OpenReader is an open-source, self-host-friendly text-to-speech document reader built with Next.js for EPUB, PDF, TXT, MD, and DOCX with multilingual, synchronized read-along playback.

Previously named OpenReader-WebUI.

Get started in the docs.

• 🧱 Layout-aware PDF parsing with PP-DocLayoutV3 (ONNX) — structured block detection, cross-page stitching, and geometry-based highlighting for precise read-along sync.
• ⏱️ Word-by-word highlighting via ONNX Whisper alignment through the compute worker control plane (NATS JetStream-backed).
• ⚡ Segment-based read-along for EPUB, PDF, TXT, MD, and DOCX — sentence-aware TTS with cached audio segments, background preloading, and resumable playback.
• 🎯 Multi-provider TTS — self-hosted OpenAI-compatible servers (Kokoro-FastAPI, KittenTTS-FastAPI, Orpheus-FastAPI) or cloud APIs (OpenAI, Replicate, DeepInfra).
• 🌐 Multilingual support — choose a document language for language-aware narration and highlighting. Available languages depend on the configured TTS provider and voice.
• 🎧 Audiobook export in m4b/mp3 with resumable chapter processing.
• 🗂️ Flexible backend — embedded SeaweedFS or S3-compatible storage, SQLite or Postgres, server library import, and device sync.
• 🐳 Self-host friendly — Docker (amd64/arm64), built-in auth/session support, and automatic startup migrations.

• Questions and ideas: GitHub Discussions
• Bug reports: GitHub Issues
• Contributions: open a pull request

MIT. See LICENSE.