Free Online Converter

Convert PDF to EPUB
Instantly & Privately

Extract text from any PDF and generate a valid EPUB 3 e-book — entirely in your browser. No server upload. No account. No waiting.

Client-side only Files never leave your device Valid EPUB 3 output No file size limit

Book Title

Author

Chapter Split Per PageBy HeadingSingle Chapter

Font Size Small (14px)Medium (16px)Large (18px)XL (20px)

Drop your PDF here

Drag & drop a PDF file or click to browse. Supports text-based PDFs of any size.

Choose PDF File

document.pdf

0 KB

Remove

Initializing… 0%

Loading PDF with PDF.js

Extracting text from pages

Structuring chapters

Building EPUB package

Generating download file

An error occurred. Please try again.

EPUB Generated Successfully

Ready for download

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Pages

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Chapters

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Words

Download EPUB File

Convert to EPUB Reset

Why Use This Converter?

No Server Upload

Your PDF is processed 100% inside your browser using PDF.js. Nothing is sent to any server.

EPUB 3 Standard

Generates valid EPUB 3 files compatible with Kindle (via calibre), iBooks, Kobo, and all major e-readers.

Auto Chapter Detection

Automatically splits content into chapters by heading or per page — configurable before conversion.

Fast Processing

Processes most PDFs within seconds, leveraging native browser APIs and WebWorkers via PDF.js.

Text Extraction

Extracts and preserves all text content from text-based PDFs with proper paragraph spacing.

Fully Free

No subscription, no watermark, no login required. Unlimited conversions, always free.

How It Works

01

Upload PDF

Drag & drop or browse to select your PDF file.

02

Configure

Set title, author, chapter split mode, and font size.

03

Convert

Click Convert — PDF.js extracts text and builds EPUB in seconds.

04

Download

Download the .epub file and open it in any e-reader.

Frequently Asked Questions

Is my PDF file uploaded to a server?

No. This tool runs entirely in your browser using PDF.js and JSZip. Your file is never uploaded to any server. It remains on your device throughout the process — 100% private.

What types of PDFs can be converted?

Text-based PDFs (digitally created documents, e-books, reports) are fully supported. Scanned/image-only PDFs require OCR preprocessing — this tool focuses on PDFs with embedded text data.

Can I open the EPUB on Kindle?

Kindle natively supports EPUB (since 2022). Older Kindles require converting to MOBI using Calibre (free). The EPUB also opens directly in Apple Books, Kobo, Google Play Books, and Readium.

Is there a file size limit?

There is no artificial limit. The practical limit is your browser's available memory. Most modern browsers handle PDFs up to 200–500MB without issue, depending on RAM.

What does the "Chapter Split" option do?

By Heading — detects ALL-CAPS or short lines as headings and creates a chapter break. Best for books and reports.

Per Page — each PDF page becomes its own EPUB chapter. Good for presentations.

Single Chapter — all text goes into one chapter. Best for short documents.

`);/* ── Chapter files ── */ const chapterManifestItems = []; const chapterSpineItems = []; const tocPoints = [];for (let i = 0; i < chapters.length; i++) { const ch = chapters[i]; const chId = `chapter${String(i + 1).padStart(3, '0')}`; const chFile = `${chId}.xhtml`; const chTitle = ch.title || `Chapter ${i + 1}`;// Format content: split by double newlines → paragraphs const paragraphs = ch.content .split(/\n\n+/) .map(p => p.replace(/\n/g, ' ').trim()) .filter(p => p.length > 0) .map(p => `

${escapeXml(p)}

`) .join('\n');const xhtml = `

${escapeXml(chTitle)}

${paragraphs || '

(No text content on this page)

'} `;text.file(chFile, xhtml); chapterManifestItems.push(` `); chapterSpineItems.push(` `); tocPoints.push({ id: chId, file: `Text/${chFile}`, title: chTitle, order: i + 2 }); }/* ── content.opf ── */ oebps.file('content.opf', ` ${escapeXml(title)} ${escapeXml(author)} en ${uid} SnapToolSet PDF to EPUB Converter${now} ${chapterManifestItems.join('\n')} ${chapterSpineItems.join('\n')} `);/* ── toc.ncx ── */ const ncxNavPoints = tocPoints.map(p => ` ${escapeXml(p.title)} `).join('');oebps.file('toc.ncx', ` ${escapeXml(title)} Cover ${ncxNavPoints} `);/* ── nav.xhtml (EPUB 3 navigation) ── */ const navItems = tocPoints.map(p => `

${escapeXml(p.title)}

` ).join('\n');oebps.file('nav.xhtml', ` `);return zip; }/* ======================== UTILITIES ======================== */ function readFileAsArrayBuffer(file) { return new Promise((resolve, reject) => { const reader = new FileReader(); reader.onload = e => resolve(e.target.result); reader.onerror = () => reject(new Error('Failed to read file')); reader.readAsArrayBuffer(file); }); }function escapeXml(str) { if (!str) return ''; return String(str) .replace(/&/g, '&') .replace(//g, '>') .replace(/"/g, '"') .replace(/'/g, '''); }function generateUUID() { return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => { const r = Math.random() * 16 | 0; const v = c === 'x' ? r : (r & 0x3 | 0x8); return v.toString(16); }); }/* ======================== DOWNLOAD ======================== */ btnDownload.addEventListener('click', () => { if (!epubBlob) return; const url = URL.createObjectURL(epubBlob); const a = document.createElement('a'); a.href = url; a.download = epubFilename; document.body.appendChild(a); a.click(); document.body.removeChild(a); setTimeout(() => URL.revokeObjectURL(url), 5000); });/* ======================== RESET ======================== */ function resetTool() { selectedFile = null; epubBlob = null; fileInput.value = ''; bookTitle.value = ''; bookTitle.placeholder = 'Auto-detected from PDF'; bookAuthor.value = ''; filePreview.classList.remove('active'); btnConvert.disabled = true; hideError(); hideResult(); resetProgress(); }/* ======================== FAQ ACCORDION ======================== */ function toggleFaq(el) { const item = el.closest('.faq-item'); const wasOpen = item.classList.contains('open'); document.querySelectorAll('.faq-item.open').forEach(i => i.classList.remove('open')); if (!wasOpen) item.classList.add('open'); }