Offline AI Translation Tools

LibreTranslate is a self-hosted machine translation API for developers and organizations that want to run translation on their own servers. It's free to download and can work offline. The project is open source under the GNU Affero General Public License v3.0 (AGPL-3.0).

Aiko is a paid, native transcription app for macOS, iOS and visionOS that processes speech on your device with OpenAI's Whisper model. It's for people turning meetings, lectures or other recordings into text while keeping the audio local, including sensitive recordings.

Linguist is a free browser translation extension for people who read across languages and want control over where their text goes. Its built-in Bergamot translator processes text on your device without an internet connection. You can also choose an external translation provider or connect a local backend such as Ollama or LibreTranslate.

ChatGPTBox is a free, open-source browser extension for people who want AI help with the pages they read, search results and selected text. It works in Chrome, Edge, Firefox and Safari, with mobile support too. You can connect it to Ollama or a self-hosted model through its custom model mode, or use cloud services such as ChatGPT, Claude, Moonshot and Azure.

Raycast Ollama brings Ollama models into Raycast on macOS and Windows, for people who want AI chat and text assistance within their desktop launcher. It connects to Ollama on your own machine or a remote server you choose. The extension is open source under the MIT license, and local inference doesn't require an Ollama API key.

insanely-fast-whisper is a command-line tool for people who want to transcribe audio on their own hardware, with a focus on processing long recordings quickly. It runs OpenAI's Whisper locally on NVIDIA GPUs or Apple Silicon Macs, including support for Windows with CUDA. The project is open source under the Apache 2.0 license.

Bergamot Translator is a C++ library for running neural machine translation on your own device. Developers can integrate it into native applications or build it for WebAssembly. Separate browser integrations, such as the TranslateLocally extension, make the engine accessible to end users. The software is free and open source under the Mozilla Public License 2.0.

Voxtral is Mistral AI's open-source audio and text model for developers building self-hosted speech applications. It can answer questions about recordings and produce structured summaries within the same model that transcribes speech. Mistral's separate mistral-inference library is archived and no longer maintained; Voxtral supports vLLM and Hugging Face Transformers.

NativeMind brings a local AI assistant into Chrome for people who want help with webpages, documents, and writing without sending that content to a cloud model. The browser extension connects to Ollama on your machine, keeping prompts and AI processing on-device. It requires no account and uses the AGPL-3.0 open-source license.

Whishper is a self-hosted speech-to-text app for people who need transcripts or translated subtitles from audio and video. Its browser interface brings transcription, translation and subtitle editing together, with all three running on your own machine. It can work offline, so local media doesn't need to go to a cloud transcription service.

MacWhisper is a native macOS transcription app for people working with interviews, lectures, meetings and other recorded audio. It runs speech recognition on your own Mac, so local transcription keeps audio on your device. It also offers cloud transcription through services such as OpenAI, ElevenLabs and Deepgram, which send audio off your machine.

VideoLingo is a self-hosted video translation app for creators and educators who need bilingual subtitles or dubbed versions of their videos. It brings transcription, translation and subtitle timing into one browser interface, with dubbing as an optional output. The project is open source under Apache 2.0; a separate hosted service offers subtitle translation and dubbing.

Immersive Translate is an AI translation extension and mobile app that keeps original text alongside its translation. It's aimed at students, researchers and people who read foreign-language material for work. The bilingual page layout lets readers compare passages without replacing the source text.

LocalWriter brings local LLM writing assistance into LibreOffice Writer for people who want to draft and revise text inside their documents. It runs on macOS, Windows and Linux and connects to a separate model runner, including Ollama and text-generation-webui. With a backend on your own machine, text processing stays local.

Whisper WebUI turns audio into transcripts and subtitles through a browser interface that runs on your own machine or a self-hosted server. It's for people captioning videos, transcribing recordings or translating spoken content who want local speech processing. The project is open source under Apache 2.0 and supports Docker and Pinokio.

pyVideoTrans translates spoken audio into another language and produces a video with translated subtitles and AI dubbing. It's for people adapting videos for audiences in other languages who want control over which parts run locally. It recognizes speech directly, so the original video doesn't need subtitles.

ThunderAI brings AI writing and email processing into Thunderbird for people who want help with their inbox while choosing where their messages go. It can use local models through Ollama or an OpenAI-compatible server such as LM Studio. Cloud connections send the selected content to ChatGPT, the OpenAI API, Google Gemini or Claude instead.

