Can LibreTranslate Be Used Completely Offline?

Yes. When self-hosted, LibreTranslate runs entirely offline after the language models are downloaded. No external network calls are made during translation, making it suitable for air-gapped environments or privacy-sensitive deployments.

How Many Languages Does LibreTranslate Support?

LibreTranslate currently supports 30+ languages via Argos Translate models. Language pair availability depends on which Argos Translate packages are installed; most translations route through English as a pivot language.

What Is The Difference Between Self-Hosting And Using The Managed API?

Self-hosting gives unlimited translations with no rate limits, full data privacy, and no cost beyond server infrastructure. The managed API at portal.libretranslate.com removes the need for server maintenance but caps requests at 80–200/minute depending on the plan.

Does LibreTranslate Store Or Log Translated Text?

In self-hosted setups, no data leaves your server. For the managed portal API, their privacy policy states they implement technical and organizational security measures and do not resell data — though users requiring zero-data retention should prefer self-hosting.

Can Custom Language Models Be Trained And Used With LibreTranslate?

Yes. The Locomotive toolkit provided by the LibreTranslate GitHub organization allows training custom Argos Translate models. These can be installed into any LibreTranslate instance, enabling domain-specific or low-resource language translation.

Listed · Reviewed Jun 2026 · 7-criteria rubric

AI Productivity Tools

LibreTranslate

Name: LibreTranslate
Availability: InStock
Author: Argos Open Tech / LibreTranslate

Open Source Machine Translation API — Private, Self-Hosted, Free

by Argos Open Tech / LibreTranslate · Remote / Open Source Project · Founded 2020

Visit LibreTranslate →

Pricing

From $29/mo

What is LibreTranslate?

LibreTranslate is a free, open-source machine translation API built entirely without proprietary dependencies like Google or Azure. Powered by the Argos Translate engine (built on OpenNMT), it supports 30+ languages and can be self-hosted offline or accessed via a managed cloud API.

Developers can integrate it directly into applications using REST API calls, with bindings available for Python, Go, Rust, PHP, .NET, JavaScript, and C++.

It is the go-to choice for privacy-conscious teams, open-source projects, and developers who need full control over their translation infrastructure without vendor lock-in.

LibreTranslate — Open Source Machine Translation API — Private, Self-Hosted, Free Whether you're evaluating LibreTranslate for your team or comparing it to alternatives in the AI Productivity Tools category, this in-depth review covers everything: features, pricing, real user reviews, pros and cons, integrations, and direct comparisons against competitors.

LibreTranslate Demo Video

Key Features 8

Free and Open Source Machine Translation API with no proprietary dependencies

Fully self-hosted, offline-capable deployment for maximum data privacy

Auto language detection with confidence scoring built into the API

Supports HTML and plain text translation without breaking markup structure

Multi-language bindings available for Python, Node.js, Go, Java, PHP, and more

Docker, Kubernetes, and Helm chart support for scalable cloud deployments

GPU acceleration support via CUDA for faster, high-performance translations

Prometheus metrics endpoint for real-time API monitoring and performance tracking

Who Is LibreTranslate For

1 Backend Developers

2 Open-Source Project Maintainers

3 Privacy-Focused Enterprises

4 DevOps Engineers

5 Academic Researchers

Pros & Cons

Pros 4 benefits

Fully Self-Hostable, Zero Vendor Lock-In
Multi-Language SDK Bindings
Active Open Source Community
Offline-Capable Deployment

Cons 3 limitations

Translation Quality Below Commercial APIs
2,000 Character Per-Call Limit
No Free Managed API Key

Frequently Asked Questions

5 questions

Who is LibreTranslate for?

LibreTranslate is most useful for Backend Developers, Open-Source Project Maintainers, Privacy-Focused Enterprises and DevOps Engineers.

LibreTranslate pricing

LibreTranslate uses a freemium model: a usable free tier with optional paid upgrades. Headline pricing: From $29/mo. For the current tier breakdown and any limits, see the pricing section above or check the vendor's pricing page directly — limits and prices change.

What's New

monthly

Health Check And IPv4 Bind Fixes 1.9.6

Fixed health checks and bind address handling in IPv4-only server setups; updated apscheduler dependency.

May 26

MiniSBD Model Prefetch And Version Display Fix 1.9.5

Added prefetching for MiniSBD sentence boundary detection models and resolved version display bug in the UI.

Mar 3

View all updates

User Base

50K+ developers & self-hosters

Active Users

Security & Privacy

Self-Hosted (Any Region) or Managed Cloud

Self-Hosted Option Ensures Zero Third-Party Data Transmission No Translation Logs Retained On Managed API AGPL-3.0 License — Full Source Code Auditability

Collaboration & Teams

Multi-User Access Version History

Learning & Support

Resources

Documentation Video Tutorials

Community

Forum Discord

Support Channels

Email Priority

Localization

UI Languages

30+

Content Languages

Multi-Language UI RTL Support Auto-Translation

Recognition & Trust

Open Source

Media: Featured on Reddit r/opensource, Hacker News, and the Awesome Humane Tech list

All Features of LibreTranslate