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Translation APIs

Machine translation services, localization platforms, open models and parallel-text data for multilingual agents.

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DeepL API

Neural text and document translation API with glossaries and formality control. A free plan has a monthly character limit; paid plans are usage-based.

Free tierAPI key

Google Cloud Translation

Google's text, document and batch translation service with basic and advanced editions and custom glossaries. Billed per character, with a monthly free allowance.

Free tierAPI key

Azure AI Translator

Microsoft's REST translation service for text and documents with language detection and transliteration. Has a free tier with a monthly character limit, then pay as you go.

Free tierAPI key

Amazon Translate

AWS neural machine translation for real-time and batch text and documents, with custom terminology. Billed per character, with a limited free tier for new accounts.

Free tierAPI key

LibreTranslate

Open-source translation API built on Argos Translate that you can self-host for free. A hosted service with API keys is also offered for a fee.

Free tierNo auth

Argos Translate

Open-source offline translation library for Python, with a command line tool and downloadable language packages. Runs locally with no API key.

Lingva Translate

Open-source, self-hostable alternative front end for Google Translate with a simple REST and GraphQL API. It depends on Google's service and public instances can be rate limited.

ModernMT

Adaptive neural machine translation API that learns from translation memories. Usage-based pricing.

Lara Translate

Translation API and SDKs from Translated that take context and translation memories into account. Has a free tier and paid plans.

Free tierAPI key

Systran Translation API

Neural machine translation API from Systran with text, file and language detection endpoints. Plans are subscription or usage based.

Crowdin API

REST API for the Crowdin localization platform, covering projects, source files, translations and translation memories. Free for open-source projects; other plans are paid.

Free tierAPI key

Lokalise API

REST API for the Lokalise localization platform, to manage projects, keys, translations and files. Paid plans, with a free trial.

Smartling API

APIs for the Smartling translation management platform, including file, job and machine translation endpoints. Paid, quote-based plans.

Weglot

Website translation service with a translation API and plugins for common site builders. Has a limited free plan; paid plans scale by word count.

Free tierAPI key

NLLB-200 (Meta)

Meta's open No Language Left Behind models for translation between 200 languages. Weights are released under a non-commercial license and run locally or via Hugging Face.

Helsinki-NLP Opus-MT

Hundreds of small open translation models for specific language pairs, trained on OPUS data. Run locally with Transformers or through Hugging Face.

Tatoeba

Community-built collection of example sentences with translations, available as free downloads under open licenses. Useful as parallel-text data for evaluation and training.

AI Manga Translator

AI manga and image translation with a web editor and a credit-based API. Free guest trial with watermark.

Free tierAPI key

Apertium

Open-source, rule-based machine translation platform, strongest for closely related and under-resourced languages. Runs locally, or as a web service through the apertium-apy server.

Bergamot Translator

Open-source client-side neural translation engine that powers Firefox Translations. Compiles to WebAssembly or a native library and runs small models fully offline.

Mozilla Translations Training Pipeline

Mozilla's open pipeline for training the compact translation models used by Firefox Translations, from data cleaning to quantized release models.

CTranslate2

Fast inference engine for Transformer translation models, with CPU and GPU support and quantization. Converts models such as Opus-MT, NLLB, M2M100 and MADLAD-400.

OpenNMT

Open-source toolkit for training and running neural machine translation and other sequence models, with PyTorch and TensorFlow implementations.

Marian NMT

Efficient open-source neural machine translation framework written in C++, used to train the Opus-MT models. Includes a server mode.

M2M100 (Meta)

Meta's multilingual model that translates directly between 100 languages without pivoting through English. Open weights on Hugging Face, run locally with Transformers.

MADLAD-400 (Google)

Open multilingual translation models from Google trained on the MADLAD-400 dataset, covering more than 400 languages. Several sizes are published on Hugging Face.

SeamlessM4T (Meta)

Meta's multimodal model for speech-to-speech, speech-to-text, text-to-speech and text translation across about 100 languages. Weights have a non-commercial license.

mBART-50 (Meta)

Open many-to-many translation model fine-tuned from mBART for 50 languages. Run locally with Transformers.