Superwhisper is an AI dictation app for macOS, Windows, iOS and Android that turns speech into text in the app you're using. It's for people who prefer speaking to typing, including developers dictating requests to coding assistants. Speech recognition can run locally and offline, or use cloud models for remote processing.

CTranslate2 is an open-source C++ and Python library for developers running Transformer models on their own hardware or servers. It handles translation, text generation, text encoding and speech recognition. Its custom runtime focuses on reducing inference time and memory use compared with general-purpose deep learning frameworks.

Argos Translate runs neural machine translation locally, so you can translate text without sending it to an online service. It's for people who need offline translation and developers who want to add it to their own software. The Python library and desktop interface use the same translation engine, and the project is open source under the MIT license.

Buzz transcribes and translates speech on your own computer using OpenAI's Whisper. It's for people who need transcripts or subtitles from recordings, plus live captions from a microphone. Local transcription works offline; the optional OpenAI Whisper API sends audio to a cloud service.

PDFMathTranslate translates scientific PDFs while keeping their page layout, formulas, charts, contents pages and annotations. It's for researchers, students and others who need to read papers in another language without losing the relationship between the text and its figures. It produces both translated PDFs and bilingual documents for comparison with the original.

Nextcloud Assistant brings AI into Nextcloud Hub's documents, email, chat and calendar. It's for teams that want help with shared work while choosing where AI processing happens. With an on-premises model, data stays on your server. The app is open source under AGPL-3.0.

ebook2audiobook turns non-DRM ebooks into narrated audio with chapters and metadata, for readers who want audio editions of their own books. It runs locally on Windows, macOS and Linux, with Docker support and a browser interface built with Gradio. It's open source under Apache 2.0.

Lingarr is a self-hosted subtitle translator for people who maintain a media library and want subtitles in another language. It automates translation of subtitle files using a service you choose, with support for both local AI and hosted translation providers.

Speaches is a self-hosted speech server for developers who want transcription, translation and speech generation on their own hardware. Its OpenAI-compatible API lets applications use local speech models through tools and SDKs built for OpenAI's API. The project is open source under the MIT license.

subgen generates subtitles on your own hardware for personal media libraries, including films and shows that don't have usable subtitles available. It's an open source, MIT-licensed Python service that runs in Docker or as a standalone application. Speech recognition runs locally using Whisper models through faster-whisper and stable-ts, with support for CPU processing and NVIDIA GPUs through CUDA.

Vibe is an open source desktop app for people who need transcripts or subtitles without uploading their recordings to a transcription service. It runs on macOS, Windows and Linux under the MIT license. Audio transcription works fully offline, with processing on your own computer.

Whisper ASR Webservice turns Whisper speech recognition into a self-hosted API for developers adding transcription to their apps or services. It runs in Docker on your own machine or server, with CPU processing or CUDA GPU acceleration. The Python project is open source under the MIT license.

TranslateLocally is an open source machine translation app for Windows, macOS and Linux. It's for people who want to translate text on their own device, including those handling material they don't want to send to a remote translation service. The desktop app has an MIT license and uses Marian and Bergamot translation models.

Speech Note combines offline dictation, reading aloud and translation in a desktop app for Linux and Sailfish OS. It's for people who want to take multilingual notes, type by voice or listen to text without sending their words to a cloud service. Speech and text processing stay on your device; models are downloaded separately through the app's graphical browser.

Subtitle Edit is an MIT-licensed subtitle editor for Windows, macOS and Linux. It's for people creating captions, translating dialogue or fixing subtitles that don't match the video. Its core editing, conversion and video playback work offline on your device, with optional AI tools for transcription and translation.

Google AI Edge Gallery is an open-source app for people who want to try generative AI on their own phone. It runs model inference locally, so offline chat, image analysis and audio tasks don't send your inputs to a server. It supports Android and iOS and uses the Apache 2.0 license.

Interpreter reads Japanese text from game windows and displays English translations over your screen. It's built for people playing Japanese retro games, with MeikiOCR tuned for game text and pixel fonts. The default OCR and Sugoi V4 translation models run locally, so text stays on your computer and no internet connection is needed after setup. It's open source under the MIT license, with support for Windows, macOS and Linux.

OPUS-CAT runs neural machine translation locally on Windows for professional translators who work in computer-assisted translation (CAT) tools. Its offline engine keeps translation processing on the user's computer, so translators can use machine translation for confidential text without sending it to a cloud translation service.