Use only the two official e-visa portals
Apply for your e-visa only on evisa.gov.vn and thithucdientu.gov.vn — never a look-alike site.
Those two addresses are the only places a Vietnamese e-visa is actually issued; everything else is a reseller at best. Pay by card on the portal itself, save the PDF, and print a copy — border officers still ask for paper.
Source Official — government portal
Check your permitted stay at the counter
Verify your permitted stay before you walk away — immigration won't change it once you've left the airport.
The stamp in your passport, not your approval letter, decides how long you may legally stay. Read the date at the desk while the officer is still in front of you: corrections are routine there and near-impossible afterwards.
Source Official — Vietnamese decree
Don't trust look-alike visa sites or agent mark-ups
Don't pay an agent a multiple of the official US$25–50 fee — it's the most common visa scam.
The official fee sits at roughly US$25–50 depending on entries. Agents charging several times that are selling you a form you could file in ten minutes, and the least scrupulous keep a copy of your passport scan.
Source Community-reported
Don't overstay — not even a fortnight
Fines now run up to VND40 million and deportation is possible from 16 days over.
Enforcement is administrative and unsentimental: you pay at the airport, on the spot, before you fly. Beyond about a fortnight deportation enters the picture, and an overstay on file sours every future application.
Source Official — Vietnamese decree
Don't assume a tourist visa lets you work
There's no digital nomad visa — working without a permit risks fines and deportation.
Vietnam has no nomad visa. Remote work for a foreign employer sits in an unenforced grey zone; local clients, local pay or a desk in a local office do not — that needs a work permit and a sponsoring entity.
Source Official — Vietnamese decree
Don't count on extending an e-visa from inside
The real extension route is Form NA5, in person, US$10, five working days.
There is no online renewal. You file Form NA5 in person — for Da Nang, at 07 Tran Quy Cap — pay about US$10 and wait roughly five working days. Start well before your stamp expires, and build the trip into your calendar.
Source Official — government portal