Supported languages

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Supported languages for indexing features
Supported languages for machine learning models
Supported languages for JavaScript Search Framework
Troubleshooting language indexing issues

The Coveo Platform can index content in most languages. Coveo Machine Learning (Coveo ML) models and Coveo JavaScript Search Framework user interfaces also support a wide array of languages.

Language support and relevance disclaimer

The Coveo Platform supports a wide range of languages across indexing, machine learning models, and user interfaces; however, the depth of linguistic processing varies by language. Support for a language doesn’t constitute a commitment to equivalent relevance, accuracy, or feature parity.

For example, queries and indexed content in languages such as English, French, German, and Spanish generally achieve higher and more consistent relevance due to more comprehensive language analysis and optimized platform components. Conversely, for other languages that are technically supported but for which the platform is not fully optimized, search relevance, generated answers, and overall accuracy may be reduced or less consistent. Accordingly, language support doesn’t guarantee equal relevance quality, and observed outcomes may vary depending on the language.

Supported languages for indexing features

The table below lists the 58 languages Coveo supports where encoding, excerpt, language detection, and thesaurus features are available for indexing. Coveo can also index content in languages other than those listed below as long as:

The language uses spaces to separate words.
The item encodes characters in Unicode.

For languages meeting these requirements, most language features are supported except language detection, decompounding, and stemming.

Note

Since result ranking is partly based on summarization and key-concept extraction techniques, English, French, German, and Spanish queries return the most relevant results consistently.

Language Locale Encoding, excerpt, and thesaurus Did you mean Language detection Stemming Decompounding

English^[2]

en

N/A

French^[2]

fr

N/A

German^[2]

de

Spanish^[2]

es

N/A

Danish

da

Dutch

nl

Finnish

fi

Hungarian

hu

N/A

Italian

it

N/A

Norwegian

no

Portuguese

pt

N/A

Swedish

sv

Turkish

tr

N/A

Catalan

ca

N/A

Romanian

ro

N/A

Valencian

ca

N/A

Armenian

hy

N/A

Russian

ru

N/A

Chinese (traditional and simplified)^[1],[3]

zh

N/A

Greek

el

N/A

Hindi

hi

N/A

Japanese^[1],[3]

ja

N/A

Korean^[1],[3]

ko

N/A

Thai

th

N/A

Arabic

ar

N/A

Basque

eu

N/A

Lithuanian

lt

N/A

Czech

cs

N/A

Indonesian

id

N/A

Polish

pl

N/A

Albanian

sq

N/A

Afrikaans

af

N/A

Belarusian

be

N/A

Bulgarian

bg

N/A

Burmese

my

N/A

Croatian

hr

N/A

Esperanto

eo

N/A

Estonian

et

N/A

Filipino

fil

N/A

Hebrew

he

N/A

Icelandic

is

N/A

Kazakh

kk

N/A

Latvian

lv

N/A

Macedonian

mk

N/A

Malay

ms

N/A

Moldovan

ro

N/A

Mongolian

mn

N/A

Norwegian Bokmål^[4]

nb

Persian

fa

N/A

Serbian

sr

N/A

Slovak

sk

N/A

Slovenian

sl

N/A

Swahili

sw

N/A

Tagalog

tl

N/A

Ukrainian

uk

N/A

Uzbek

uz

N/A

Vietnamese

vi

N/A

Yiddish

yi

N/A

1. Wildcards in queries are not supported.

2. The index can also generate item summaries.

3. A specialized tokenizer based on dictionaries is used to split CJK characters into words, which can impact search results relevancy.

4. Will be detected as Norwegian (no).

Supported languages for machine learning models

The following table outlines the languages supported by the Coveo Machine Learning (Coveo ML) models.

Notes

ART, QS, PQS, DNE, CR, and IAPR models can support content in languages other than those listed in the following table as long as the language uses spaces to separate words. For languages that meet this requirement, most language features are supported.

Available ML models:

Automatic Relevance Tuning (ART)
Case Classification (CC)
Content Recommendations (CR)

Note

Content Recommendations (CR) models are language agnostic, meaning that they can provide recommendations regardless of the language used in their metadata.
Passage Retrieval (CPR)
Dynamic Navigation Experience (DNE)
Intent-Aware Product Ranking (IAPR)
Predictive Query Suggestions (PQS)
Product Recommendations (PR)

Note

Product Recommendations (PR) models are language agnostic, meaning that they can recommend products regardless of the language used in their metadata.
Query Suggestions (QS)
Relevance Generative Answering (RGA)
Semantic Encoder (SE)
Smart Snippets

