Convert EPUB/PDF and other formats into local HTML pages, then read in Chrome and translate to your language using built-in browser translation.
Most convenient everyday scenario:
Why: no API key setup, no paid translation calls, very fast startup.
EPUB, PDF, TXT, Markdown, FB2, RTF, HTML, MOBI, AZW3.
MOBI and AZW3: requires Calibre installed. DRM-protected files are not supported.
The app works out of the box for EPUB, TXT, FB2, RTF, HTML, Markdown. Install these tools to get full PDF image support and additional formats.
| Tool | Purpose | Needed for | How to install |
|---|---|---|---|
| pdftotext (Xpdf / Poppler) |
High-quality PDF text extraction — handles complex fonts, ligatures, multi-column layout better than the built-in library | PDF files — optional, built-in fallback used when absent | xpdfreader.com → "Xpdf tools" or already included in Git for Windows |
| ffmpeg | Converts JPEG 2000 images (.jpx) extracted from PDFs into JPEG — browsers do not support JPEG 2000 natively | PDF files that contain JPEG2000-encoded images (common in commercial PDFs) | gyan.dev/ffmpeg → "release essentials" or winget install ffmpeg |
| Calibre | Converts MOBI / AZW3 to EPUB before processing | Required for MOBI and AZW3 format support | calibre-ebook.com |
Without pdftotext: built-in Go PDF reader is used (slightly lower quality). Without ffmpeg: JPEG2000 images in PDFs will not be visible in the browser. Without Calibre: MOBI/AZW3 files cannot be opened.
| Flag | Default | Description |
|---|---|---|
| -notranslate | false | Convert only, skip translation |
| -noopen | false | Do not auto-open browser |
| false | Google Cloud Translation API | |
| -ollama | false | Local Ollama translation |
| -split | 5000 | Split pages at N chars, 0 disables split |
| -folder | empty | Custom output parent folder |
| -src | en | Source language |
| -dst | ru | Target language |
| -force | false | Rebuild even if output exists |