Picture this: you’ve just landed in Tokyo, your phone shows no signal, and you need to ask for directions. Most translation apps are useless without the internet — but your iPhone already carries a translator that works completely offline, with no third-party app needed.
Built into every iPhone since iOS 14, Apple’s Translate app has an on-device mode that processes everything locally. Switch it on, download your languages, and you can translate text, speech, and conversations with zero connection — in airplane mode, abroad, or underground. As a bonus, it’s more private: nothing you translate ever leaves your device.
Before you start: make sure the Translate app is installed
The Translate app is one of Apple’s built-in apps, so it can be deleted like any other app. If you removed it, reinstall it first: open the App Store, search for “Translate,” and download Apple’s version. (Wondering which other built-in apps are safe to remove? Here’s our guide to which built-in iPhone apps you can delete.)
Do the language downloads while you’re on Wi-Fi — the packs are large, and you don’t want them eating your mobile data.
Enable the offline translator, step by step
Step 1: Turn on on-device mode
Open Settings, scroll down, and tap Apps, then Translate. (On older iOS versions, Translate appears directly in the main Settings list.)
Switch on On-Device Mode. This is the crucial toggle: it forces the app to translate locally instead of using Apple’s servers. Apple documents these switches on its Translate settings support page, worth bookmarking since menu names sometimes shift after an iOS update.
Step 2: Download the languages you’ll need
Open the Translate app, tap the More (…) button, and choose Download Languages. Tap the download icon beside each language you want offline — and grab both sides of every pair (English and Japanese, not just one).
Prefer a visual walkthrough? This step-by-step video shows exactly where to tap, and Cult of Mac has a written guide to downloading Translate languages with screenshots.
Step 3: Translate with no connection at all
That’s the whole setup. With on-device mode on and languages downloaded, open the Translate app anywhere — airplane mode, no SIM, no Wi-Fi — and use it as normal: type text, tap the microphone and speak, or point the camera at signs and menus.
Tip: if you translate often, you can also change your iPhone’s default translator app so highlighted text opens in the app you prefer.
If it still doesn’t work
If the app keeps asking for the internet, check these:
- Verify On-Device Mode is on — go back to Settings → Apps → Translate and double-check the switch.
- Confirm both languages are downloaded. A cloud icon means the language isn’t stored on the phone yet.
- Re-download a stuck pack over Wi-Fi if a language refuses to work offline.
- Restart the app via the app switcher so the new settings take effect.
Frequently asked questions
Do all languages work offline?
Only the ones you’ve downloaded. Most supported languages offer offline packs, but a few advanced features may still want a connection for certain pairs. Download everything before you travel and test it in airplane mode at home.
Is on-device translation less accurate?
Slightly, at times: cloud models are larger and occasionally handle tricky idioms better. In practice, on-device translation is very close for everyday phrases, directions, and menus — and you gain speed, privacy, and zero data usage. For travel, it’s the better trade-off.
The bottom line
Setup takes about two minutes: reinstall the Translate app if needed, enable On-Device Mode under Settings → Apps → Translate, and download your languages over Wi-Fi. Do it once before your next trip, and you’ll carry a translator that works anywhere — no signal, no third-party apps, no problem.
