KinBo: Ebook & Manga Converter for Kindle & Kobo

Convert and optimize any eBook, document, manga, webtoon or comic file for your Kindle, Kobo, and E-Ink e-Readers. KinBo easily converts text eBooks (EPUB, PDF) and comic archives (CBZ, CBR, Mihon/image folders) into perfectly formatted, crystal-clear files tailored for your device screen.

⚡ WHAT IS KINBO?

KinBo is your all-in-one mobile eBook converter and E-Ink optimizer. It bridges the gap between your digital file library and your e-Reader—fixing washed-out text, awkward margins, broken formatting, and unsupported file types.

Whether you read text-heavy novels, PDFs, technical documents, or manga, KinBo reformats every file so you get crisp fonts, fast page turns, and ideal contrast on any E-Paper screen.

📚 UNIVERSAL EBOOK & DOCUMENT CONVERSION

• Reflowable Prose & Text Books: Convert text-native EPUB and PDF files with proper text extraction, allowing full font size control and line-spacing on your e-Reader.
• Native Kobo KEPUB Engine: Generate true KEPUB files with fast chapter navigation, accurate reading statistics, and full Table of Contents support.
• Custom Metadata Editor: Change Book Title, Author name, and cover images before converting so your e-Reader library stays organized.
• PDF Reflow & Re-Packaging: Clean up multi-column or fixed-layout PDFs into readable eBook formats.

🛠️ E-INK DISPLAY OPTIMIZATION TOOLS

• ✂️ Smart Margin Cropping: Trim unnecessary white borders from documents, PDFs, and comics to maximize text size on small screens.
• 🎚️ Custom Gamma & Contrast Control: Fix light, washed-out fonts or overly dark scans. Dial in mid-tones for deep blacks and clear whites.
• 🌗 E-Ink Grayscale Pro: Convert color PDFs and graphics into high-contrast grayscale to shrink file sizes and improve battery life.
• 🚀 AI Upscaling: Sharpen low-resolution text and artwork for high-DPI screens like Kindle Scribe, Kobo Libra, or BOOX.

📖 MANGA, COMICS & FOLDER SUPPORT

• Archive & Folder Converter: Turn CBZ, CBR, ZIP, RAR, and loose image folders (JPEG, PNG, WEBP) into structured eBooks.
• Mihon & Tachiyomi Compatibility: Convert downloaded chapter folders directly into Kindle & Kobo formats.
• 📖 Spread Splitter: Automatically splits double-page spreads into portrait pages or rotates them for optimal viewing.
• 🌈 Rainbow Eraser: Cleans up color noise, chromatic aberration, and banding artifacts from raw scans.

🔄 POPULAR CONVERSIONS

Convert easily between popular formats:
• EPUB to KEPUB (Native Kobo Optimization)
• PDF to EPUB (Text Extraction & Reflow)
• EPUB to PDF
• CBZ to EPUB / CBR to EPUB
• CBZ to KEPUB / CBR to KEPUB
• Mihon / Image Folders ➔ EPUB / KEPUB
• ZIP / RAR Archives ➔ E-Reader eBooks

🚀 WHY CHOOSE KINBO?

• 100% On-Device Processing: Conversions happen locally on your phone. Your private books and documents are never uploaded to external servers.
• Batch & Folder Processing: Select entire book series or folders and convert them all in one tap.
• Device-Specific Profiles: Optimized settings for Kindle Paperwhite, Oasis, Scribe, Kobo Clara, Kobo Libra, BOOX, PocketBook, reMarkable, and more.
• Sticky Settings: Saves your favorite screen presets and output formats for instant future conversions.

📁 SUPPORTED FORMATS

• Input: EPUB, PDF, CBZ, CBR, ZIP, RAR, and Image Folders (JPEG, PNG, WEBP, BMP).
• Output: EPUB, KEPUB (Kobo native), PDF, and CBZ.

💡 HOW IT WORKS IN 3 STEPS

1. Select File or Folder: Pick your text eBook, PDF, comic archive, or chapter directory.
2. Choose Profile: Select your target e-Reader (Kindle, Kobo, etc.) and adjust margins or contrast if needed.
3. Convert & Send: Tap Convert and transfer your file straight to your device via USB, Send-to-Kindle, or cloud!