Skip to content

Yatsu Reader Docs

Yatsu Reader is a web-based ebook reader built for Japanese learners, with support for reader customization, language-specific text handling, reading statistics, offline use, account settings sync, and optional integrations with tools such as Jiten Reader, Google Drive, and Yatsu Whispersync.

These docs focus on the parts of Yatsu that usually need extra explanation: how reading behavior works, what sync does and does not cover, how to set up external storage, how statistics are recorded, and how Yatsu stays compatible with related TTU/Ttsu workflows.

Start here

  • Using the Reader: Reader controls, page movement, bookmarks, table of contents, appearance settings, image gallery, reading tracking, and completion behavior.
  • Using the Library: Opening books, select mode, range selection, drag selection, and bulk library actions.
  • Yatsu Accounts and Settings Sync: Signing in, usernames, what Settings Sync includes, what stays local, sync status, per-device overrides, and privacy basics.
  • Using Yatsu Offline: What works offline, how to prepare books, persistent storage, full offline use, cache data, and syncing again after being offline.
  • Frequently Asked Questions: Short answers for common confusing cases.
  • How to Report Bugs: How to download diagnostics, what to include in a report, and what private data is or is not included.
  • Advantages of Yatsu over Ttsu: A practical comparison of Yatsu's reader, library, language, sync, tracking, and integration improvements over upstream Ttsu.

Reading and language support

  • Reading Tracking: What Yatsu records, how time and characters are counted, reading goals, statistics controls, privacy, sync, and export behavior.
  • Chinese Support: Content language settings, Chinese fonts, character counting, recommended setup, and current limitations.
  • Korean Support: Korean fonts, character counting methods, setup recommendations, and current limitations.

Sync, storage, and data

  • WebDAV Storage: Use a NAS, self-hosted server, or other WebDAV endpoint as a Yatsu library and sync source.
  • Google Drive Sync: The one-click Google Drive setup, what Yatsu stores in Drive, and the legacy custom Google Cloud setup.
  • Statistics and Sync: How reading statistics behave across local books, Drive-backed books, synced libraries, and multiple devices.
  • Migrating from Ttsu to Yatsu: How to export a backup zip from ttsu and import it into Yatsu.
  • Recovering Old GitHub Pages Data: How to export and import data from the old GitHub Pages version of Yatsu.
  • Compatibility with Ttsu: How Yatsu treats TTU/Ttsu data compatibility, what should transfer cleanly, and where behavior may still differ.

Integrations

  • Using Yatsu with Jiten Reader: How to connect Jiten Reader to Yatsu and what to try if parsing does not start right away.
  • Yatsu Whispersync: How the Yatsu-compatible userscript syncs playback and subtitles, exports Anki cards, and works with external storage.