| Language Tag | Language | Region | Description |
|---|---|---|---|
| ar-SA | Arabic | Saudi Arabia | Arabic (Saudi Arabia) |
| bn-BD | Bangla | Bangladesh | Bangla (Bangladesh) |
| bn-IN | Bangla | India | Bangla (India) |
| cs-CZ | Czech | Czech Republic | Czech (Czech Republic) |
| da-DK | Danish | Denmark | Danish (Denmark) |
| de-AT | German | Austria | Austrian German |
| de-CH | German | Switzerland | "Swiss" German |
| de-DE | German | Germany | Standard German (as spoken in Germany) |
| el-GR | Greek | Greece | Modern Greek |
| en-AU | English | Australia | Australian English |
| en-CA | English | Canada | Canadian English |
| en-GB | English | United Kingdom | British English |
| en-IE | English | Ireland | Irish English |
| en-IN | English | India | Indian English |
| en-NZ | English | New Zealand | New Zealand English |
| en-US | English | United States | US English |
| en-ZA | English | South Africa | English (South Africa) |
| es-AR | Spanish | Argentina | Argentine Spanish |
| es-CL | Spanish | Chile | Chilean Spanish |
| es-CO | Spanish | Colombia | Colombian Spanish |
| es-ES | Spanish | Spain | Castilian Spanish (as spoken in Central-Northern Spain) |
| es-MX | Spanish | Mexico | Mexican Spanish |
| es-US | Spanish | United States | American Spanish |
| fi-FI | Finnish | Finland | Finnish (Finland) |
| fr-BE | French | Belgium | Belgian French |
| fr-CA | French | Canada | Canadian French |
| fr-CH | French | Switzerland | "Swiss" French |
| fr-FR | French | France | Standard French (especially in France) |
| he-IL | Hebrew | Israel | Hebrew (Israel) |
| hi-IN | Hindi | India | Hindi (India) |
| hu-HU | Hungarian | Hungary | Hungarian (Hungary) |
| id-ID | Indonesian | Indonesia | Indonesian (Indonesia) |
| it-CH | Italian | Switzerland | "Swiss" Italian |
| it-IT | Italian | Italy | Standard Italian (as spoken in Italy) |
| ja-JP | Japanese | Japan | Japanese (Japan) |
| ko-KR | Korean | Republic of Korea | Korean (Republic of Korea) |
| nl-BE | Dutch | Belgium | Belgian Dutch |
| nl-NL | Dutch | The Netherlands | Standard Dutch (as spoken in The Netherlands) |
| no-NO | Norwegian | Norway | Norwegian (Norway) |
| pl-PL | Polish | Poland | Polish (Poland) |
| pt-BR | Portuguese | Brazil | Brazilian Portuguese |
| pt-PT | Portuguese | Portugal | European Portuguese (as written and spoken in Portugal) |
| ro-RO | Romanian | Romania | Romanian (Romania) |
| ru-RU | Russian | Russian Federation | Russian (Russian Federation) |
| sk-SK | Slovak | Slovakia | Slovak (Slovakia) |
| sv-SE | Swedish | Sweden | Swedish (Sweden) |
| ta-IN | Tamil | India | Indian Tamil |
| ta-LK | Tamil | Sri Lanka | Sri Lankan Tamil |
| th-TH | Thai | Thailand | Thai (Thailand) |
| tr-TR | Turkish | Turkey | Turkish (Turkey) |
| zh-CN | Chinese | China | Mainland China, simplified characters |
| zh-HK | Chinese | Hong Kong | Hong Kong, traditional characters |
| zh-TW | Chinese | Taiwan | Taiwan, traditional characters |
Last active
June 4, 2025 05:23
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BCP 47 language tags
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This is odd: the EPUB3 specification says to use BCP 47 language codes. Two-letter indexes are given as examples (here, here, here and here). However, here you give four-letter designations, calling them
BCP 47 language tags.What is the reason for the discrepancy?