Best duplicate file checker for quickly finding duplicates on Windows or Mac?

Absolutely! dupeGuru is an excellent choice if you're looking for a reliable duplicate file checker for both Windows and Mac. 

Key Features
* File Types: Works well with various file types, especially images, music, and documents.
* Scanning Options: Can scan for duplicate files based on filename, content, or both.
* Customizable: You can set the scan criteria, like minimum file size or specific folders.
* Speed: Fast and efficient, even with large collections of files.
* User Interface: Simple and straightforward, suitable for both beginners and experienced users.

How to Use duplicate file checker?
1. Download and install from the official website.
2. Launch the app and select the folders you want to scan.
3. Choose the scan type:
- Standard Mode (filename/content)
- Music Mode (for audio files)
- Picture Mode (for images)
4. Start the scan.
5. Review the found duplicates carefully before deletion.
6. Confirm and delete duplicates to free up space.