Immersive translation that never leaves your browser.
OpenImmersive is a free, open-source browser extension for side-by-side bilingual reading and PDF translation. Your text goes straight from your browser to the translation engine — we run no servers and collect nothing.
Try it right now
Runs in your browser · free engine · no account, nothing stored
How it works
- 1Install the extension
- 2Pick a translation engine (free ones work out of the box)
- 3Press Alt+T — read any page in two languages
Everything you need, nothing you don't
Side-by-side bilingual
Original and translation together, toggle with one key.
Select-to-translate
Highlight any text for an instant translation.
Multiple engines
Free Google / MyMemory / LibreTranslate, or bring your own DeepL / DeepSeek / OpenAI key.
Read more →Layout-preserving PDF
Translate PDFs into real, selectable text while keeping images, tables and formatting.
Read more →Keyboard shortcut
Alt+T to toggle translation instantly.
Local-only storage
API keys stay in your browser, never uploaded.
Your browser, straight to the engine
- No backend servers
- No data collection
- No telemetry
- Keys stored locally
- Open source & auditable
Pick any engine — free or your own key
Free engines work with zero setup. Prefer higher quality? Bring your own key — it never leaves your browser.
| Engine | Free | Needs key | Note |
|---|---|---|---|
| Google Translate | Free | Works out of the box | |
| MyMemory | Free | Free fallback | |
| LibreTranslate | Free | Open-source, self-hostable | |
| DeepL Free API | sign-up | High quality | |
| DeepSeek | pay-as-you-go | Very low-cost AI translation | |
| OpenAI GPT-4o-mini | pay-as-you-go | High-quality AI translation |
How OpenImmersive compares
| OpenImmersive | Typical closed-source alternatives | |
|---|---|---|
| Open source | ||
| Privacy (direct connection, no middle layer) | ||
| Free engines built in | limited | |
| Bring-your-own-key support | limited | |
| Data collection | ||
| Account required |
Built in the open
AGPL-3.0 licensed, no build step, pure JavaScript — read every line, audit it, or contribute.
Frequently asked questions
Is OpenImmersive free?
Yes. The extension is free and open-source (AGPL-3.0). Built-in engines like Google and MyMemory need no payment or key. Premium engines (DeepL/DeepSeek/OpenAI) are optional and use your own account.
Does it collect my data or send my browsing to your servers?
No. OpenImmersive has no backend. Translation requests go directly from your browser to the engine you chose. We collect nothing and run no telemetry.
Do I need an account?
No account, no sign-up. Install and use.
Which translation engines can I use?
Free: Google, MyMemory, LibreTranslate (self-hostable). Bring-your-own-key: DeepL, DeepSeek, OpenAI.
Can it translate PDFs?
Yes. PDFs are translated into real, selectable text while keeping images, tables and layout. Choose bilingual or translation-only output. Scanned image-only PDFs aren't supported yet.