Translate Extension: Side by Side | OpenImmersive by OpenImmersive Translator

OpenImmersive Translator is a free, open-source (AGPL-3.0) translation extension for reading web pages in two languages. Each paragraph gets its translation right underneath, so the original and the translation sit side by side, a layout also called parallel translation.

Free, no account
• Free Google, Microsoft and MyMemory engines: no sign-up, no subscription.
• Bring your own DeepL, OpenAI or DeepSeek API key: requests go from your browser straight to that provider, and you pay them directly.
• Optional AI tiers (Standard, Premium) on openimmersive.ai need an account and use credits.

Read the way you like
• Bilingual mode keeps the page layout and puts the translation under each paragraph.
• Translation-only mode when you just want the meaning.
• Hover a paragraph to translate only that one, select a phrase for a quick popup, or translate what you type in text fields.
• 199 target languages, handy for language learners reading Japanese, Spanish, Chinese or Korean sites with the original in view.
• Press Alt+T to turn translation on or off.

Privacy you can check
• With the free engines or your own key, requests go straight to the engine you chose, with no OpenImmersive server in between. The AI tiers are processed on our servers.
• Settings and keys stay in your browser.
• Optional masking (beta) hides emails, phone numbers, card and ID numbers and API keys before text is sent, and restores them in the translation.
• The source code is public on GitHub, so all of this can be checked.

Files
• The extension translates .srt and .ass subtitle files, and .html, .txt and .md files.
• On openimmersive.ai: PDF and EPUB with the layout kept (7 output languages), plus Word, PowerPoint and Excel.

GitHub: https://github.com/OpenImmersive/OpenImmersive-Translator