By default Web Print accepts upload of files with a size limit of 20 MB.

If you like to change this value, here what to do:

1. Stop EveryonePrint Web service
2. Open EveryonePrint program folder (default : %ProgramFiles(x86)%\EveryonePrint )
3. Make a backup copy of 'eop.xml' file
4. Edit 'eop.xml' file in a text editor like notepad or similar
5. Locate this tag and change the value (MB) :<webmaxupload>20</webmaxupload>
6. Save eop.xml
7. Restart EveryonePrint Web Service

It may not cause trouble, but adding workload on the server to process heavy files; you can monitor performance and adjust accordingly.