SofiLingoSofiLingo
Vietnamese

Translate Vietnamese, tone marks and all.

By , Caddora · Updated

Vietnamese is where a single mark above a letter is the difference between bread and cake. Your iPhone can read it on its own and does drop those marks; with a connection it does not. So the camera uses a connection when there is one, and your phone when there is not — and this page shows you exactly what that is worth.

Try 15 free translations No card, no sign-up · iOS 15.5 or later

Typing works with no signal

Download the Vietnamese pack once, over hotel wifi, and typed translation runs on the phone from then on — as it does in all 58 languages.

The camera reads it better online

Your iPhone can read Vietnamese on its own, and reads it more accurately with a connection — so it uses the connection when there is one and the phone when there is not.

Speech depends on your iPhone

Spoken translation uses Apple's own speech packs, which cover about half of these languages and differ from phone to phone — so the app tells you if it cannot hear Vietnamese rather than failing while someone waits. How speech works.

One mark, and the bread becomes cake

This is the same printed menu, read by the phone on its own and read with a connection. The Vietnamese is known because we printed it.

A restaurant menu

Printed on it

  1. Thực đơn hôm nay
  2. Súp rau với bánh mì
  3. Gà nướng với khoai tây
  4. Cá tươi trong ngày
  5. Bánh sô cô la
  6. Đã bao gồm cà phê và trà

The phone on its own

Read as

  1. Thực đơn hôm nay
  2. Súp rau với bánh mi
  3. Gà nướng với khoai tây
  4. Cá tươi trong ngày
  5. Bánh sô cô la
  6. Đã bao gồm cà phê và trà

Gave back

  1. Today menu
  2. Vegetable soup with cake
  3. Grilled chicken with potatoes
  4. Fresh fish in the day
  5. Chocolate cake
  6. includes coffee and tea

With a connection

Read as

  1. Thực đơn hôm nay
  2. Súp rau với bánh mì
  3. Gà nướng với khoai tây
  4. Cá tươi trong ngày
  5. Bánh sô cô la
  6. Đã bao gồm cà phê và trà

Gave back

  1. Today menu
  2. Vegetable soup with bread
  3. Grilled chicken with potatoes
  4. Fresh fish in the day
  5. Chocolate cake
  6. includes coffee and tea

Both readings are real runs on an iPhone against a page we had printed; the connected one is from 1 September 2026, the phone's own from the run before this language was routed. Nothing here is tidied up.

"bánh mì" read as "bánh mi" — one mark — and the soup came with cake. Every other line survived, which is what makes it dangerous: five right answers and one that is quietly wrong, with nothing on the screen to say which is which.

A warning notice

Printed on it

  1. Nguy hiểm
  2. Không chạm vào dây điện
  3. Giữ trẻ em tránh xa
  4. Gọi quản lý trong trường hợp khẩn cấp

The phone on its own

Read as

  1. Nguy hiềm Không chạm vào dây điện
  2. Giữ trẻ em tránh xa
  3. Goi quản lý trong trường hợp khân cấp

Gave back

  1. The risk of not touching the power cord
  2. Keep children away from
  3. Call management in the case

With a connection

Read as

  1. Nguy hiểm
  2. Không chạm vào dây điện
  3. Giữ trẻ em tránh xa
  4. Gọi quản lý trong trường hợp khẩn cấp

Gave back

  1. Danger
  2. Do not touch the power cord
  3. Keep children away from
  4. Call management in an emergency

Both readings are real runs on an iPhone against a page we had printed; the connected one is from 1 September 2026, the phone's own from the run before this language was routed. Nothing here is tidied up.

Worse on a sign that matters. "Nguy hiểm" read as "Nguy hiềm", and the word Danger is simply not in what came back — the line was swallowed into the one about the cable, and "in an emergency" lost its last word. With a connection all four lines are there.

That measurement is why Vietnamese is read online when it can be. It is a preference rather than a requirement, so nothing stops working in flight mode. What works with no internet.

And with a connection, at its best

A railway station sign

Printed on it

  1. Ga Trung Tâm
  2. Sân ga số 3
  3. Tàu đi sân bay
  4. Mua vé trước khi lên tàu
  5. Lối ra bên phải

What the app gave back

  1. Central station
  2. Station field No. 3
  3. Airport train
  4. Buy tickets before boarding the train
  5. Exit right

Read and translated on an iPhone, 1 September 2026, from a page we had printed — so the original is known rather than guessed. Nothing here is tidied up.

Platform number kept, direction kept, the instruction about buying before boarding intact. The one wobble is "Sân ga số 3" arriving as "Station field No. 3" — clumsy, and you would still find platform 3. How the camera reads.

Questions

Does Vietnamese translation work offline on iPhone?

Typing does, completely, once the Vietnamese pack is downloaded. The camera works offline too, but the phone’s own recogniser drops tone marks, and in Vietnamese a dropped mark is a different word — so when there is a connection the photograph is read with one instead.

What actually goes wrong without a connection?

Marks. On a printed menu the phone read "bánh mì" as "bánh mi" and the translation came back as "vegetable soup with cake" instead of "with bread". On a warning sign it read "Nguy hiểm" as "Nguy hiềm" and the word Danger disappeared from the output entirely. Both are on this page in full.

So is the camera useless on a plane?

No, and that is why it still works without a connection rather than refusing. You get a reading with some marks missing, which is usually enough to know what you are looking at — and if you need it right, take the scan anyway and it is translated again properly when you are back online.

Do I need an account?

No. No sign-up, no email address and no password anywhere in the app. The first 15 translations are free with advertisements.

Take it with you

The first 15 translations are free, with ads and no card. Download the Vietnamese pack before you go and the phone can do the rest on its own.

Get SofiLingo on the App Store

All 58 languages · translating with the camera · translating with no internet · a translator for going abroad