What are the file sizes supported by Office Online?

The explicit limits, where applicable, are listed in the table below. However, note that there is a 60-second file download time out that applies to all GetFile operations, and this time out can affect the perceived file size limit. In practice, this time out is rarely hit, since connectivity and bandwidth is typically very good between Office Online and host datacenters. However, hosts should be aware of this limit.

Tip

The FileUrl property can be set to change the URL that Office Online will use to download files from the host. This can be used to increase download speeds depending on the host’s architecture.

Table 8 File size limits
Application Mode Limit Notes
Excel Online View 5MB  
Excel Online Edit 5MB  
PowerPoint Online View See notes No limit, but subject to the 60 second time out for file downloads as described above.
PowerPoint Online Edit 300MB While the upper limit is 300MB, this is still subject to the overall 60 second time out for file downloads so it is possible that smaller files will hit that timeout.
Word Online View See notes No limit, but subject to the 60 second time out for file downloads as described above.
Word Online Edit See notes The technical limit is 100,000,000 (100 million) characters in the document XML; however, this does not correlate with file size in a meaningful way. For example, a 1000-page document, hundreds of MB in size does not hit this limit. For the vast majority of use-cases, this limit is irrelevant.