By default, yes — everything stays on your device. Type Shifter processes all text locally. This means:
• Your documents are not uploaded to any server by default
• Bionic Reading, formatting, OCR, and text-to-speech all happen entirely on your device
• We never see, read, or store content you haven't chosen to sync
• There is no analytics or tracking
There are two exceptions. The first is cross-device library sync, which is optional and off unless you turn it on. If you enable it, the documents, highlights, and reading position for the items you choose to sync are stored securely on our servers, so they can follow you between your Windows, Android, and web apps. This is capped at 250MB across up to 4 devices per license, and you decide per-document whether to sync just the plain text or a full copy with original formatting.
The second is the optional AI Tools add-on (Summarize, Translate, Simplify, Ask a Question, Flashcards, OCR Cleanup, and Describe Images). Using any of these sends the relevant document text to our AI provider to generate a response, only when you actively choose to use one of these tools. Offline Translate on Windows is different: it runs entirely on your device and never sends text anywhere.
The only data stored on your device regardless of sync is:
• Your trial/premium status (to know if you've purchased)
• Names of your last 5 files (for the Recent Files feature - NOT the content)
• Your preference settings (like Bionic Reading intensity)
This data stays on your device and can be cleared by clearing your browser storage. We don't use analytics, tracking pixels, or any data collection tools beyond what's needed to make sync itself work.