DeepL is an AI-powered translation service that delivers high-quality machine translation between dozens of languages, with support for context-aware translation, document translation, glossaries, and rephrasing/improvement via DeepL Write. The DeepL API is offered in Pro and Free tiers and exposes endpoints for text translation, document translation, glossaries, language metadata, usage, and write/rephrase.
DeepL publishes 15 API contracts indexed on the APIs.io network, including Voice API, Admin API, Correct Text API, and 12 more. Tagged areas include Artificial Intelligence, Deep Learning, Glossary, Localization, and Machine Learning.
The DeepL catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.
DeepL’s developer surface includes authentication, developer portal, documentation, pricing, engineering blog, and 18 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Horizontal (data, software, accessibility, platform) regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet,
not penalised by it.
The six quality facets above are damped to 75 points between them,
because the conditional facet above carries the other
25. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 75% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/deepl: open an issue to ask a question, or submit a pull request to add artifacts.
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Markets this provider is in provisional
The Kin Score Market layer reads a provider inside its market:
its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted:
not part of the Kin Score or agent readiness.
Registered MCP server and declares compatibility are report only — not weighted.
Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
The DeepL Voice API provides real-time speech transcription and translation. A POST to /v3/voice/realtime issues an ephemeral token and WebSocket streaming URL; clients then ope...
The `correct` endpoint fixes spelling and grammar errors without broader rephrasing. Use it when you want a minimal-change correction pass rather than the broader rewriting perf...
Please note that this is the spec for the (old) v2 glossary endpoint. We recommend users switch to the newer v3 glossary endpoints, which support editability and multilinguality...
The *glossary* functions allow you to create, inspect, edit and delete glossaries. Glossaries created with the glossary function can be used in translate requests by specifying ...
The *Spoken Terms* functions allow you to create, inspect, edit and delete Spoken Terms collections. Spoken Terms improve speech recognition in the Voice API: they ensure specif...
**Beta.** Retrieve a quality evaluation report for a document DeepL has translated. Reports are requested with `enable_quality_evaluation` on `POST /v2/document` and polled here...
The document translation API allows you to translate whole documents and supports the following file types and extensions: * `docx` - Microsoft Word Document * `pptx` - Microsof...
The translation memory endpoints allow you to manage your account's translation memories, used to store and reuse previously created translations. You can list and retrieve tran...
The Voice API provides real-time voice transcription and translation services. Use a two-step flow: first request a streaming URL via REST, then establish a WebSocket connection...
WebSocket streaming API for real-time voice transcription and translation. After obtaining a streaming URL and token via the REST API (POST /v3/voice/realtime), establish a WebS...
aid: deepl
name: DeepL
url: https://raw.githubusercontent.com/api-evangelist/deepl/refs/heads/main/apis.yml
kind: company
deliveryModel:
model: saas
open_source: false
commercial: true
callable_host: true
label: Hosted service · you call their endpoint
confidence: high
source:
- openapi
- pricing
generated: '2026-08-28'
method: derived
accessModel:
pricing: freemium
onboarding: self-serve
trial: false
try_now: true
public: false
label: Freemium · Self-serve signup
confidence: medium
source:
- plans
- authentication
- security
generated: '2026-09-03'
method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/deepl.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-25
x-docs-hosting: vercel
tags:
- Artificial Intelligence
- Deep Learning
- Glossary
- Localization
- Machine Learning
- Machine Translation
- Translation
- Real-Time
tags_raw:
- Artificial Intelligence
- Deep Learning
- Glossaries
- Localization
- Machine Learning
- Machine Translation
- Translation
- Machine-Learning
- Real-Time
created: '2024-11-07'
modified: '2026-05-30'
specificationVersion: '0.23'
description: DeepL is an AI-powered translation service that delivers high-quality machine translation between dozens of languages,
with support for context-aware translation, document translation, glossaries, and rephrasing/improvement via DeepL Write.
The DeepL API is offered in Pro and Free tiers and exposes endpoints for text translation, document translation, glossaries,
language metadata, usage, and write/rephrase.
apis:
- aid: deepl:deepl-voice-api
name: DeepL Voice API
description: The DeepL Voice API provides real-time speech transcription and translation. A POST to /v3/voice/realtime issues
an ephemeral token and WebSocket streaming URL; clients then open a WSS channel to stream source audio chunks and receive
incremental source-language transcriptions, translated transcriptions, and (closed beta) synthesized translated audio.
There is no documented webhook callback URL on the REST APIs; document translation remains polling-based.
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- Real-Time
- Speech-to-Text
- Streaming
- Transcription
- Translation
- Voice
- WebSocket
properties:
- type: Documentation
url: https://developers.deepl.com/api-reference/voice
- type: Reference
url: https://developers.deepl.com/api-reference/voice/websocket-streaming
- type: OpenAPI
url: openapi/deepl-voice-api-openapi.yml
- type: AsyncAPI
url: asyncapi/deepl-voice-api-asyncapi.yml
- type: AsyncAPI
url: https://developers.deepl.com/api-reference/voice.asyncapi.yaml
- aid: deepl:deepl-adminapi-api
name: DeepL Admin API
description: Endpoints for organization administrators to manage API keys and retrieve usage analytics.
