All documents in Google Translator Toolkit must have a source and target language:
- The source language is the original language of the document, before any translation.
- The target language is the language into which you're translating the document.
Google Translator Toolkit doesn't support translations of single documents written in multiple languages. But you can split files into documents of one language each and submit them individually.
For now, Google Translator Toolkit supports the following source and target languages:
Source languages| Arabic | English | Hungarian | Romanian |
| Belarusian | English (UK) | Italian | Russian |
| Bulgarian | Finnish | Japanese | Spanish |
| Chinese | French | Korean | Swedish |
| Croatian | German | Norwegian | Thai |
| Czech | Greek | Polish | Ukrainian |
| Danish | Hebrew | Portuguese (Brazil) | Yiddish |
| Dutch | Hindi | Portuguese (Portugal) | |
Target languages
| Abkhazian | Farsi | Luba-Katanga | Somali |
| Achinese | Fijian | Luba-Lulua | Soninke |
| Acoli | Filipino | Lunda | South Ndebele |
| Adangme | Finnish | Luo | Southern Altai |
| Adyghe | Fon | Luxembourgish | Southern Sotho |
| Afar | French | Macedonian | Spanish |
| Afrikaans | French (Switzerland) | Madurese | Spanish (Argentina) |
| Ainu (Japan) | Friulian | Magahi | Spanish (Bolivia) |
| Albanian | Fulah | Maithili | Spanish (Chile) |
| Amharic | Ga | Makasar | Spanish (Colombia) |
| Angika | Galician | Malagasy | Spanish (Costa Rica) |
| Arabic | Ganda | Malay | Spanish (Dominican Republic) |
| Aragonese | Gayo | Malayalam | Spanish (Ecuador) |
| Araucanian | Gbaya | Maltese | Spanish (El Salvador) |
| Armenian | Georgian | Manchu | Spanish (Guatemala) |
| Aromanian | German | Mandingo | Spanish (Honduras) |
| Assamese | German (Austria) | Manipuri | Spanish (Latin America) |
| Asturian | German (Switzerland) | Maori | Spanish (Mexico) |
| Avaric | Gilbertese | Marathi | Spanish (Nicaragua) |
| Awadhi | Gondi | Mari | Spanish (Panama) |
| Aymara | Gorontalo | Marshallese | Spanish (Paraguay) |
| Azerbaijani | Greek | Marwari | Spanish (Peru) |
| Balinese | Guarani | Masai | Spanish (Puerto Rico) |
| Baluchi | Gujarati | Mende | Spanish (United States) |
| Bambara | Haitian | Minangkabau | Spanish (Uruguay) |
| Bantu | Hausa | Moksha | Spanish (Venezuela) |
| Basa (Cameroon) | Hawaiian | Mongo | Sranan Tongo |
| Bashkir | Hebrew | Mongolian | Sukuma |
| Basque | Herero | Mossi | Sundanese |
| Beja | Hiligaynon | Nauru | Susu |
| Belarusian | Hindi | Navajo | Swahili |
| Bemba (Zambia) | Hiri Motu | Ndonga | Swati |
| Bengali | Hmong | Neapolitan | Swedish |
| Berber | Hungarian | Nepali | Swiss German |
| Bhojpuri | Iban | Newari | Tagalog |
| Bihari | Icelandic | Nias | Tahitian |
| Bikol | Igbo | Nogai | Tajik |
| Bini | Iloko | North Ndebele | Tamashek |
| Bislama | Indonesian | Northern Sotho | Tamil |
| Blin | Ingush | Norwegian | Tatar |
| Bosnian | Interlingua | Norwegian (Bokmål) | Telugu |
| Braj | Interlingue | Norwegian (Nynorsk) | Tetum |
| Breton | Inuktitut | Nyamwezi | Thai |
| Buginese | Inupiak | Nyanja | Tibetan |
| Bulgarian | Irish | Nyankole | Tigre |
| Buriat | Italian | Nyoro | Tigrinya |
| Burmese | Japanese | Occitan | Timne |
| Catalan | Javanese | Ojibwa | Tiv |
| Cebuano | Kabardian | Oriya | Tok Pisin |
| Chamorro | Kabyle | Oromo | Tonga |
| Chechen | Kachin | Ossetic | Tsonga |
| Cheyenne | Kalaallisut | Pampanga | Tswana |
| Chinese (Traditional - Hong Kong/Macau) | Kalmyk | Pangasinan | Tumbuka |
| Chinese (Simplified) | Kannada | Papiamento | Turkish |
| Chinese (Traditional) | Kanuri | Pashto | Turkmen |
| Choctaw | Karachay-Balkar | Persian | Tuvinian |
| Chuukese | Kara-Kalpak | Polish | Twi |
| Chuvash | Karelian | Portuguese | Udmurt |
| Corsican | Karen | Portuguese (Brazil) | Uighur |
| Cree | Kashmiri | Portuguese (Portugal) | Ukrainian |
| Crimean Turkish | Kashubian | Punjabi | Umbundu |
| Croatian | Kazakh | Quechua | Upper Sorbian |
| Czech | Khasi | Rajasthani | Urdu |
| Danish | Khmer | Rarotongan | Uzbek |
| Dargwa | Kikuyu | Rhaeto-Romance | Vai |
| Dinka | Kimbundu | Romanian | Venda |
| Divehi | Kinyarwanda | Romany | Vietnamese |
| Dogri | Kirghiz | Rundi | Volapük |
| Duala | Komi | Russian | Walamo |
| Dutch | Kongo | Samoan | Walloon |
| Dyula | Konkani | Sango | Waray |
| Dzongkha | Korean | Santali | Welsh |
| English | Kpelle | Sardinian | Western Frisian |
| English (Australia) | Kuanyama | Sasak | Wolof |
| English (Canadian) | Kumyk | Scots | Xhosa |
| English (India) | Kurdish | Scottish Gaelic | Yakut |
| English (Ireland) | Ladino | Serbian | Yao |
| English (Singapore) | Lahnda | Serer | Yiddish |
| English (South Africa) | Lamba | Shan | Yoruba |
| English (UK) | Lao | Shona | Zande |
| Erzya | Latin | Sichuan Yi | Zapotec |
| Esperanto | Latvian | Sicilian | Zaza |
| Estonian | Lezghian | Sidamo | Zhuang |
| Ewe | Limburgish | Sindhi | Zulu |
| Ewondo | Lingala | Sinhala | |
| Fang | Lithuanian | Slovak | |
| Fanti | Lozi | Slovenian | |
| Faroese | Latvian | Sicilian |
User interface (UI) languages
Google Translator Toolkit's user interface is available in the following languages:
| Bulgarian | German | Norwegian | Spanish |
| Catalan | Greek | Polish | Swedish |
| Croatian | Hindi | Portuguese (Brazil) | Thai |
| Czech | Hungarian | Portuguese (Portugal) | Traditional Chinese |
| Danish | Indonesian | Romanian | Turkish |
| Dutch | Italian | Russian | Vietnamese |
| English | Japanese | Serbian | |
| Filipino | Korean | Simplified Chinese | |
| Finnish | Latvian | Slovak | |
| French | Lithuanian | Slovenian |
To use Google Translator Toolkit's user interface in your language, simply set the your browser's content language to your desired language.