• Compressing your files

    We recommend you compress ('zip') your files before sending them to us. Compression makes uploading faster, especially for large files, and allows you to send multiple files as a single compressed file.

    Find out about:

    How to compress files

    You need to compress your files to a .zip file format.

    File compression tools are generally included in operating systems. For example, in Windows 7 and later you would:

    • select your file or files in File Explorer
    • right click and select Send to > Compressed (zipped) folder

    You can also use third-party compression tools, such as WinZip and 7-Zip. (The current version of TrueZip is not supported. An error message 'Compression method 9 not supported' will display.)

    You can only compress a file or multiple files together. Don't include any folders in the compressed file and don't include compressed files within a compressed file.

    Reducing upload times

    The time to upload your file depends on the size of the file and your connection speed. Most lodgments are less than 1MB and should take less than two minutes to upload on a broadband connection. Large files can take significantly longer.

    Compressing your files can reduce the file size up to 10 times, greatly reducing the upload time. For example, a 100MB file may take up to 30 minutes to upload, even on a very fast connection; the same file may compress to just 10MB and send in less than five minutes.

    Large files

    You can use file transfer to test or lodge the full set of data you’re required to report. You don’t need to split the file.

    We strongly recommend that you compress your file to reduce the upload time.

    You don’t need to stay connected to the portal during validation.

    Limitations on file compression sizes

    Standard compression (Deflate) uses a 32-bit algorithm. This algorithm is mainly used by older versions of third-party file compression tools and the File Explorer in Windows XP. The maximum file size is approximately 4GB but Windows XP has a known issue where a zip file can become unreadable and corrupted if the file being compressed is larger than 2GB. The latest versions of third-party compression tools such as WinZip or 7-Zip are recommended for files greater than 2GB.

    Deflate64 compression uses a 64-bit algorithm. This algorithm is supported in the latest versions of third-party tools as well as Windows Vista, Windows Server 2008, Windows 7 and Windows 8. The maximum file size will easily accommodate any lodgment to us.

    Files created from a file larger than 2GB using Windows 7 64-bit (right click and select Send to Compressed (zipped) folder) cannot be unzipped.

      Last modified: 08 Nov 2017QC 26853