CIRCØ is a free, private, browser-based EPUB reader with instant tap-to-translate. Open any EPUB book, read it paginated with light or dark theme, and tap a word — or select a phrase — to translate it without leaving the page. No account, no install, and your library stays on your device.
Open an EPUB in CIRCØ →An EPUB translator is a tool that lets you read EPUB books in a foreign language and translate words or phrases inline without switching apps. CIRCØ is a browser-based EPUB translator that opens any .epub file, displays it in a paginated reader, and gives you instant translations with a single tap — no extension, no app store download, and no account required.
Traditional e-readers like Kindle offer limited built-in dictionaries, and standalone translation apps force you to copy-paste text back and forth. CIRCØ eliminates that friction: your book and your translations live side-by-side in one interface, and every word you look up is automatically saved for later vocabulary review.
Tap-to-translate is CIRCØ's core reading interaction. While reading any EPUB page, simply tap or click a word to see its translation appear in a small popover directly above the word. For longer text, select a phrase or full sentence and the popover shows the translation of the entire selection.
Only the specific word or phrase you tap is sent for translation. The rest of your book stays entirely on your device — CIRCØ never uploads your files. See the privacy policy for full details.
Most e-reader apps — Kindle, Apple Books, Google Play Books — lock you into a single ecosystem and offer limited dictionary lookups rather than full translation. Browser extensions like Google Translate work on web pages but cannot open EPUB files. CIRCØ bridges that gap:
CIRCØ supports nine languages for EPUB translation. You can translate between any pair by choosing the From and To languages in the header:
This covers the most widely studied foreign languages. Whether you're reading a French novel, a Japanese light novel, or a Spanish textbook, CIRCØ handles the translation in one consistent interface.
Yes. CIRCØ is an installable Progressive Web App (PWA). Once you install it from your browser, the reader itself works fully offline — you can open books, navigate pages, adjust settings, and review saved highlights without an internet connection. Translation requires a network connection, but all other reading features function offline.
Yes. CIRCØ is completely free with no account, no subscription, and no hidden limits. You can open and translate as many EPUB books as you want. Your library, reading position, highlights, and vocabulary are stored locally in your browser and never sent to a server.
Read books in the language you're learning and translate only the words you don't know. Because every translated word is saved, CIRCØ doubles as a vocabulary tracker that grows as you read. Revisit your vocabulary list to see every word you've looked up, organized by book and language pair. Everything stays private: your library, highlights, and history never leave your browser, and only the specific text you tap is sent for translation.
CIRCØ is not just an EPUB reader — it also handles PDF translation, comic and manga translation, and video subtitle translation, so you can learn from any medium in one place. Read the full guide to explore every feature.
Start reading with tap-to-translate →Questions? Email circ0@circ0.com. See our privacy policy and terms of use.