In order to enter Canada, you may need one of the following documents:
- A visa
- An Electronic Travel Authorization
You can also look at the two following lists:
- Countries and territories whose citizens need a visa to travel to Canada
- Countries and territories whose citizens need an eTA to travel to Canada
U.S. citizens (except lawful permanent residents, if travelling by air), Canadian citizens (including those with a dual citizenship), and Canadian permanent residents cannot apply for an eTA. Those with a valid visa do not need to apply for another one.
 Electronic Travel Authorization
Applying for an eTA takes only a few minutes. Please make sure that you have a valid passport and credit card.
 Visitor Visa
Ideally, please apply for a visa approximately 12 weeks in advance to ensure you receive it in time.
Note that your visa application's chance of success could be helped by providing documentation such as:
- Travel bookings, return flight
- Itinerary of visit
- Confirmation of registration to DebConf
- Evidence showing that you can support yourself financially while in Canada
- Evidence of current employment or enrollment in education in your home country
Unfortunately, the only way to open the visa form provided by the Canadian government is to use Adobe Reader. Unfortunately, it is a proprietary tool that no longer works on Linux. You can either use an old version, Wine, MacOS, Windows or Android to fill out the form.
 Letter of invitation
In some cases, you may need a letter of invitation or be asked for one to simplify your application process.
If that's the case, please e-mail firstname.lastname@example.org, with the following:
- Complete name
- Telephone number
- Passport number
- Your place of stay (on-site accommodation, hotel...)
- If you received a bursary, specify which one it is (food & accom., travel, or both)
Note that a letter of invitation does not guarantee you a visa.