This page is designed to help you find out whether upub.app is good and if it is the right choice for you.
upub turns fixed PDF pages into real, reflowable EPUB text. Instead of shrinking a paper page onto a six-inch screen, it rebuilds the book: reading order, chapters, headings, footnotes and images. Running headers and page numbers are removed from the text flow.
Scanned PDFs are supported through AI-assisted OCR. Every page gets a confidence score, and pages that could not be verified are flagged in a downloadable quality report, so there are no silent errors.
Besides PDF, upub accepts DOCX, HTML, Markdown, images and audio. Output is validated EPUB 3, with 23 device profiles for Kindle, Kobo (native KEPUB), Apple Books, PocketBook, Onyx Boox and reMarkable. Text in any language is supported, including right-to-left and CJK scripts.
Pricing is pay-once: page-credit packs from $4.99 for 1,000 pages. There is no subscription and credits never expire.
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Scanned PDF support
AI-assisted OCR turns page images into real, resizable text
Per-page quality report
Every page is confidence-scored; uncertain pages are flagged, no silent errors
23 e-reader profiles
Tuned output for Kindle, Kobo (KEPUB), Apple Books, PocketBook, Boox and reMarkable
Most converters, online tools and even Calibre mostly extract characters and guess where paragraphs belong. With complex or scanned PDFs, the result is broken lines, page numbers inside sentences, or pages that stay as tiny images.
upub analyzes the page layout first, then packages a validated EPUB 3. It also tells you which pages it is unsure about, instead of hiding mistakes.
Pricing is pay once: credit packs from $4.99 for 1,000 pages, no subscription, and credits never expire.
E-reader owners (Kindle, Kobo, PocketBook, Boox, reMarkable) who have books, papers or course material only as PDFs, including scans, and are tired of zooming and panning on a small screen. Students, researchers and avid readers in any language, including right-to-left and CJK scripts.
upub started as a tool for one reader. A close friend had many books only as PDFs made for A4 paper, and on her e-reader she had to zoom, drag sideways and find her line again after every move. Existing converters flattened the books into screenshots, dropped headings and scrambled footnotes. So I wrote her a converter that understood the layout and returned a real EPUB with her font, her size and chapters where chapters belong. She read three books that week and said: "Don't keep this to yourself." upub is that same tool, now for everyone stuck with a PDF.
Python, FastAPI, PostgreSQL, Google Gemini (layout analysis and OCR), pdftext and PDFium for PDF parsing, Next.js with Tailwind CSS for the web app, Docker, and Polar for payments. Output is validated with W3C EPUBCheck.
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