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, analytics included. Closing the tab discards it.
This is not only a promise: the site’s Content-Security-Policy limits outgoing requests to this origin and to the analytics hosts described below, and nothing else. An automated test fails the build if anything else leaves the origin during an import, or if any word from the vocabulary appears in an analytics request.
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
This site uses Google Tag Manager and Google Analytics to measure how many people visit and which pages they read. These are third-party scripts from Google, they load on every page, and they set cookies in your browser. Google receives your IP address and standard browser information, and acts as a separate data controller for it.
What they never receive is anything from your Kindle: no word, no sentence, no book title, no device identifier. The vocabulary is parsed in the tab and is not part of any measurement event. A build-time test checks this by importing a database and failing if any of its words turn up in an outgoing analytics request.
If you would rather not be measured, any browser-level content blocker or a Do Not Track extension will stop these scripts, and the importer works exactly the same without them.
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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