Tower (Unbabel)

Open multilingual language models from Unbabel and partners, tuned for translation-related tasks such as post-editing and named-entity handling. Check each model card for its license.

Aya 101 (Cohere Labs)

Open instruction-following model covering 101 languages that can be prompted for translation. Run locally or through Hugging Face.

TranslateGemma (Google)

Open translation models built on Gemma 3 in 4B, 12B and 27B sizes, evaluated on 55 languages. They can also translate text found in images. Released under the Gemma terms.

Hunyuan-MT (Tencent)

Open translation-focused models from Tencent's Hunyuan team. Weights are on Hugging Face; check the model card for languages and license.

IndicTrans2

Open translation models from AI4Bharat for all 22 scheduled Indian languages and English, with evaluation benchmarks. Run locally or via Hugging Face.

Sarvam Translate API

REST translation API for English and Indian languages. Mayura covers 11 languages with formal and colloquial modes; Sarvam-Translate covers the 22 scheduled languages. Usage-based pricing.

Lesan AI

Machine translation API for Ethiopian languages, with English, Amharic and Tigrinya in the documented API. Published price is per character, with speech recognition also offered.

Masakhane

Grassroots research community building open datasets and models for machine translation of African languages. Resources are published on GitHub and Hugging Face.

Tilde Machine Translation

Machine translation from a Latvian language-technology company, with custom engines for European and smaller languages. Commercial, quote-based plans.

Yandex Cloud Translate

Yandex Cloud's neural translation API for text, with language detection and glossaries. Billed per character.

Naver Papago Translation

Papago neural machine translation offered through NAVER Cloud Platform, strong for Korean, Japanese and Chinese. Billed per character.

Baidu Translate API

Baidu's text translation API with many language pairs, documented mainly in Chinese. Requires an account with app ID and key; standard use has a free monthly quota.

Free tierAPI key

Youdao Translation API

NetEase Youdao's text, document and image translation services, documented mainly in Chinese. Requires a registered application.

Tencent Cloud Machine Translation

Tencent Cloud's text, image and speech translation services, accessed with Tencent Cloud API credentials. Billed by usage.

Free tierAPI key

Alibaba Cloud Qwen-MT

Translation-tuned Qwen models in Alibaba Cloud Model Studio, called through an OpenAI-compatible API with term and domain controls. Billed per token.

Doctranslate

Document, image, audio and video translation that keeps the original layout, with an API for integrations. Has a free tier; paid plans add volume.

Free tierAPI key

Gengo

Human translation marketplace with a REST API for ordering, tracking and fetching translations. Priced per word.

Unbabel

Machine translation with automated quality estimation and optional human post-editing, available by API. Quote-based plans.

Phrase API

APIs for the Phrase localization suite, covering string management, translation memory, jobs and machine translation. Paid plans.

Transifex API

REST API for the Transifex localization platform to manage projects, resources, translations and glossaries. Paid plans.

POEditor API

REST API for the POEditor localization platform, to manage terms, translations and exports. Has a free plan with limits; larger projects are paid.

Free tierAPI key

Tolgee

Open-source localization platform with in-context editing, machine translation and a REST API. Self-host for free or use the hosted cloud service.

Free tierAPI key

Lingo.dev

Open-source CLI and compiler that use LLMs to translate app strings and i18n files, with a hosted engine and API. Has a free tier.

Free tierAPI key

Weblate

Open-source web-based continuous localization platform with a REST API and machine translation integrations. Self-host free, or use paid hosting.

Free tierAPI key

Localazy

Localization platform with a REST API and CLI, and a free plan for small and open-source projects. Paid plans scale by usage.

Free tierAPI key

Intento

API layer that routes translation requests to many machine translation engines and recommends the best one per language pair and domain. Commercial plans.

Lingvanex

Machine translation API and self-hosted on-premise option covering over 100 languages. Commercial plans.

RWS Language Weaver

Enterprise machine translation from RWS with adaptable engines and a cloud API. Quote-based pricing.

