A free, open-source translate extension for Chrome

No. OpenImmersive Translator is an independent open-source project with its own team and code. It is a different product from Immersive Translate (沉浸式翻译), and the two share no code or company. Immersive Translate is a trademark of its respective owner; we name it only because many people know bilingual page translation by that product. Our name is sometimes written Open Immersive Translator; both refer to this project at openimmersive.ai.

Yes. OpenImmersive Translator is a free, open-source translate extension for Chrome, also on Firefox and Microsoft Edge. It shows each paragraph of a web page with its translation right underneath, in 199 languages. Its Google, Microsoft and MyMemory engines need no account; with your own DeepL, OpenAI or DeepSeek key you pay that provider directly.

Side-by-side translation, also called parallel text or parallel translation, keeps the original text on the page and puts its translation right under each paragraph, so you can read both and check one against the other. OpenImmersive Translator does this on any web page in Chrome, Firefox and Edge, and you can switch to translation-only when you just want the meaning. Where you can't install an extension, paste the page's link into the bilingual web page translator on this site.

Yes, with the free engines. Side-by-side translation in the OpenImmersive Translator extension costs nothing to install or use: its Google, Microsoft and MyMemory engines need no account. With your own DeepL, OpenAI or DeepSeek key you pay that provider directly, and the optional Standard and Premium AI tiers spend credits from an openimmersive.ai account.

Yes. Side-by-side translation shows each paragraph followed by its translation; switch to translation-only when you just want the meaning. You can also hover over a paragraph to translate only that one, select a phrase for a quick popup, or translate what you type into an input box.

Side-by-side translation works on web pages in Chrome, Firefox and Edge once the extension is on, and the page's own layout stays as it was. Browsers do not let any extension run on their own internal pages, such as the new-tab page. Where you can't install an extension, paste a link into the bilingual web page translator on this site.

Yes. The OpenImmersive Translator extension is licensed under AGPL-3.0 and its code is on GitHub, so you can read it, report issues or build it yourself. It is published on the Chrome Web Store, Firefox Add-ons and Microsoft Edge Add-ons. Only the extension is open source: this website, including its Standard and Premium AI tiers, is a hosted service.

The browser extension is free; this website has a free tier and paid plans. The extension for Chrome, Firefox and Edge costs nothing to install or use: its Google, Microsoft and MyMemory engines are free and need no account, and with your own DeepL, OpenAI or DeepSeek key you pay that provider directly. On this website, Fast translation of up to 5,000 characters per request needs no account, and 3 format-preserving PDF pages a day are free. The optional AI tiers (Standard and Premium), in the extension and on this website, spend credits from an openimmersive.ai account; new accounts start with 100 welcome credits. Paid options are sold through Stripe: Plus ($16 a month, or $8 a month billed yearly) and Max ($34 a month, or $24 a month billed yearly) subscriptions, and one-time credit packs ($10 for 1,000 credits).

No. The extension works without an account or a subscription: its Google, Microsoft and MyMemory engines are free, and with your own DeepL, OpenAI or DeepSeek key you pay that provider directly. On this website, Fast translation and 3 layout-preserving PDF pages a day are free without signing in. An account is only needed for the optional Standard and Premium AI tiers.

Yes. In the extension's settings you can choose DeepL, OpenAI or DeepSeek and paste your own API key. The key stays on your device, and requests go from your browser straight to that provider.

With the free engines or your own key, the extension sends text from your browser straight to the engine you chose — there is no OpenImmersive Translator server in between — and your settings and history stay in your browser. The AI tiers and the tools on this website process your text on our servers to translate it; the Privacy Policy says how long uploaded files and results are kept.

Fast is instant and free — great for quick, everyday text. Standard adds context-aware AI that reads more naturally. Premium is our best top-model quality for nuanced or professional work. You switch per translation, so you only spend credits when you actually want the extra quality.

Word, PowerPoint, Excel, TXT, Markdown and SRT files translate on this website and come back in the same format. PDFs go to the PDF translator at openimmersive.ai/pdf, which keeps the original layout; it handles text-based PDFs (not scans) of up to 200 pages and 50 MB on every plan, and outputs English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Spanish, Portuguese, Turkish, Russian or Ukrainian (academic paper mode: Simplified Chinese only). Log in there with your openimmersive.ai account and the same account pays: 3 free pages a day (shared with the Documents tab), then your plan's bonus pages, then a voucher code if you entered one, then credits: 5 a page on Fast or 10 on Standard.

199 target languages for text, images, speech, web pages, and Office and text documents; layout-preserving PDF translation outputs English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Spanish, Portuguese, Turkish, Russian or Ukrainian. A single request handles up to 5,000 characters on Free, 30,000 on Plus, and 100,000 on Max; image uploads are capped at 10 MB, 50 MB and 100 MB respectively. Office documents are capped at 10 MB on Free and 20 MB on Plus and Max. The PDF translator at openimmersive.ai/pdf takes PDFs up to 50 MB and 200 pages on every plan.

Credits are what the AI tiers spend: Standard runs 1 credit per 5,000 characters and Premium 1 per 400, and Fast text translation never costs credits. Format-preserving PDF pages beyond your free and plan pages cost 5 credits each on Fast or 10 on Standard. One balance works across the website, openimmersive.ai/pdf and the extension. Plus and Max are monthly or yearly subscriptions and the $10 credits pack is a one-time purchase, all paid through Stripe Checkout. Yearly plans start with a 3-day free trial; to cancel a subscription, email [email protected].