Convert PDF to EPUB
Convert PDF to reflowable EPUB 3.2 for Kindle Paperwhite (Send-to-Kindle), Kobo Libra, iPad Books. Tesseract OCR for scans (80+ langs), PDF/UA-1 accessibility, MathML preserved.…
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Why choose iFillPDF
Reflowable text
Text adapts to the screen size of your e-reader — a 4-column PNAS academic paper becomes single-column reflowable on a 6-inch Kindle Paperwhite, font size adjustable from 8pt to 24pt, with proper hyphenation tables for English…
Kindle, Kobo compatible
Standard EPUB, openable on every e-reader and reading app.
Built-in OCR
Scanned PDFs converted to selectable-text EPUBs via 80+-language OCR.
EU-hosted, GDPR
Your files are stored in Frankfurt (EU), encrypted at rest with AES-256.
Convert any PDF — academic papers (PNAS, arXiv, JSTOR), self-published manuscripts, IRS Pub 17 tax guides, scanned 1970s legal treatises, multi-column technical datasheets, Companies House annual report filings — into a fully reflowable EPUB 3.2 ebook with adjustable font size, dyslexia-friendly OpenDyslexic-ready CSS, and re-flowable line breaks that work on Kindle Paperwhite (via Send-to-Kindle email, since Amazon dropped MOBI in November 2022 in favor of EPUB), Kobo Libra Colour, Apple iPad Books, Bookeen Diva HD, PocketBook InkPad and any compliant e-reader. Built-in Tesseract-grade OCR (80+ languages including CJK, Arabic right-to-left, Cyrillic, Hebrew, Thai) automatically converts scanned image-only PDFs into selectable, reflowable, screen-reader accessible EPUBs — useful for academic researchers digitizing pre-1995 PDFs without a text layer. Output is fully W3C EPUB Core Media Type compliant with valid OPF manifest, NCX and toc.xhtml navigation, embedded OpenType fonts, MathML preserved as crisp vectors and PDF/UA-1 (ISO 14289-1) accessibility tags carried through. Unlike CloudConvert (25 free conversions/day then $8/mo Lite tier), Smallpdf ($9/mo Pro after 2 free tasks/day, Switzerland), Adobe Acrobat Pro ($19.99/mo plus desktop install, US Cloud Act 50 USC §3024), Convertio (10 MB free cap), online-convert.com (50 MB cap), CleverPDF or the free Calibre desktop client (steep CLI learning curve, no neural reflow): processing runs on Hetzner Falkenstein eu-central-1, fully EU-resident under TADPF EU-US Data Privacy Framework, AES-256 at rest, TLS 1.3 in transit, SOC 2 Type II, ISO 27001:2022, ICO UK registered, files purged within 24h. GDPR Art. 5(1)(c) data minimization compliant. Unlimited free use with a watermark and 0 AI Deep Detect, no card, no signup.
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E-signature proof log, business templates, no watermark. $8.99, one payment, for life — no subscription.
Frequently asked questions
Is it really free?+
Yes — unlimited free use with a watermark and 0 AI Deep Detect, then $8.99/mo Start for 8 AI Deep Detect/mo. No credit card required for the free plan.
Is my data safe?+
Yes — we host in Frankfurt (EU), AES-256 at rest. GDPR-compliant, never used to train third-party AI.
How does iFillPDF compare to CloudConvert, Smallpdf, Adobe Acrobat Pro and Calibre for converting PDF to EPUB?+
Five concrete differences: (1) Pricing — CloudConvert is 25 free conversions/day then $8/mo Lite ($0.025 per conversion pay-as-you-go), Smallpdf gates the converter behind Pro at $9/mo after 2 free tasks/day, Adobe Acrobat Pro is $19.99/mo plus mandatory desktop install and Adobe ID, Convertio caps free uploads at 10 MB, Calibre is free desktop only (200 MB install, no web access). iFillPDF gives you unlimited free use with a watermark and 0 AI Deep Detect with no card, then $8.99/mo Start for 8 AI Deep Detect/mo. (2) OCR for scans — Smallpdf free does not OCR scans (gates behind Pro), CloudConvert free does not OCR (paid plugin only), Calibre requires a separate Tesseract install via command line. iFillPDF includes Tesseract-grade OCR in 80+ languages (CJK, Arabic RTL, Cyrillic, Hebrew, Thai) on every plan, including free. (3) Reflow quality on multi-column papers — Calibre collapses figure captions into running text, CloudConvert strips MathML to images (lose selectability), Smallpdf re-flows but loses citation back-references. iFillPDF rebuilds the EPUB navigation document (toc.xhtml) per W3C EPUB 3.2 with chapter hierarchy, preserves MathML as crisp vectors, keeps citation cross-references as PDF/EPUB hyperlinks. (4) Kindle compatibility — since Amazon dropped MOBI in November 2022, the official Send-to-Kindle (sendtokindle@kindle.com) flow accepts EPUB only; iFillPDF outputs Send-to-Kindle-ready EPUB 3.2 with proper Kindle Format X (KFX) container fallback. CloudConvert and Smallpdf output generic EPUB without Kindle-specific KF8 styling. (5) Data residency — Smallpdf is Switzerland (outside EEA), CloudConvert is Germany (good), Adobe is US under Cloud Act 50 USC §3024 reach. iFillPDF runs on Hetzner Falkenstein eu-central-1 with SOC 2 Type II, ISO 27001:2022, ICO UK registered.
Will the EPUB work on Kindle Paperwhite now that Amazon dropped MOBI in 2022?+
Yes — and that is actually the recommended path post-November 2022. Amazon retired MOBI as the Send-to-Kindle ingestion format and now accepts EPUB directly via the official sendtokindle@kindle.com email flow and the Send-to-Kindle browser extension. Our EPUB 3.2 output is validated against the Amazon Kindle Direct Publishing (KDP) EPUB specification — proper OPF manifest, NCX fallback (for Kindle 1st-7th gen), KF8-compatible CSS, embedded fonts subset for Kindle Paperwhite (6-inch 300 ppi e-ink), Kindle Oasis (7-inch) and Kindle Scribe (10.2-inch) screen sizes. The same EPUB works without modification on Kobo Libra Colour, Kobo Clara BW, Apple iPad Books, Bookeen Diva HD, PocketBook InkPad Color 3 and any compliant e-reader. For users who specifically want MOBI for a pre-2017 Kindle without internet access, use our /tools/pdf-to-mobi flow instead; for AZW3 (the legacy Amazon proprietary format), see /tools/pdf-to-azw3. Note: DRM-protected PDFs (rare, used by some library lending platforms like OverDrive) cannot be converted — that is an Adobe DRM restriction, not an iFillPDF limitation, and applies equally to Calibre, CloudConvert, Smallpdf and every other converter on the market.
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