Privacy Policy

The Doc-HTML-Translate browser extension processes documents (PDF, EPUB, MOBI, AZW3, FB2, RTF, TXT, Markdown, and local HTML) entirely on your device. It does not collect, store, or transmit your documents or any personal data to us or to any third party. It has no servers, no telemetry, no analytics, no ads, and no accounts, and it loads no remote code.

What the extension does

When you open a supported document, the extension opens it in a local viewer bundled with the extension. The viewer reads the file's bytes in your browser and re-renders its text as HTML so your browser's built-in "Translate page" feature can work on it. All extraction and rendering happen locally, using bundled code (PDF.js for PDF; a self-contained unzip + HTML pipeline for EPUB; marked for Markdown; foliate-js for MOBI/AZW3; and small readers for FB2/RTF/TXT/HTML). No code is downloaded or executed from a remote server.

Image text recognition (OCR)

The extension can recognize text baked into images - both images inside your PDFs/EPUBs and any image you right-click with "OCR & translate this image" - so your browser's "Translate page" can translate it. Recognition runs entirely on your device using a bundled engine (Tesseract). English recognition data ships inside the extension and needs no network. Additional recognition languages are optional: only when you explicitly click "Download" are their data files fetched - as data, not code - from a public open-source data host (tessdata_fast on tessdata.projectnaptha.com) and cached locally on your device for reuse. We operate no server; your images and their recognized text are never sent to us or to any third party.

Data we collect

None. We have no servers and receive no data from the extension.

Data stored on your device

The extension uses the browser's local extension storage only to remember your settings: whether reflow is enabled (globally and per-site), your reading preferences (font size, font family, theme), and which optional OCR languages you have downloaded. This data never leaves your device and is removed if you uninstall the extension.

Diagnostics you copy yourself

The options page carries a Copy diagnostics button. Pressing it writes a short English summary to your clipboard: the extension version, your browser and platform, the interface language, your current settings, and the format, page count and last error of the most recent document. It records no document text, no file name and no URL, and your per-site exceptions are reported as a count rather than as host names. The button adds no permission and sends nothing anywhere - it writes to the clipboard only, and you decide whether to paste it into a mail to the author.

Network access

The extension itself makes no network requests to any server we control. It fetches the document you opened (from the site or local file you chose) in order to render it, and it fetches an image you ask it to OCR. The only outbound request beyond that is optional: when you explicitly download an extra OCR language, its data file is fetched from the public open-source host named above and cached locally. Translation is performed by your browser's own built-in translation feature, which you invoke yourself; that feature is governed by your browser vendor's privacy policy, not ours.

Permissions

• declarativeNetRequest and host access - used solely to redirect document opens to the local viewer, to fetch the opened file for local rendering, and to fetch an image you choose to OCR. No browsing data is read or transmitted.
• contextMenus - used solely to add the right-click "OCR & translate this image" action on images.
• storage - used solely to save the settings described above (including which OCR languages you have downloaded).

Children's privacy

The extension is a document-reading utility and does not knowingly collect any data from anyone, including children.

Changes

If this policy changes, the updated version will be published at the same URL with a new "last updated" date.