Help › File Operations › Split & Join

Split & Join

The Split and Join commands let you break a large file into smaller pieces and reassemble them later. This is useful when you need to transfer files that exceed size limits for email attachments, USB drives, or other media.

Splitting a File

  1. Right-click on the file you want to split.
  2. Choose FilerFrog → Split File.
  3. Specify the maximum size for each piece (e.g., 10 MB).
  4. Click OK. FilerFrog divides the file into numbered parts.

The resulting pieces are saved in the same folder as the original file. Each piece has a .ffs extension (FilerFrog Split) followed by a sequence number, for example: report.pdf.ffs.001, report.pdf.ffs.002, and so on.

Joining Files

  1. Right-click on the first piece (the .ffs.001 file).
  2. Choose FilerFrog → Join Files.
  3. FilerFrog automatically locates all remaining pieces and reassembles the original file.

The .ffs Extension

FilerFrog uses the .ffs extension to identify split file parts. The extension preserves the original file name, so you can always tell what file the pieces belong to. When joining, FilerFrog reads the sequence numbers to reassemble the parts in the correct order.

Example

You need to email a 25 MB video but the email provider limits attachments to 10 MB. Split the video into 10 MB pieces, send each part as a separate attachment, and the recipient uses FilerFrog's Join to reconstruct the original video.

Tip: Make sure all split parts are in the same folder before joining. FilerFrog needs to find every piece to successfully reassemble the file.

Checksum Verification

When splitting a file, FilerFrog now stores a CRC32 checksum in the first piece. When joining, the checksum is automatically verified to detect any corrupted or modified pieces. Files split with older versions of FilerFrog are still fully supported.

Progress Tracking

The progress bar now updates smoothly based on actual bytes processed, giving you accurate feedback even for very large files.