can i print double-sided automatically with the canon pixma tr8620a?

Yes, it has built-in 2-sided printing (duplexing).

To use it: The setting is in your print dialog on your computer, not on the printer's physical panel.

1. Open the document you want to print.
2. Go to File > Print.
3. Click 'Properties' or 'Printer Properties' next to the printer name.
4. Look for a setting called '2-Sided Printing', 'Duplex', or 'Print on Both Sides'.
5. Select it and choose your binding orientation (long-edge or short-edge).
6. Print. The printer will automatically print one side, pull the paper back in, and print the reverse.

If it jams during duplexing: Make sure you're using standard weight paper (not too thick or thin) and that the paper is loaded neatly in the tray. Fan the stack before loading.

Heads up: This feature works for documents. For photo paper or specialty media, manual single-sided printing is recommended.