A:AnswerUnfortunately, the previous community answer is inaccurate.
We have confirmed that this charger is not compatible with the Samsung XE303C12.
David M. - Insignia Support
A:AnswerHello David, please contact us at 877-467-4289 with the complete model so we can find the correct adapter and tip needed for this specific model. Omar S. - Insignia Support.
A:AnswerHello Joe, this adapter will work prefect with your laptop by using the tip number #9 which is included on the box!. Omar S. - Insignia Support.
A:AnswerHello B, please contact us at 877-467-4289 with the complete model so we can find the correct adapter and tip needed for this specific model. Omar S. - Insignia Support.