DeepL Chrome Extension with Your Own Key

To use DeepL in Chrome without a translation subscription, install OpenImmersive Translator (openimmersive.ai), an open-source DeepL Chrome extension that takes your own API key, and paste your DeepL key in its settings. Each paragraph of the page then gets its DeepL translation underneath, and the requests go from your browser straight to DeepL. You pay DeepL for what you use, and nothing to us.

Why bring your own key

Most bilingual extensions sell a monthly plan that bundles AI translation. If you already have a DeepL or OpenAI account, that means paying twice. With your own key, the DeepL Chrome extension is only the reader: it shows the original and the translation side by side, and the provider bills you directly. DeepL's API Free plan includes 500,000 characters a month, which covers a lot of reading.

How to set up the DeepL Chrome extension

1. Install OpenImmersive Translator from the Chrome Web Store. It is also on Firefox and Microsoft Edge.
2. Open the extension's settings and choose DeepL as the engine. Paste your DeepL API key.
3. Open any page and press Alt+T. The translation appears under each paragraph.

The same settings take an OpenAI or a DeepSeek key instead, if you prefer an AI model to DeepL.

Where your text and your key go

• Your key stays on your device. The extension keeps it in the browser's local storage and sends it only to the provider you chose.
• No server in between. With your own key, the text goes from your browser to DeepL, OpenAI or DeepSeek. Our servers never see it.
• Optional masking. Turn on local masking and emails, phone numbers, card numbers and API keys in the page are replaced with placeholders before anything is sent, then restored in your browser.

No key at all?

You do not need a key to start. The DeepL Chrome extension setup is optional: out of the box, OpenImmersive Translator uses free Google, Microsoft and MyMemory engines with no account. If Google is rate-limited, it moves on to Microsoft, then MyMemory, so the page keeps translating.

What this is not

• It is not DeepL's own extension. DeepL makes an official one; this is an open-source (AGPL-3.0) bilingual reader that can use your DeepL key.
• It does not translate videos as they play.

FAQ

Do I need a subscription to use this DeepL Chrome extension? No. The extension is free. With your own key you pay DeepL, OpenAI or DeepSeek directly.

Is the extension open source? Yes, under AGPL-3.0, with the code on GitHub.

Can I use it without any key? Yes. The free engines need no account.

For a side-by-side look at how it compares with Immersive Translate, see the Immersive Translate alternative comparison.