LibreTranslate

Free and open-source machine translation REST API supporting 30+ languages with self-hostable deployment and no third-party service dependency. Powered by the open-source Argos Translate library, LibreTranslate provides endpoints for text translation, language detection, file translation, and translation suggestions. Deployable on-premise for full offline capability or accessible via the managed hosted service.

LibreTranslate publishes 2 API contracts indexed on the APIs.io network: Misc API and Translate API. Tagged areas include Translation, Machine Translation, Natural Language Processing, Open Source, and Self-Hosted.

The LibreTranslate catalog on APIs.io includes 1 Spectral governance ruleset.

LibreTranslate’s developer surface includes documentation, engineering blog, pricing, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.3/100 emerging ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent Heartbeat 88/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 published contract

Translation Machine Translation Natural Language Processing Open Source Self-Hosted

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 24.3/100 · emerging

Contract Quality 7.6 / 19

Developer Ergonomics 1.8 / 15

Access Clarity 2.2 / 15

Operational Transparency 1.9 / 10

Contract Governance 2.1 / 9

Discoverability 4.3 / 8

Regulatory Posture 0.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 11.9 — up to +17.6 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Contract Quality scores 40.7 — up to +14.8 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/libre-translate/apis.yml: open an issue on github.com/api-evangelist/libre-translate to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

LibreTranslate Misc API

The misc API from LibreTranslate — 3 operation(s) for misc.

LibreTranslate Translate API

The translate API from LibreTranslate — 4 operation(s) for translate.

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

LibreTranslate misc API

OPEN COLLECTION

LibreTranslate misc translate API

OPEN COLLECTION

LibreTranslate API pricing

Not yet checked against LibreTranslate's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Self-Hosted (Free)	Free
Pro (Managed)	$29.0
Business (Managed)	$58.0
Custom (Enterprise)	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

LibreTranslate — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

DetectRequest

2 properties

JSON SCHEMA

Language

3 properties

JSON SCHEMA

TranslateRequest

6 properties

JSON SCHEMA

TranslateResponse

3 properties

JSON SCHEMA

Examples 5

Example request and response payloads for these APIs.

Detect Language

4 fields

EXAMPLE

List Languages

4 fields

EXAMPLE

Translate Auto Detect

4 fields

EXAMPLE

Translate Batch

4 fields

EXAMPLE

Translate Text

4 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

LibreTranslate Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

LibreTranslate Agentic Access

7 operations · 4 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

PublicAPIsListing

PublicAPIsListing

Source (apis.yml)

aid: libre-translate
name: LibreTranslate
description: Free and open-source machine translation REST API supporting 30+ languages with self-hostable deployment and
  no third-party service dependency. Powered by the open-source Argos Translate library, LibreTranslate provides endpoints
  for text translation, language detection, file translation, and translation suggestions. Deployable on-premise for full
  offline capability or accessible via the managed hosted service.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/libre-translate.png
url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-08-08'
specificationVersion: '0.23'
tags:
- Translation
- Machine Translation
- Natural Language Processing
- Open Source
- Self-Hosted
tags_raw:
- Translation
- Machine Translation
- Natural Language Processing
- Open Source
- Self-Hosted
- Open-Source
apis:
- aid: libre-translate:libre-translate-misc-api
  name: LibreTranslate Misc API
  description: The misc API from LibreTranslate — 3 operation(s) for misc.
  humanURL: https://libretranslate.com
  tags: []
  tags_raw:
  - misc
  properties:
  - type: OpenAPI
    url: openapi/libre-translate-misc-api-openapi.yml
  - type: Documentation
    url: https://docs.libretranslate.com
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/translate-request.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/translate-response.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/detect-request.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/language.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-ld/jsonld.json
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/finops/finops.yml
- aid: libre-translate:libre-translate-translate-api
  name: LibreTranslate Translate API
  description: The translate API from LibreTranslate — 4 operation(s) for translate.
  humanURL: https://libretranslate.com
  tags:
  - Translate
  tags_raw:
  - translate
  properties:
  - type: OpenAPI
    url: openapi/libre-translate-translate-api-openapi.yml
  - type: Documentation
    url: https://docs.libretranslate.com
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/translate-request.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/translate-response.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/detect-request.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-schema/language.json
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/vocabulary/vocabulary.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/json-ld/jsonld.json
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/finops/finops.yml
common:
- type: AgenticAccess
  url: agentic-access/libre-translate-agentic-access.yml
- type: DomainSecurity
  url: security/libre-translate-domain-security.yml
- type: Website
  url: https://libretranslate.com
- type: Documentation
  url: https://docs.libretranslate.com
- type: GitHubOrg
  url: https://github.com/LibreTranslate
- type: LinkedIn
  url: https://www.linkedin.com/company/libretranslate
- type: Blog
  url: https://community.libretranslate.com
- type: Pricing
  url: https://portal.libretranslate.com
- type: StatusPage
  url: https://status.libretranslate.com
- type: X
  url: https://x.com/libretranslate
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/plans/plans.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/rate-limits/rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/libre-translate/refs/heads/main/finops/finops.yml
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-merged-from:
- libretranslate

LibreTranslate API — frequently asked questions

Does LibreTranslate have an API?

Yes. APIs.io lists 2 APIs from LibreTranslate, including LibreTranslate Misc API and LibreTranslate Translate API.

Is there an OpenAPI specification for the LibreTranslate API?

Yes. APIs.io indexes 2 OpenAPI specifications for LibreTranslate, each linked for download from this page.

How much does the LibreTranslate API cost?

APIs.io lists 4 pricing plans for LibreTranslate, with each plan's price, limits and inclusions under Pricing on this page.

Is the LibreTranslate API ready for AI agents?

LibreTranslate has a Kin Score of 24.3 out of 100 (emerging) and an Agent Readiness score of 23.8 (agent-aware), scored by API Evangelist on 2026-11-13.

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