Threads automatically translates posts written in languages you do not speak. When the app cannot detect the exact language of a post, it uses a fallback language based on your account settings. This reference explains how Threads chooses a fallback language and lists the supported fallback languages for each interface language. Understanding this system helps you predict which translations you will see and how to adjust your settings for accurate results.
Threads relies on Instagram profile data, system language, and app language settings to determine your primary language. If you set your app language to English but often engage with posts in Spanish, Threads may use Spanish as your fallback language. The fallback language appears when the automatic language detection confidence is below a certain threshold.
This article covers the complete list of supported fallback languages in Threads, how the app selects them, and how to change your fallback behavior by adjusting your Instagram language settings.
Key Takeaways: Threads Fallback Language Selection
- Profile > Language > App Language: Sets your primary language for the Threads interface and strongly influences the fallback language.
- Instagram account language setting: Threads inherits language preferences from your linked Instagram profile.
- Automatic language detection threshold: When confidence is below 90 percent, the app uses the fallback language instead of a detected language.
How Threads Chooses a Fallback Language
Threads does not have a dedicated fallback language setting. Instead, the app derives the fallback language from three sources in this order of priority:
1. Instagram Account Language
Threads is tied to your Instagram profile. The language you set in Instagram under Profile > Settings > Account > Language becomes the primary language for your Threads experience. If you change your Instagram language, Threads updates within a few minutes.
2. Threads App Language
You can override the Instagram language by setting a separate app language in Threads. Go to Profile > the two-line menu icon > Language > App Language. This selection takes immediate effect and becomes the fallback language for auto-translate.
3. System Language
If you have not set a language in Instagram or Threads, the app falls back to your device operating system language. For Android, this is under Settings > System > Languages & Input. For iOS, go to Settings > General > Language & Region.
When Threads detects a post in a language that does not match your primary or fallback language, it shows a See Translation button. Tapping it translates the post into the fallback language.
Complete List of Supported Fallback Languages in Threads
Threads supports the same languages as Instagram for auto-translate. The fallback language is always one of the languages listed below. The app does not allow you to select a custom fallback language outside this list.
| Language | Locale Code | Available as Fallback |
|---|---|---|
| Arabic | ar | Yes |
| Bulgarian | bg | Yes |
| Catalan | ca | Yes |
| Chinese Simplified | zh-CN | Yes |
| Chinese Traditional | zh-TW | Yes |
| Croatian | hr | Yes |
| Czech | cs | Yes |
| Danish | da | Yes |
| Dutch | nl | Yes |
| English | en | Yes |
| Estonian | et | Yes |
| Filipino | fil | Yes |
| Finnish | fi | Yes |
| French | fr | Yes |
| German | de | Yes |
| Greek | el | Yes |
| Hebrew | he | Yes |
| Hindi | hi | Yes |
| Hungarian | hu | Yes |
| Icelandic | is | Yes |
| Indonesian | id | Yes |
| Italian | it | Yes |
| Japanese | ja | Yes |
| Korean | ko | Yes |
| Latvian | lv | Yes |
| Lithuanian | lt | Yes |
| Malay | ms | Yes |
| Norwegian Bokmal | nb | Yes |
| Polish | pl | Yes |
| Portuguese | pt | Yes |
| Portuguese Brazil | pt-BR | Yes |
| Romanian | ro | Yes |
| Russian | ru | Yes |
| Serbian | sr | Yes |
| Slovak | sk | Yes |
| Slovenian | sl | Yes |
| Spanish | es | Yes |
| Swedish | sv | Yes |
| Thai | th | Yes |
| Turkish | tr | Yes |
| Ukrainian | uk | Yes |
| Vietnamese | vi | Yes |
If your fallback language is not in this list, Threads defaults to English. For example, if you set your app language to Welsh or Swahili, the fallback language becomes English because those languages are not supported for translation.
Steps to Change Your Fallback Language in Threads
- Open your Threads profile
Tap the profile icon in the bottom-right corner of the app. - Access the settings menu
Tap the two-line menu icon in the top-right corner of the profile screen. - Select Language
In the menu, tap Language. You see two options: App Language and Translate Posts. - Set the App Language
Tap App Language and choose a supported language from the list. The fallback language changes to your selection immediately. - Verify the change
Go to the For You feed and find a post in a language different from your new app language. Tap See Translation to confirm the translation appears in your chosen fallback language.
If you want the fallback language to match your Instagram account, set the same language in both places. Changing only the Threads app language overrides the Instagram setting for translation purposes.
Common Misconceptions About Fallback Languages
“I can set a separate fallback language for auto-translate”
Threads does not offer a dedicated fallback language setting. The fallback language is always the same as your app language. If you want translations in a different language, you must change the app language.
“The fallback language translates every post”
Threads only shows the See Translation button when the detected language of a post is different from your app language. If the post is in a language similar to your app language, the button may not appear. For example, if your app language is Spanish and a post is in Portuguese, Threads may treat them as similar and skip the translation prompt.
“Changing Instagram language changes the fallback immediately”
Threads syncs with Instagram language changes, but the update may take up to 15 minutes. Force-close the Threads app and reopen it to speed up the sync.
Threads Fallback Languages vs Instagram Fallback Languages
| Feature | Threads | |
|---|---|---|
| Fallback language source | App language setting | Account language setting |
| Separate fallback setting | No | No |
| Supported languages for translation | 42 languages | 42 languages |
| Sync with Instagram account | Yes, but can be overridden | N/A |
| Default fallback if language unsupported | English | English |
Both apps share the same translation engine and supported language list. The main difference is that Threads allows you to set an app language independent of your Instagram account language, giving you more control over the fallback behavior.
You now understand how Threads selects a fallback language for auto-translate and how to change it. To get translations in a specific language, set that language as your app language in Threads. If you manage multiple accounts, remember that each account can have a different fallback language. For the most consistent experience, keep your Instagram account language and Threads app language the same.