LibreTranslate

Overview

LibreTranslate is an open-source machine-translation API built on the Argos Translate library, with hosted plans for people who would rather not run it themselves. It suits developers and privacy-conscious users who want a self-hostable service, but its hosted request-length and burst limits matter for heavier workloads.

Key features

Text translation is the core, with automatic source-language detection, separate language detection, alternative translations, and support for HTML or other markup. When a direct language pair is unavailable, the service can pivot through another language, usually English; that broadens its reach, though it is not a direct route for every pair.

The API also has a file-translation endpoint, making it useful beyond short text requests. Hosted requests longer than 2,000 characters should be split into smaller chunks, a practical constraint for long passages or bulk processing. Translation memory and glossary support are absent, so teams that rely on preferred terminology or reuse of prior translations may need another tool.

LibreTranslate can be run locally or on a server at no cost, and is described as capable of offline use. Installation options include Python and Docker; deployment documentation also covers Gunicorn, Kubernetes, and Helm. That flexibility is a meaningful advantage for users who want to control deployment, but it comes with the responsibility of running the service themselves. The software is licensed under GNU Affero General Public License v3.

The hosted service says translation text is not stored or logged; payment information is stored by Stripe. Integrations include a Discourse translator plugin, Android and iOS apps, Firefox extensions, and the minbrowser web browser.

Pricing

The free plan is best suited to self-hosters: LibreTranslate can be run on a machine or server without a charge. The hosted portal has paid plans, but no free trial, and offers a 7 days money-back guarantee.

• Pro — $29 a month: Unlimited translations and bursts of up to 80 translations per minute. It fits moderate hosted workloads, but the burst ceiling may be restrictive for applications with concentrated traffic.
• Business — $58 a month: Unlimited translations and bursts of up to 200 translations per minute. The higher burst limit suits busier services; it costs twice as much as Pro while retaining the same unlimited-translation framing.

Both paid plans remain subject to the guidance to split requests longer than 2,000 characters. For higher request-per-minute or character limits, users can contact support about API keys. No seat limits are given for these plans.

Platforms

LibreTranslate is available through the web and API, and its broader platform footprint includes Android, iOS, browser extensions, Linux, macOS, Windows, and self-hosting. That mix serves both developers integrating translation and users accessing it through compatible apps; the core product is an API rather than a desktop translation suite.

Who it's for

Choose LibreTranslate if you want an open-source translation API, local or server deployment, or a hosted option with unlimited translations and defined burst tiers. It is less suitable when you need translation memory, glossary controls, or a hosted workflow that accepts long requests without chunking.

Pros and cons

• Pro: Free self-hosting and offline-capable local operation give technically equipped users control over where the service runs.
• Pro: Text, markup, language detection, alternative translations, and file translation cover several API use cases.
• Pro: Hosted plans offer unlimited translations, with Business raising the burst allowance to 200 per minute.
• Con: Hosted requests over 2,000 characters need to be split, adding work for long text and batch pipelines.
• Con: No translation memory or glossary support makes consistent terminology harder to manage.
• Con: There is no free hosted trial, so hosted users must rely on the 7 days money-back guarantee when assessing fit.

Alternatives

For a broader directory of choices, see AI Translation Tools and Translation Software.

• Papago is another freemium option, with a free plan and free trial across mobile, web, desktop, extension, and API platforms; choose it if that combination better matches your access needs.
• iTranslate has a free text-translation plan and a PRO plan that adds a keyboard extension; it may fit users prioritizing that keyboard workflow.
• Lara Translate offers a free plan with 60,000 characters per month, one user, and documents up to 10 MB; it is a fit for modest document needs without a credit card.
• Yandex Translate is free for personal, noncommercial text and web-page translation; choose it if you need that use case rather than an API with paid burst tiers.
• Google Cloud Translation offers a 500,000-character monthly free allowance for Neural Machine Translation and a paid text plan; it is worth considering when a character-based allowance better fits your usage.
• Baidu Translate has a freemium offering and broad platform support, including self-hosting; consider it if that platform range better suits your setup.
• PROMT offers paid Lite plans for one language pair or multilingual offline translation; choose it if a defined language-pair plan or offline translation is the priority.
• DeepL Translator has a free version with 50,000 characters per user per month, one file translation monthly, and one glossary; it may suit users who want a stated character allowance and some glossary support.

Verdict

LibreTranslate is a strong fit for developers and privacy-conscious users who value open-source software, self-hosting, and API access. Its clearest advantage is deployment control, with paid hosted tiers for users who need more burst capacity; look elsewhere if terminology management or long, unchunked hosted requests are central to your workflow.