OPUS

Large open collection of parallel texts in many languages, with a public API for searching and downloading corpora. Widely used to train translation models.

MyMemory

Free translation memory and API from Translated, returning matches contributed by humans and machine translation. Anonymous use has a daily limit.

Free tierNo auth

deep-translator

Python library with one interface to many translation services, including some unofficial free endpoints. Paid providers need their own keys.

DeepL MCP Server

DeepL's official MCP server exposing text and document translation, rephrasing and glossary lookups. Needs a DeepL API key.

Free tierAPI key

Lara MCP Server

Official MCP server for Lara Translate, hosted with OAuth or self-hosted with access keys. Supports context, translation memories and glossaries.

Co-op Translator

Microsoft open-source tool that translates Markdown, notebooks and images in repositories, with a CLI, Python API and MCP server. Needs an Azure OpenAI or OpenAI key.

Microsoft Translator Text API

Discover Azure Translator in Foundry Tools (formerly AI Translator) for text and document translation that extends the reach of apps into 100+ languages.

See siteSee docs

IBM Watson Language Translator

IBM watsonx Orchestrate brings AI agents together to automate work across apps and workflows, with centralized governance that scales across the enterprise.

See siteSee docs

OpenNMT-py

Open Source Neural Machine Translation and (Large) Language Models in PyTorch

OpenNMT-tf

Neural machine translation and sequence learning using TensorFlow

Fairseq

Facebook AI Research Sequence-to-Sequence Toolkit written in Python.

Hugging Face Transformers (translation models)

🤗 Transformers: the model-definition framework for state-of-the-art machine learning models in text, vision, audio, and multimodal models, for both inference and training.

Tencent Machine Translation

腾讯机器翻译（TMT）基于亿级数据积累和领先算法，实现从源语言到目标语言的自动翻译，广泛应用于各类跨语言交流场景。

See siteSee docs

Systran Pure Neural Machine Translation

Translate text, documents and much more in 55+ languages with SYSTRAN fully secured professional translation solutions. API & CAT Tool integration

See siteSee docs

Weblate API

The API is accessible on the/api/ URL and it is based on Django REST framework. You can use it directly or by Weblate Client.

See siteSee docs

Apertium (open‑source rule‑based MT)

Core tools (driver script, transfer, tagger, formatters) for the FOSS RBMT system Apertium

Moses Statistical Machine Translation

Moses, the machine translation system.

LocalizeJS

Localize offers a no-code translation solution, transforming web apps, websites, and documents with AI-driven localization for a smooth global user experience.

See siteSee docs

GitLocalize

GitLocalize is a powerful continuous localization platform for projects on GitHub

See siteSee docs

LibreTranslate (open source)

Free and Open Source Machine Translation API. Self-hosted, offline capable and easy to setup.

Bergamot (Mozilla)

INACTIVE - Bergamot translator.

DeepL Write (enhanced translation)

DeepL Write is a tool that helps you perfect your writing. Write clearly, precisely, with ease, and without errors. Try for free now!

See siteSee docs

Alibaba Cloud Machine Translation

Alibaba Cloud Machine Translation relies on the advantages of leading natural language processing technology and massive e-commerce data to develop a deep neural network translation system.

See siteSee docs

Microsoft Azure AI Language (Translation)

Discover Azure Translator in Foundry Tools (formerly AI Translator) for text and document translation that extends the reach of apps into 100+ languages.

See siteSee docs

OpenNMT (open source)

Open Source Neural Machine Translation in Torch (deprecated)

Marian NMT (open source)

Fast Neural Machine Translation in C++.

TextShuttle (AI translation startup)

Supertext delivers high-quality translations, creative copywriting and superb localisations. Perfectly tailored to your projects. Learn more now!

See siteSee docs

OpenAI GPT-4 Turbo (Translation)

Learn how to use the OpenAI API to generate text from a prompt. Learn about message types and available text formats like JSON and Structured Outputs.

See siteSee docs

Phrase AI Translation Agent

Available for Team, Professional, Business, Enterprise and Software UI/UX plans Get in touch with Sales for licensing questions. ...

See siteSee docs