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How to Read and Annotate EPUB Files on Supernote A6X2 (2026 Guide)

The Supernote A6X2 (released 2023, updated firmware 2024–2026) is Ratta's compact E Ink writing tablet. At 7.8 inches it is pocketable yet large enough for comfortable EPUB reading and handwritten annotation. Unlike most E Ink readers, it ships with an OS built for handwriting-first workflows — making it popular with academics, clinicians, and writers who want a paper-like note-taking experience alongside their reading library.

Supernote A6X2 specifications

Spec	Detail
Screen	7.8-inch E Ink Carta 1200, 300 ppi, monochrome
Stylus	Ceramic-tip Heart of Heart stylus (no charging required); also supports standard nibs
Storage	32 GB internal
Connectivity	Wi-Fi 802.11 b/g/n/ac; USB-C (data + charge)
OS	Supernote OS (Android-based, closed ecosystem)
Supported formats	EPUB, PDF, DJVU, PNG, JPG, TXT, CBZ
Battery	3000 mAh; weeks per charge in mixed use

How to get EPUBs onto your Supernote A6X2

Method 1: USB-C cable (fastest)

Connect the A6X2 to your computer via the supplied USB-C cable.
Select File Transfer mode on the device.
Open the device in Finder or File Explorer and navigate to Document/.
Drag your EPUB files into that folder.
Eject and disconnect. Your files appear in the Document library immediately.

Method 2: Supernote Cloud

Install the Supernote Partner app on your phone or use the web portal.
Upload your EPUB to the Document folder in the cloud.
On your A6X2, pull down the notification shade and tap Sync. The EPUB downloads automatically.

Method 3: Dropbox or third-party cloud

The A6X2 supports Dropbox integration. Add EPUBs to your connected Dropbox folder and sync from the device settings.

Reading and annotation features

Built-in EPUB reader

The native reader supports custom fonts (sideload TTF/OTF to the Font/ folder), adjustable line spacing, margins, and font size. The A6X2 renders reflowable EPUB cleanly — ideal for converted medical guidelines, academic papers, or non-fiction books.

Handwritten annotation

Use the ceramic-tip stylus to write margin notes directly on EPUB pages. The A6X2's stylus lag is exceptionally low for an E Ink device. Notes are saved as an overlay layer; you can export them alongside the document.

Highlight and bookmark

Tap and drag to highlight text; add a typed or handwritten note to any highlight. Bookmarks appear in the side panel for quick navigation across long documents.

Converting PDFs to EPUB for the A6X2

Many professional PDFs — clinical guidelines, research papers, government reports — reflow poorly as PDFs. Converting them to EPUB first gives you:

Text that adapts to your font-size preference
Correct line breaks for the A6X2's 7.8-inch screen
Searchable, annotatable prose rather than fixed-layout images

Upload your PDF at toolkit.bot.
Click Convert and download the EPUB.
Transfer to the A6X2 via USB-C or Supernote Cloud.

Frequently asked questions

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Can the Supernote A6X2 open EPUB files natively?: Yes. The A6X2 built-in reader supports EPUB directly. Sideload via USB, Supernote Cloud, or Dropbox and the file appears in your Document library automatically.
How do I transfer an EPUB to my Supernote A6X2?: Connect via USB-C and drag the EPUB to the Document folder, or use Supernote Cloud sync. You can also email the file to your device address if you have the feature enabled.
Can I annotate EPUB files on the A6X2?: Yes. The A6X2 supports highlight and handwritten margin notes in EPUB files using the ceramic-tip stylus. Annotations are saved inside the file.
Does the Supernote A6X2 support custom fonts?: Yes. You can sideload TrueType or OpenType fonts into the Font folder and select them from the reader's font settings for both EPUB and PDF files.
What is the difference between Supernote A6X2 and A5X2?: The A6X2 has a 7.8-inch screen (same as a Kobo Libra or Kindle Oasis) while the A5X2 uses a larger 10.2-inch display. The A6X2 is more pocketable; the A5X2 is better for A4 documents and PDF annotations.