Upverter experimentally supports Altium import.
Disclaimer: The feature is still under heavy development, there may be issues with the import process.
Save to a supported Altium file format
Upverter supports Altium's default file format (Advanced Schematic version 5.0). Both the binary and the Ascii versions of the file format are supported. If you are using a non-standard file format, please convert your project to the default file format.
Zip project folders
If you would like to import a full project from Altium, you will need to create a Zip file containing all of the files in the project. The schematic files and the project files should all be at the top level of the Zip file. There should be no other folders in the Zip file.
If you only wish to import a single schematic, you do not need to create a Zip file. Simply upload the single schematic file you wish to import.
Import to Upverter
Select Import from your Dashboard page, and upload the file.