- Minimum system requirements
- Platform support is provided by Electron as defined in Electron github repo Readme Each Electron release provides binaries for macOS, Windows, and Linux. macOS (Big Sur and up): Electron provides 64-bit Intel and Apple Silicon / ARM binaries for macOS. Windows (Windows 10 and up): Electron provides ia32 (x86), x64 (amd64), and arm64 binaries for Windows. Windows on ARM support was added in Electron 5.0.8. Support for Windows 7, 8 and 8.
- Functions
- library functions Icon Function Description Notes Shortcuts Add book Next book Previous book Close (the book information panel) Open book menu (gives access to the Book File, allows to Delete and Export a book) Search Book list view Book grid view Indicates that the action is finished, for example when importing a book Save a copy of the book file. Opens a system window to select the folder where to save the file.
- Keyboard shortcuts
- Information The Shift key is represented by an empty arrow pointing up on some keyboards: ⇧. The Ctrl key is replaced by Cmd key on Mac keyboards. Ctrl + F10: Main content(`FocusMain`) in reader and library windows, moves the keyboard focus to the "main" area landmark (in the reader view, this is immediately before the frame that displays publication content) Ctrl + t: Toolbar (`FocusToolbar`) in reader and library windows, moves the keyboard focus to the top horizontal toolbar, immediately before the "
- Supported publication formats
- EPUB (Electronic PUBlication) is an open file format for electronic publications. EPUB is a native semantic format allowing to use numerous standardised languages such as HTML, ARIA, MATHML, SVG and others. The actual version 3 is known to provide the best up to date reading experience. Obsolete EPUB2 files are also readable in Thorium. DAISY Usually produced and distributed by specialized libraries or NGOs, the DAISY format offers a significantly enhanced reading experience for ebooks that are not available in EPUB3.
- Glossary
- Book information panel (Book Details) Gives information about the digital book. This information is extracted from the file's metadata, its quality and quantity depends on the the attention paid during the production of the file by the publisher. Adapted books These are digital books produced by associations and made available to people with disabilities for reading. Worldwild, this system is governed by The Marrakech Treaty . OPDS Open Publication Distribution System
- Frequently asked questions
- Why can't I open an ebook without it being save in the Thorium Reader library? Thorium, like several other ebook readers and reading systems stores imported publications in its own filesystem space, as this provides a guarantee that per-publication state and external metadata (e.g. bookmarks, settings, annotations, DRM status, etc.) can be reliably attached. If you need to open files without using advanced reading features, and want to keep a manual maintenance of ebook files, you can consider using an alternative.
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Ressources
- 1: Minimum system requirements
- 2: Functions
- 3: Keyboard shortcuts
- 4: Supported publication formats
- 5: Glossary
- 6: Frequently asked questions
1 - Minimum system requirements
Platform support is provided by Electron as defined in Electron github repo Readme
Each Electron release provides binaries for macOS, Windows, and Linux.
- macOS (Big Sur and up): Electron provides 64-bit Intel and Apple Silicon / ARM binaries for macOS.
- Windows (Windows 10 and up): Electron provides ia32 (x86), x64 (amd64), and arm64 binaries for Windows. Windows on ARM support was added in Electron 5.0.8. Support for Windows 7, 8 and 8.1 was removed in Electron 23, in line with Chromium’s Windows deprecation policy.
- Linux: The prebuilt binaries of Electron are built on Ubuntu 20.04. They have also been verified to work on:
- Ubuntu 18.04 and newer
- Fedora 32 and newer
- Debian 10 and newer
Thorium 3.0 has memories issues under Linux, as documented in Issue 2519
2 - Functions
library functions
| Icon | Function | Description | Notes | Shortcuts |
|---|---|---|---|---|
  | Add book | |||
 | Next book | |||
 | Previous book | |||
 | Close (the book information panel) | |||
 | Open book menu (gives access to the Book File, allows to Delete and Export a book) | |||
 | Search | |||
 | Book list view | |||
 | Book grid view | |||
 | Indicates that the action is finished, for example when importing a book | |||
 | Save a copy of the book file. | Opens a system window to select the folder where to save the file. The bookmarks are not present in this exported file. | ||
 | Bookmarks | |||
 | Icon Indicates that the book is being added to Thorium. This indication is not currently given to screen reader users. |
Reading functions
| Icon | Function | Description | Notes | Shortcuts |
|---|---|---|---|---|
 | Return to library (closes the book being read) | |||
  | Open book information panel | Ctrl + i | ||
 | Go to the library | |||
| Search in the publication | Ctrl + f | ||
 | Reading settings | Ctrl + s | ||
| Next content | |||
| Previous content | |||
   | Adds or removes a bookmark | Ctrl + b | ||
 | Opens or closes the navigation panel | Gives access to the table of contents, bookmarks, bookmarks and reference pagination | Ctrl + n | |
 | Full screen | Ctrl + F11 |
Reading settings
User settings & preferences panel for the display of the publication content. Ctrl + s
| Icon | Function | Description | Notes | Shortcuts |
|---|---|---|---|---|
| Text: Change the font size | |||
 | View / Layout : Scroll (text scrolls up and down) | |||
 | Display / Layout : Paginated | |||
 | Automatic Alignment | |||
 | 1 column | |||
 | 2 columns |
Navigation
| Icon | Function | Description | Notes | Shortcuts |
|---|---|---|---|---|
  | Edit (the name of a Bookmark | |||
| no icon (text mention) | Table of contents | Shift + Ctrl + n | ||
| no icon (text mention) | Reference pages menu | Shift + Ctrl + p |
Audio playback (Pré recorded orTTS synthetic voice)
| Icon | Function | Description | Notes | Shortcuts |
|---|---|---|---|---|
 | Activate audio functions | |||
 | Pauses audio playback | Ctrl + 2 | ||
 | Starts audio playback | Ctrl + 2 | ||
 | Goes to the next audio portion (depending on the book production) | Ctrl + 3 | ||
 | Goes to the previous audio portion (depending on the book production) | Ctrl + 1 | ||
 | Stops audio playback | Ctrl + 4 |
3 - Keyboard shortcuts
Information
The Shift key is represented by an empty arrow pointing up on some keyboards: ⇧.
