Privacy
What Book2Deck does with your vocabulary, what it stores, and what never leaves your browser.
Book2Deck is a static website. There is no account, no login and no server that receives your reading data.
Your vocabulary never leaves your browser
The database read from your Kindle — every word, every sentence, every book title — is parsed inside the browser tab and stays there. It is not uploaded, not proxied and not sent to any third party. Closing the tab discards it.
This is not only a promise: the site’s Content-Security-Policy restricts it to its own origin, so the page cannot send data anywhere even if a future mistake tried to. An automated test fails the build if any request leaves the origin during an import.
What is stored on your device
One thing, in your browser’s local storage: a record of which words you have already exported, so a later export can hide them. It holds fingerprints of exported words, not the words themselves, and it never leaves your machine.
You can erase it at any time with Clear local data in the importer. If your browser refuses to store anything — private mode, or storage disabled — the importer says so and keeps working without it.
Your Kindle is only ever read
The USB connection is opened read-only. No file on the device is written, modified or deleted, and Vocabulary Builder is left exactly as it was.
Analytics
At the time of writing there are no analytics, no cookies and no third-party scripts on this site. If that changes, it will be a cookieless, aggregate-only measurement, this page will say so before it goes live, and it will never receive anything from your vocabulary.
Hosting
The site is served as static files by Vercel, which processes standard server logs (IP address, user agent, requested URL) as any web host does. Those logs are about page requests; they cannot contain your vocabulary, because your vocabulary is never requested from the server.
The diagnostic report
If an import fails, you can generate a diagnostic report to share with us. It contains device identifiers, the detected schema, table names, counts and error codes — and deliberately no words, no contexts, no book titles and no serial number. Nothing is sent automatically: the report is shown to you, and sharing it is your decision.
Contact
Questions about this page, or a data request: privacy@book2deck.com.
Trademarks
Book2Deck is an independent project. It is not affiliated with, endorsed by or sponsored by Amazon or Anki. Kindle is a trademark of Amazon.com, Inc. Anki is a trademark of Ankitects Pty Ltd.
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