Language Locale ART, QS, PQS, DNE, and IAPR Smart Snippets, CC, RGA, SE, and CPR

Language	Locale	Smart Snippets, CC, RGA, SE, and CPR
English	`en`
French	`fr`	(Beta) ^[1]
German	`de`	(Beta) ^[1]
Spanish	`es`	(Beta) ^[1]
Danish	`da`	(Beta) ^[1]
Dutch	`nl`	(Beta) ^[1]
Finnish	`fi`	(Beta) ^[1]
Hungarian	`hu`	(Beta) ^[1]
Italian	`it`	(Beta) ^[1]
Norwegian	`no`	(Beta) ^[1]
Portuguese	`pt`	(Beta) ^[1]
Swedish	`sv`	(Beta) ^[1]
Turkish	`tr`	(Beta) ^[1]
Catalan	`ca`	(Beta) ^[1]
Romanian	`ro`	(Beta) ^[1]
Valencian	`ca`	(Beta) ^[1]
Armenian	`hy`	(Beta) ^[1]
Russian	`ru`	(Beta) ^[1]
Chinese (traditional and simplified)	`zh`	(Beta) ^[1]
Greek	`el`	(Beta) ^[1]
Hindi	`hi`	(Beta) ^[1]
Japanese	`ja`	(Beta) ^[1]
Korean	`ko`	(Beta) ^[1]
Thai	`th`	(Beta) ^[1]
Arabic	`ar`	(Beta) ^[1]
Basque	`eu`	(Beta) ^[1]
Lithuanian	`lt`	(Beta) ^[1]
Czech	`cs`	(Beta) ^[1]
Indonesian	`id`	(Beta) ^[1]
Polish	`pl`	(Beta) ^[1]
Albanian	`sq`	(Beta) ^[1]
Afrikaans	`af`	(Beta) ^[1]
Belarusian	`be`	(Beta) ^[1]
Bulgarian	`bg`	(Beta) ^[1]
Burmese	`my`	(Beta) ^[1]
Croatian	`hr`	(Beta) ^[1]
Esperanto	`eo`	(Beta) ^[1]
Estonian	`et`	(Beta) ^[1]
Filipino	`fil`	(Beta) ^[1]
Hebrew	`he`	(Beta) ^[1]
Icelandic	`is`	(Beta) ^[1]
Kazakh	`kk`	(Beta) ^[1]
Latvian	`lv`	(Beta) ^[1]
Macedonian	`mk`	(Beta) ^[1]
Malay	`ms`	(Beta) ^[1]
Moldovan	`ro`	(Beta) ^[1]
Mongolian	`mn`	(Beta) ^[1]
Norwegian Bokmål	`nb`	(Beta) ^[1]
Persian	`fa`	(Beta) ^[1]
Serbian	`sr`	(Beta) ^[1]
Slovak	`sk`	(Beta) ^[1]
Slovenian	`sl`	(Beta) ^[1]
Swahili	`sw`	(Beta) ^[1]
Tagalog	`tl`	(Beta) ^[1]
Ukrainian	`uk`	(Beta) ^[1]
Uzbek	`uz`	(Beta) ^[1]
Vietnamese	`vi`	(Beta) ^[1]

English

en

French

fr

(Beta) ^[1]

German

de

(Beta) ^[1]

Spanish

es

(Beta) ^[1]

Danish

da

(Beta) ^[1]

Dutch

nl

(Beta) ^[1]

Finnish

fi

(Beta) ^[1]

Hungarian

hu

(Beta) ^[1]

Italian

it

(Beta) ^[1]

Norwegian

no

(Beta) ^[1]

Portuguese

pt

(Beta) ^[1]

Swedish

sv

(Beta) ^[1]

Turkish

tr

(Beta) ^[1]

Catalan

ca

(Beta) ^[1]

Romanian

ro

(Beta) ^[1]

Valencian

ca

(Beta) ^[1]

Armenian

hy

(Beta) ^[1]

Russian

ru

(Beta) ^[1]

Chinese (traditional and simplified)

zh

(Beta) ^[1]

Greek

el

(Beta) ^[1]

Hindi

hi

(Beta) ^[1]

Japanese

ja

(Beta) ^[1]

Korean

ko

(Beta) ^[1]

Thai

th

(Beta) ^[1]

Arabic

ar

(Beta) ^[1]

Basque

eu

(Beta) ^[1]

Lithuanian

lt

(Beta) ^[1]

Czech

cs

(Beta) ^[1]

Indonesian

id

(Beta) ^[1]

Polish

pl

(Beta) ^[1]

Albanian

sq

(Beta) ^[1]

Afrikaans

af

(Beta) ^[1]

Belarusian

be

(Beta) ^[1]

Bulgarian

bg

(Beta) ^[1]

Burmese

my

(Beta) ^[1]

Croatian

hr

(Beta) ^[1]

Esperanto

eo

(Beta) ^[1]

Estonian

et

(Beta) ^[1]