The Ctrl key is replaced by Cmd key on Mac keyboards.
- Ctrl + F10: Main content(`FocusMain`)
- in reader and library windows, moves the keyboard focus to the "main" area landmark (in the reader view, this is immediately before the frame that displays publication content)
- Ctrl + t: Toolbar (`FocusToolbar`)
- in reader and library windows, moves the keyboard focus to the top horizontal toolbar, immediately before the "skip" link (which itself moves focus to the "main" area landmark)
- Ctrl + n: Navigation (`FocusReaderNavigation`)
- in reader window, moves the keyboard focus to the navigation panel (table of contents, bookmarks, etc.)
- Shift + Ctrl + n: Table Of Content (`FocusReaderNavigationTOC`)
- in reader window, moves the keyboard focus to the navigation panel, but more specifically into the table of contents, and if possible at the detected heading / closest to the reading location.
- Shift + Ctrl + p: Go to page (`FocusReaderGotoPage`)
- in reader window, moves the keyboard focus to the "goto page" section in the navigation panel
- Ctrl + s: Reader settings (`FocusReaderSettings`)
- in reader window, moves the keyboard focus to the settings panel (user preferences for displaying publication content)
- Ctrl + b: Bookmarks (`ToggleBookmark`)
- in reader window, toggle bookmark (a notification is produced so that screen readers announce the change)
- Ctrl + F11: Fullscreen (`ToggleReaderFullscreen`)
- in reader window, toggle fullscreen
- Ctrl + i: Book information panel (`OpenReaderInfo`)
- in reader window, publication info popup modal dialog (may be used in future Thorium version for similar feature in library window)
- Shift + Ctrl + i: where am I (`OpenReaderInfoWhereAmI`)
- in reader window, publication info popup modal dialog with direct keyboard focus on section that displays the headings hierarchy trail and other contextual information for the current reading location, such as nearest preceding page break, as well as document index in the reading order (this is the "where am I" feature).
- Shift + Ctrl + k: where am I (quick notification supported by Screen readers) (`SpeakReaderInfoWhereAmI`)
- in reader window, this is the "where am I" feature, just as above, but only spoken via screen reader TTS thanks to an ARIA live region with assertive speech which interrupts the current narration.
- Ctrl + w: Close the book (`CloseReader`)
- in reader window, closes the window and returns to the library view.
- Ctrl + f: Search a book (`FocusSearch`)
- in library window, moves the keyboard focus to the search text input of local bookshelf or OPDS feed
- Ctrl + f: search into a book (`FocusSearch`)
- in reader window, moves the keyboard focus to the publication-wide search text input
- Shift (optional) + F3: previous or next search result (`SearchPrevious` / `SearchNext`)
- in reader window, when the publication-wide search text input is open, finds the previous / next match
- Shift (optional) + Ctrl + G: previous or next search result (`SearchPreviousAlt` / `SearchNextAlt`)
- same as above (alternative keyboard shortcut)
- Ctrl + ← or →: Next OPDS page (`NavigatePreviousOPDSPage` / `NavigateNextOPDSPage`)
- in library window for OPDS feeds, activates the previous or next pagination links
- Ctrl + comma or period: Next OPDS page (`NavigatePreviousOPDSPageAlt / NavigateNextOPDSPageAlt`)
- same as above (alternative keyboard shortcut)
- Ctrl + Shift + ALT (except on MacOS) + ← or →: Previous or next chapter (`NavigatePreviousChapter` / `NavigateNextChapter`)
- in reader window, move to previous or next "chapter" (spine item in the reading order of the publication). Note that the keyboard focus is automatically moved to the "main" area landmark, which is immediately before the frame that displays publication content (just like when following / activating a link in the table of contents).
