Is there any size limit on the files that users can upload to my Google Drive™ through DriveUploader?

There is no upload size limit. The only technical limit is available disk size on your Google Drive™ account. Google offers an unlimited plan.

If you want to set a limit on the size of the file which people can upload, you can do that in your web application which is using the DriveUploader via the JavaScript API, see the Filtering files example.

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