Filipino

fil

(Beta) ^[1]

Hebrew

he

(Beta) ^[1]

Icelandic

is

(Beta) ^[1]

Kazakh

kk

(Beta) ^[1]

Latvian

lv

(Beta) ^[1]

Macedonian

mk

(Beta) ^[1]

Malay

ms

(Beta) ^[1]

Moldovan

ro

(Beta) ^[1]

Mongolian

mn

(Beta) ^[1]

Norwegian Bokmål

nb

(Beta) ^[1]

Persian

fa

(Beta) ^[1]

Serbian

sr

(Beta) ^[1]

Slovak

sk

(Beta) ^[1]

Slovenian

sl

(Beta) ^[1]

Swahili

sw

(Beta) ^[1]

Tagalog

tl

(Beta) ^[1]

Ukrainian

uk

(Beta) ^[1]

Uzbek

uz

(Beta) ^[1]

Vietnamese

vi

(Beta) ^[1]

1. Offered as an open beta only for Smart Snippets, RGA, SE, and CPR. To support languages other than English, configure your model for multilingual content retrieval.

Supported languages for JavaScript Search Framework

This table presents the languages supported by the JavaScript Search Framework for building user interfaces with Coveo.

Language Locale Search UI support

Language	Locale	Search UI support
English	`en`
French	`fr`
German	`de`
Spanish	`es`
Danish	`da`
Dutch	`nl`
Finnish	`fi`
Hungarian	`hu`
Italian	`it`
Norwegian	`no`
Portuguese	`pt`
Swedish	`sv`
Turkish	`tr`
Catalan	`ca`
Romanian	`ro`
Valencian	`ca`
Armenian	`hy`
Russian	`ru`
Chinese (traditional and simplified)	`zh`
Greek	`el`
Hindi	`hi`
Japanese	`ja`
Korean	`ko`
Thai	`th`
Arabic	`ar`
Basque	`eu`
Lithuanian	`lt`
Czech	`cs`
Indonesian	`id`
Polish	`pl`
Albanian	`sq`
Afrikaans	`af`
Belarusian	`be`
Bulgarian	`bg`
Burmese	`my`
Croatian	`hr`
Esperanto	`eo`
Estonian	`et`
Filipino	`fil`
Hebrew	`he`
Icelandic	`is`
Kazakh	`kk`
Latvian	`lv`
Macedonian	`mk`
Malay	`ms`
Moldovan	`ro`
Mongolian	`mn`
Norwegian Bokmål	`nb`
Persian	`fa`
Serbian	`sr`
Slovak	`sk`
Slovenian	`sl`
Swahili	`sw`
Tagalog	`tl`
Ukrainian	`uk`
Uzbek	`uz`
Vietnamese	`vi`

English

en

French

fr

German

de

Spanish

es

Danish

da

Dutch

nl

Finnish

fi

Hungarian

hu

Italian

it

Norwegian

no

Portuguese

pt

Swedish

sv

Turkish

tr

Catalan

ca

Romanian

ro

Valencian

ca

Armenian

hy

Russian

ru

Chinese (traditional and simplified)

zh

Greek

el

Hindi

hi

Japanese

ja

Korean

ko

Thai

th

Arabic

ar

Basque

eu

Lithuanian

lt

Czech

cs

Indonesian

id

Polish

pl

Albanian

sq

Afrikaans

af

Belarusian

be

Bulgarian

bg

Burmese

my

Croatian

hr

Esperanto

eo

Estonian

et

Filipino

fil

Hebrew

he

Icelandic

is

Kazakh

kk

Latvian

lv

Macedonian

mk

Malay

ms

Moldovan

ro

Mongolian

mn

Norwegian Bokmål

nb

Persian

fa

Serbian

sr

Slovak

sk

Slovenian

sl

Swahili

sw

Tagalog

tl

Ukrainian

uk

Uzbek

uz

Vietnamese

vi

Troubleshooting language indexing issues

Note

Context and symptoms

You see inconsistent results when searching in a specific language on your website.

Cause

Most languages are limited to the Snowball stemming algorithms. Some rules are incomplete, meaning variations of words aren’t always stemmed correctly.

For example, when searching in German, the words passieren, passierend, and passiert might result in different stems, while passieren and passiere share the same stem.
The correct language isn’t being detected. Stemming is only applied if the language is detected for both the query and the indexed documents.

Resolution

Force the query-time language for the index by specifying the locale query parameter using an appropriate locale tag. For example, setting the locale parameter to de-DE forces the index to prioritize documents in German (as spoken in Germany) when returning results. For the index to take the locale into account, you must also set the forwardLanguageToCoveoIndex query parameter to true.
For Coveo ML CPR, RGA, SE and smart snippets models, see Multilingual content retrieval to configure your model to support multiple languages.