- Ctrl + page down or page up: Previous or next chapter (`NavigatePreviousChapterAlt` / `NavigateNextChapterAlt`)
- same as above (alternative keyboard shortcut)
- ← or →: Previous or next page (`NavigatePreviousPage` / `NavigateNextPage`)
- in reader window, move to previous or next "page" (or scroll unit, if pagination is disabled)
- Ctrl + comma or period: Previous or next page (`NavigatePreviousPageAlt` / `NavigateNextPageAlt`)
- same as above (alternative keyboard shortcut)
- Ctrl + Home or End: Beginning or End of the publication (`NavigateToBegin` / `NavigateToEnd`)
- in reader window, goes to the beginning or the end of the publication
- Ctrl + backspace with shift modifier for the inverse operation: Previous History & Next History(`NavigatePreviousHistory` / `NavigateNextHistory`):
- in reader window, go back or forward in the navigation history: Beginning or End of the publication
- Ctrl + 1: Previous audio (`AudioPrevious`)
- in reader window, calls the "previous" command for audio (TTS or EPUB3 Media Overlays readaloud, or "rewind" for audiobooks)
- Ctrl + 2: Play or pause audio (`AudioPlayPause`)
- in reader window, calls the "play" or "pause" toggle commands for audio (TTS or EPUB3 Media Overlays readaloud)
- Ctrl + 3: Next audio (`AudioNext`)
- in reader window, calls the "next" command for audio (TTS or EPUB3 Media Overlays readaloud, or "forward" for audiobooks)
- Ctrl + 4: Stop audio (`AudioStop`)
- in reader window, calls the "stop" command for audio (TTS or EPUB3 Media Overlays readaloud, or "pause" for audiobooks)
4 - Supported publication formats
- EPUB
- (Electronic PUBlication) is an open file format for electronic publications. EPUB is a native semantic format allowing to use numerous standardised languages such as HTML, ARIA, MATHML, SVG and others. The actual version 3 is known to provide the best up to date reading experience. Obsolete EPUB2 files are also readable in Thorium.
- DAISY
- Usually produced and distributed by specialized libraries or NGOs, the DAISY format offers a significantly enhanced reading experience for ebooks that are not available in EPUB3. Thorium supports reading DAISY 3 and 2.02, both in their text only, audio only, and syncronised text and audio.
- despite a well-known lack of flexibility (no reflow option) and accessibility, many ebooks are still available in PDF only, especially in public libraries.
- Audiobooks
- a standardized format for audiobooks has been designed by the W3C Publishing Working Group in 2020, and EDRLab was part of this WG. Thorium is supporting the packaged (LPF) audiobook format, which will soon be widely used by booksellers, or so we hope.
- Visual narratives
- EDRLab has designed a standard format for comics, manga, webtoons and other styles of digital works based on sequances of images. Divina is the name of this format. This is still an experimental format, and we hope that publishers will size it in 2021+.
5 - Glossary
- Book information panel (Book Details)
- Gives information about the digital book. This information is extracted from the file's metadata, its quality and quantity depends on the the attention paid during the production of the file by the publisher.
- Adapted books
- These are digital books produced by associations and made available to people with disabilities for reading. Worldwild, this system is governed by The Marrakech Treaty .
- OPDS
- Open Publication Distribution System
6 - Frequently asked questions
- Why can't I open an ebook without it being save in the Thorium Reader library?
Thorium, like several other ebook readers and reading systems stores imported publications in its own filesystem space, as this provides a guarantee that per-publication state and external metadata (e.g. bookmarks, settings, annotations, DRM status, etc.) can be reliably attached.
If you need to open files without using advanced reading features, and want to keep a manual maintenance of ebook files, you can consider using an alternative. A possibility is the Readium2 “test app”, a basic reader-only app (i.e. no library / bookshelf) which provides rudimentary support for ebook features (bookmarks, highlights), with a crude user interface designed for testing the SDK. You may give it a try using the automated builds from Readium2 “test app”GitHub’s releases page
Adding a "one shot reading" feature is not on our road map. Neither is the maintenance of a public stable web reader.
- Why is there no read aloud nor annotations for PDFs?
- EDRLab considers that EPUB 3 is a far better ebook format than PDF, and therefore prioritises its work on offering a great experience to EPUB users. In Thorium Reader, advanced features like TTS and annotations are consequently available for EPUB first, and we expect that other app developers will get the best from PDF files. It does not mean that advanced features will never be available on PDF in Thorium, simply that our limited budget is used for what we consider best for ebook readers.
- I can't select the adequate voice for read aloud function (TTS)
- Thorium uses the voices from the computer's operating system, in combination with the language information provided by the book.
- If you are using windows you can follow Microsoft’s guide Download the language pack for voice.
- If you are using Mac OSX the guide Change the voice that the Mac uses to pronounce text.
Once the required voice is installed, Thorium will choose the voice corresponding to the language of the book.
It may happen that the book has the wrong language. In this case, Thorium allows you to change the voice to one that is present in the system via the Voice menu
- How can I transfer the entire book collection from one machine to another?
- Having a UI for exporting the whole catalog is not a priority currently.
The publications are stored in a well-known directory.
- on Windows10: C:\Users\myname\AppData\Roaming\EDRLab.ThoriumReader\publications\
- on MacOS: /Users/myname/Library/Application Support/EDRLab.ThoriumReader/
In case of a migration from one computer to another or similar usecases, you can copy all ebook files in this repository and open them in the new installation of Thorium.