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- Admin API
tags_raw:
- AdminApi
properties:
- type: OpenAPI
url: openapi/deepl-adminapi-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-correcttext-api
name: DeepL Correct Text API
description: 'The `correct` endpoint fixes spelling and grammar errors without broader rephrasing. Use it when you want
a minimal-change correction pass rather than the broader rewriting performed by `rephrase`.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- CorrectText
properties:
- type: OpenAPI
url: openapi/deepl-correcttext-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-manageglossaries-api
name: DeepL Manage Glossaries API
description: 'Please note that this is the spec for the (old) v2 glossary endpoint.
We recommend users switch to the newer v3 glossary endpoints, which support editability and multilinguality.
The *glossary* functions allow you to create, inspect, and delete glossaries.
Glossaries created with the glossary function can be used in translate requests by specifying the
`glossary_id` parameter.
If you encounter issues, please let us know at support@DeepL.com.
Currently you can create glossaries with any of the languages DeepL supports (with the exception of Thai).'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- ManageGlossaries
properties:
- type: OpenAPI
url: openapi/deepl-manageglossaries-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-managemultilingualglossaries-api
name: DeepL Manage Multilingual Glossaries API
description: 'The *glossary* functions allow you to create, inspect, edit and delete glossaries.
Glossaries created with the glossary function can be used in translate requests by specifying the
`glossary_id` parameter. A glossary contains (several) dictionaries.
A dictionary is a mapping of source phrases to target phrases for a single language pair.
If you encounter issues, please let us know at support@DeepL.com.
Currently you can create glossaries with any of the languages DeepL supports (with the exception of Thai).
The maximum size limit for a glossary is 10 MiB = 10485760 bytes and each source/target text,
as well as the name of the glossary, is limited to 1024 UTF-8 bytes.
A total of 1000 glossaries are allowed per account.
When creating a dictionary with target language `EN`, `PT`, or `ZH`, it''s not necessary to specify a variant
(e.g. `EN-US`, `EN-GB`, `PT-PT`, `PT-BR`, or `ZH-HANS`).
Dictionaries with target language `EN` can be used in translations with either English variant.
Similarly `PT`, and `ZH` dictionaries can be used in translations with their corresponding variants.
(When you provide the ID of a glossary to a translation, the appropriate dictionary is automatically applied. Currently
glossaries can not yet be used with source language detection.)
Glossaries created via the DeepL API are now unified with glossaries created via the DeepL website and DeepL apps.
Please only use the v3 glossary API in conjunction with multilingual or edited glossaries from the website.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- ManageMultilingualGlossaries
properties:
- type: OpenAPI
url: openapi/deepl-managemultilingualglossaries-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-managespokenterms-api
name: DeepL Manage Spoken Terms API
description: 'The *Spoken Terms* functions allow you to create, inspect, edit and delete Spoken Terms collections.
Spoken Terms improve speech recognition in the Voice API: they ensure specific words and phrases,
such as company names, acronyms, and product names, are transcribed correctly. A collection contains
one or more term lists, each holding terms for a single language, and is applied to a voice session
via the `spoken_terms_id` parameter.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- ManageSpokenTerms
properties:
- type: OpenAPI
url: openapi/deepl-managespokenterms-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-metainformation-api
name: DeepL Meta Information API
description: Information about API usage and value ranges
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- MetaInformation
properties:
- type: OpenAPI
url: openapi/deepl-metainformation-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-qualityevaluation-api
name: DeepL Quality Evaluation API
description: '**Beta.** Retrieve a quality evaluation report for a document DeepL has translated. Reports are requested
with `enable_quality_evaluation` on `POST /v2/document` and polled here. A report lists per-segment quality issues categorized
by error type and severity, with character spans pointing to where each issue occurs.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- QualityEvaluation
properties:
- type: OpenAPI
url: openapi/deepl-qualityevaluation-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-rephrasetext-api
name: DeepL Rephrase Text API
description: The `rephrase` endpoint is used to make corrections and adjustments to texts based on style or tone.
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- RephraseText
properties:
- type: OpenAPI
url: openapi/deepl-rephrasetext-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-style-rules-api
name: DeepL Style Rules API
description: The Style Rules API from DeepL — 5 operation(s) for style rules.
