I Built a Free PDF to EPUB Converter (Because Smallpdf Charges for That)

Description and use

A free, client‑side PDF to EPUB converter that runs entirely in the browser, keeping files local and avoiding subscription costs.

Problem

Converting a large PDF manuscript to EPUB using online services was costly and posed privacy risks, as free conversions were limited and files were uploaded to third‑party servers.

Outcome

A fully functional, free, offline PDF‑to‑EPUB converter that preserves metadata and navigation, with no server involvement or subscription fees.

Workflow

• 1. Open the single HTML file in a browser.
• 2. Drag & drop or click to browse and upload the PDF.
• 3. Preview page thumbnails and set book metadata (title, author, language).
• 4. Optionally add custom chapter titles per page or use one‑chapter mode.
• 5. Click download to receive a valid EPUB 3 file.
• 6. Open the EPUB in any e‑reader (Calibre, Apple Books, etc.).

Evidence

Everything happens locally using pdf.js and JSZip. Your files never leave your device.

Source

A valid EPUB 3 file that opens in Calibre, Apple Books, Google Play Books, Kindle Previewer, or any standard e-reader.

Source