how to move canadian quickbooks desktop to canadian quickbooks online when I don't have quickbooks desktop just the file?

You can download the QuickBooks Desktop (QBDT) Enterprise free trial, ontariooyf.

First off, before downloading the QBDT Enterprise free trial, ensure you create a backup of your existing file to protect your data from potential issues or corruption during the conversion process.

Next, confirm that your computer meets the minimum requirements for installing QBDT Enterprise 24.0.

Once you have a QuickBooks Online (QBO) subscription, keep in mind that you have 90 days from the creation of your QBO account to migrate your data. If you are uncertain about the age of your company, you can sign in and refresh the page to update the information.

When you're ready to move a file from QBDT to QBO, follow these steps:

1. Sign in as an admin to the company file you need to import.
2. Go to the Company menu, then select Export Company File to QuickBooks Online.
3. Click Start your export.
4. Sign in as an admin to your QBO company.
5. Select the Choose online company drop-down, and select the QBO company you want to replace your company file.
6. Click Continue.
7. Enter Agree in the text field, then select Replace.
8. Select Yes, go ahead and replace the data, then click Replace.

You can also read this article for the complete details: Move your QuickBooks Desktop file to QuickBooks Online.

The Community always has your back if you require further assistance with migrating your data or any QuickBooks-related concerns.

@ontariooyf 

Which QB Desktop year version?