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- Style Rules
properties:
- type: OpenAPI
url: openapi/deepl-style-rules-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-translatedocuments-api
name: DeepL Translate Documents API
description: "The document translation API allows you to translate whole documents and supports the following file types\
\ and extensions:\n * `docx` - Microsoft Word Document\n * `pptx` - Microsoft PowerPoint Document\n * `xlsx` - Microsoft\
\ Excel Document\n * `xlsm` - Microsoft Excel Macro-Enabled Workbook (currently in beta)\n * `pdf` - Portable Document\
\ Format\n * `htm / html` - HTML Document\n * `txt` - Plain Text Document\n * `xlf / xliff` - XLIFF Document (versions\
\ 1.2, 2.0, and 2.1)\n * `srt` - SRT Document\n * `vtt` - WebVTT Subtitle Document (currently in beta)\n * `idml` -\
\ Adobe InDesign Markup Language\n * `xml` - XML Document\n * `json` - JSON Document\n * `yaml / yml` - YAML Document\
\ (currently in beta)\n * `properties` - Java Properties Document (currently in beta)\n * `strings` - iOS/macOS Strings\
\ Document (currently in beta)\n * `md / markdown` - Markdown Document (currently in beta)\n * `dita` - DITA topic (Darwin\
\ Information Typing Architecture)\n * `mif` - Adobe FrameMaker Interchange Format\n * `zip` - SCORM Package (e-learning\
\ content, currently in beta)\n * `odt` - OpenDocument Text Document (currently in beta)\n * `rtf` - Rich Text Format\
\ Document (currently in beta)\n * `resx` - .NET Resource Document (currently in beta)\n * `jpeg` / `jpg` / `png` -\
\ Image (currently in beta)"
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- TranslateDocuments
properties:
- type: OpenAPI
url: openapi/deepl-translatedocuments-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-translatetext-api
name: DeepL Translate Text API
description: The text-translation API currently consists of a single endpoint, `translate`, which is described below.
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- TranslateText
properties:
- type: OpenAPI
url: openapi/deepl-translatetext-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-translationmemories-api
name: DeepL Translation Memories API
description: 'The translation memory endpoints allow you to manage your account''s translation memories, used to store
and reuse previously created translations. You can list and retrieve translation memories, page through
their stored segments, create one by importing a TMX file, export one back to TMX, and delete one.
Editing the contents of an existing translation memory is not supported; import a new one instead.
Importing and exporting run as background jobs. Create the job, then poll
`GET /v3/translation_memories/jobs/{job_id}` until it reports `completed`.
Translation memories can be used in text translation requests by
specifying the `translation_memory_id` parameter to denote a specific translation memory and the
`translation_memory_threshold` which defines the minimum matching percentage required for a translation memory
segment to be applied (recommended to be 75% or higher). A translation request fails with `404` if the
translation memory does not exist or does not cover the requested language pair.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- TranslationMemories
properties:
- type: OpenAPI
url: openapi/deepl-translationmemories-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-voiceapi-api
name: DeepL Voice API
description: 'The Voice API provides real-time voice transcription and translation services.
Use a two-step flow: first request a streaming URL via REST, then establish a WebSocket connection for streaming audio
and receiving transcriptions.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- Voice API
tags_raw:
- VoiceAPI
properties:
- type: OpenAPI
url: openapi/deepl-voiceapi-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
- aid: deepl:deepl-voicetranslatejob-api
name: DeepL Voice Translate Job API
description: '**Alpha.** Async voice translation jobs. This API may change without notice.'
humanURL: https://developers.deepl.com/api-reference/voice
baseURL: https://api.deepl.com/v3
tags:
- VoiceTranslateJob
properties:
- type: OpenAPI
url: openapi/deepl-voicetranslatejob-api-openapi.yml
- type: Documentation
url: https://developers.deepl.com/docs
- type: Reference
url: https://developers.deepl.com/docs/api-reference
- type: JSONSchema
url: json-schema/deepl-translation.json
- type: JSONSchema
url: json-schema/deepl-glossary.json
- type: Rules
url: rules/deepl-translation-api-rules.yml
common:
- type: Plans
url: plans/deepl-plans-pricing.yml
- type: RateLimits
url: rate-limits/deepl-rate-limits.yml
- type: FinOps
url: finops/deepl-finops.yml
- type: PostmanWorkspace
url: https://www.postman.com/kinlaneapi/deepl/overview
- type: AgenticAccess
url: agentic-access/deepl-agentic-access.yml
- type: TrustCenter
url: security/deepl-trust-center.yml
- type: VulnerabilityDisclosure
url: security/deepl-vulnerability-disclosure.yml
- type: DomainSecurity
url: security/deepl-domain-security.yml
- type: Authentication
url: authentication/deepl-authentication.yml
- type: LinkedIn
url: https://www.linkedin.com/company/deepl
- type: Website
url: https://www.deepl.com/
- type: Portal
url: https://developers.deepl.com/
- type: Documentation
url: https://developers.deepl.com/docs
- type: Authentication
url: https://developers.deepl.com/docs/getting-started/auth
- type: Pricing
url: https://www.deepl.com/pro
- type: SDKs
url: https://github.com/DeepLcom/deepl-python
- type: SDKs
url: https://github.com/DeepLcom/deepl-node
- type: TermsOfService
url: https://www.deepl.com/pro-license
- type: PrivacyPolicy
url: https://www.deepl.com/privacy
- type: JSONLD
url: json-ld/deepl-context.jsonld
- type: Vocabulary
url: vocabulary/deepl-vocabulary.yml
- type: Integrations
url: https://www.deepl.com/en/integrations
- type: LlmsText
url: https://developers.deepl.com/llms.txt
- url: https://www.deepl.com/en/blog/rss.xml
type: Blog
integrations:
- name: DeepL
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
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