pdfcosmos

PDF to EPUB

Turn your PDFs into reflowable ebooks, privately, without uploading a thing.

Free, fast, and privacy-first.

Convert PDF to EPUB

or drag & drop files here

PDF filesup to 30 filesup to 100 MB each300 MB total

Convert PDF to EPUB: read your PDFs anywhere, privately

Turn a PDF into a reflowable EPUB so it's comfortable to read on a phone, Kindle, or Kobo (with adjustable text size) instead of a fixed page. pdfcosmos extracts the text and builds the ebook entirely in your browser, so your documents never leave your device.

Headings and paragraphs are inferred from the text for a clean reading experience. It's a best-effort reflow (no layout, columns, or images), ideal for text-first documents. Run OCR on scans first.

  • Reflows to any screen

    Adjustable font size, with no more pinch-and-zoom on a phone.

  • Reader-ready EPUB 3

    Opens on Kindle, Kobo, Apple Books, and phone readers.

  • Private by design

    Extracted and packaged in your browser. Nothing is uploaded.

  • Batch to one ZIP

    Convert up to 30 files at once. Several download together as a ZIP.

How to convert PDF to EPUB

  1. Add your PDF(s)

    Drop one (or up to 30) PDF files into the upload area.

  2. Convert

    Click “Convert to EPUB”. The selectable text of each page is read in your browser.

  3. Download & read

    Each PDF downloads as an .epub (a ZIP for several). Open it on a Kindle, Kobo, or phone reader.

Frequently asked questions

Are my PDFs uploaded to a server?
No. Extraction and packaging run entirely in your browser. Your files never leave your device. You can confirm it in your browser's Network tab: no file data is sent.
Why convert a PDF to EPUB?
EPUB reflows to fit any screen, so a PDF becomes comfortable to read on a phone, Kindle, or Kobo (with adjustable font size) instead of a fixed page you have to pinch and zoom.
How good is the result?
It's a best-effort reflow of the PDF's text, with headings and paragraphs inferred. Complex layout, columns, tables, and images aren't reconstructed. It's ideal for text-first documents. Scanned PDFs need OCR first.
Can I convert several files at once?
Yes. Add up to 30 files. One downloads as an .epub, and two or more download together as a single ZIP.
Is PDF to EPUB free?
Yes, it's completely free to use, with no sign-up and nothing to install.