January 1, 2026January 1, 2026| Soni YorkSoni York|
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Question:

We deal with files of rather large sizes (for example, 250MB). What is the maximum size of files that can be routed, attached to a Spitfire document, or uploaded to the Spitfire Catalog?

Answer:

Theoretically, the maximum file size is over 1GB and Spitfire can easily work with files in the 500MB range. Such large files can be uploaded onto a document (and thus into the Catalog) through drag-and-drop. However, your site may have been configured to limit the maximum file size to 80MB or some other number as a matter of policy years ago. In addition, hardware resources might limit the maximum file size.

To change the maximum file sizes allowed to be uploaded on your site:

  1. Go to the Rules Maintenance tool on the System Admin Dashboard.
  2. Expand the FileCatalogConfig rule group.
  3. Add or edit the UploadMaxKB rule.  In the Result Value, specify the maximum KB file size to be accepted for a single file upload.  The default is 1,024,000. The maximum is 2,048,000 KB  (which equivalent to 2048 MB).

To change the maximum file size to be routed:

The following RouteConfig rules establish maximum files sizes used in assembled PDFs and outbound email.

  1. Go to the RouteConfig rule group in the Rule Maintenance tool on the System Admin Dashboard.
  2. Add or edit the following rules, indicating as the Result Value the maximum size allowed (in KB).
    1. MaxAssembledKB = the maximum file size of the PDF once assembled.
      (Default is 8192 KB)
    2. MaxAssembledFileKB = the maximum size of each file to be included in an assembled PDF.
      (Default is 2355 KB)
    3. MaxSendKB = the maximum outbound email file size.
      (Default is 8192 KB)
  3. Save your rules.
    Note: the MaxSendKB will not take effect until the system is recycled and the sfATC service is restarted.

For example:

Additional Comments:

Keep in mind that it is common for mail gateways to reject attachments over 16MB. Some will even reject 8MB or less. That is why Spitfire includes a link to a download wizard when attached files are larger than 8MB (or whatever has been configured for your site).

By default, the download wizard is accessible to anyone with the encoded link. In fact, the download wizard has advantages over email: since each routed person on each document sequence gets his or her own private link, the system can record the date and time that the files were downloaded by each party.

See also Download Wizard Options.

KBA-01902: Maximum File Sizes; Last updated: January 14, 2026 at 9:41 am

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