can also contain .cof files - Focus Mask information

• Browser subfolder (Windows only) → it contains .bc files (browser cache) that speed up thumbnail loading in large collections and can be safely deleted, as they will be recreated automatically.

Where is it located?

• Session workflow: Inside each Session folder, you will find a CaptureOne folder. Within it, the Cache folder is created alongside other support folders.

• Catalog workflow: The Cache is stored inside the Catalog itself. 
  On macOS: Right-click the Catalog file (.cocatalog) and choose Show Package Contents → you’ll see a Cache folder.
  On Windows: Open the Catalog folder in Explorer → a Cache folder is inside the Catalog directory.

Can I delete the Cache folder?

Yes, but here are some things you should know:

• Deleting the Cache does not remove your images or adjustments.

• Capture One will rebuild thumbnails and previews the next time you browse the Session or Catalog.

• Rebuilding can take time depending on the size of your library.

This is sometimes useful if previews appear corrupted or you want to free up disk space – either temporarily or for a backup.

Best practices

• Keep the Cache inside the CaptureOne folder; do not move it elsewhere.

• Only delete it if necessary (e.g., to fix corrupted previews or reduce storage usage for a backup to an external drive or elsewhere).

• For best performance, let Capture One manage the Cache automatically.