Pre-process your library — everything runs in your browser
Drop files here
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.epub.txt.cbz.pdf
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How it works
Drop your ebooks and comics here. The processor runs entirely in your browser — nothing leaves your machine. Download the result, extract to your SD card, and SUMI will find everything pre-processed and ready to read.
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What you get
The download contains your source files in /books/ plus a pre-built /.sumi/cache/ with the exact binary format SUMI reads. Extract the ZIP to your SD card root — it merges with existing content.
Supported Formats
EPUB — Full chapter extraction, cover art, and text pagination matching SUMI's on-device layout.
TXT — Word-wrapped and paginated for the e-ink display.
CBZ — Comic page images converted to 1-bit BMP with Floyd-Steinberg dithering.
PDF — Text extraction and re-pagination for the reader.
Device Settings
Processed with: 480×800 portrait, 22px font, 30px margins, 1.4× line height. These match SUMI's defaults. If you change font size or margins on-device, cached text will re-process automatically.