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How to Read and Annotate EPUB Files on PocketBook InkPad 4 (2026 Guide)

The PocketBook InkPad 4 (released 2022, firmware updated through 2025–2026) is a 7.8-inch E Ink reader from PocketBook International. It stands out for its exceptionally wide native format support — EPUB, EPUB 3, PDF, DJVU, FB2, MOBI, RTF, TXT, CBZ and more — and for Bluetooth audio output, making it popular with readers who switch between reading and listening. This guide covers everything you need to load and enjoy EPUB files on the InkPad 4.

PocketBook InkPad 4 specifications

Spec	Detail
Screen	7.8-inch E Ink Carta 1200, 300 ppi, monochrome
Frontlight	SMARTlight adjustable warm/cold LED
Storage	32 GB internal; microSD slot up to 32 GB
Connectivity	Wi-Fi 802.11 b/g/n; Bluetooth 5.0; USB-C
Supported formats	EPUB, EPUB 3, PDF, DJVU, FB2, MOBI, RTF, TXT, CBZ, and more (over 20 formats)
Battery	2900 mAh; weeks per charge in reading mode
OS	Linux-based PocketBook OS

How to get EPUBs onto your PocketBook InkPad 4

Method 1: USB-C cable

Connect the InkPad 4 to your computer using the USB-C cable.
Select PC Link on the device.
Open the device in Finder or File Explorer and navigate to Books/.
Drag your EPUB files into the folder.
Eject and disconnect. EPUBs appear in the library immediately.

Method 2: PocketBook Cloud

Create a free PocketBook Cloud account and install the desktop or mobile app.
Upload your EPUB to the cloud library.
On the InkPad 4, open the PocketBook Store app or Settings → Accounts and enable Cloud sync. Your EPUB downloads automatically over Wi-Fi.

Method 3: Dropbox

The InkPad 4 supports Dropbox integration natively. Link your account in Settings → Accounts → Dropbox, then add EPUBs to your Dropbox Books folder and sync from the device.

Method 4: Send-to-PocketBook email

Register your device to get a personal @pbsync.com email address. Email an EPUB as an attachment and it arrives in your library via cloud sync.

Reader settings and EPUB customisation

Typography

Tap the centre of any page to open the reading menu. Adjust font family, size, line spacing, margins, and paragraph indentation. Sideload custom fonts by copying TTF/OTF files to the fonts/ folder.

SMARTlight

Swipe down from the top edge to access the brightness and colour temperature slider. The warm light setting reduces eye strain for evening reading sessions.

Annotation

Long-press any word to start a text selection. Tap Highlight to mark it in your choice of colour (yellow, green, blue, pink), or tap Note to add a typed comment. Export all annotations from the Notes app as a PDF or text file.

Converting PDFs to EPUB for the InkPad 4

Although the InkPad 4 reads PDFs natively, fixed-layout PDFs from journals, guidelines, or textbooks do not reflow to fit the 7.8-inch screen. Converting to EPUB first gives you:

Text that wraps correctly at any font size
Chapter navigation via the table of contents
Highlight and note support across the full document

Upload your PDF at toolkit.bot.
Click Convert and download the EPUB.
Transfer to the InkPad 4 via USB-C or PocketBook Cloud.

Frequently asked questions

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Can the PocketBook InkPad 4 open EPUB files natively?: Yes. The InkPad 4 supports EPUB (including EPUB 3) natively without any additional apps or conversion. Sideload via USB, Wi-Fi transfer, or Dropbox.
How do I transfer an EPUB to my PocketBook InkPad 4?: Connect via USB-C and drag the EPUB to the Books folder, use the PocketBook Cloud sync app, or send via Dropbox integration. The file appears in your library automatically.
Does the PocketBook InkPad 4 support custom fonts?: Yes. Copy TTF or OTF font files to the fonts/ folder on the device and select them from the reader's font settings.
Can I annotate EPUB files on the InkPad 4?: Yes. The InkPad 4 supports text highlights and typed notes in EPUB files. Annotations export to PDF or text via the Notes app.
What is the difference between InkPad 4 and InkPad Color 3?: The InkPad 4 has a monochrome E Ink Carta 1200 display for sharper text contrast. The InkPad Color 3 adds a colour E Ink layer for illustrated content. Both are 7.8 inches.