## Best Free EPUB Converters 2026 — Ranked & Compared Looking for a free EPUB converter? Whether you need to convert DOCX, PDF, HTML, or plain text to EPUB, there's a tool on this list for you. We tested the most popular options to bring you an honest, comprehensive comparison. Our top pick for most people in 2026: **converter-epub.com** for browser-based conversions, and **Calibre** for desktop power users. --- ## Quick Comparison Table | Converter | Formats | Platform | Privacy | Watermarks | Ease of Use | |-----------|---------|----------|---------|------------|-------------| | converter-epub.com | DOCX, HTML, TXT | Browser | Excellent (local) | None | ⭐⭐⭐⭐⭐ | | Calibre | 30+ formats | Mac/Win/Linux | Excellent | None | ⭐⭐⭐⭐ | | OnlineConvertFree | PDF, DOCX, more | Browser | Varies | Possible | ⭐⭐⭐ | | Zamzar | 1,200+ formats | Browser | Good | None (email) | ⭐⭐⭐⭐ | | CloudConvert | 200+ formats | Browser | Good | None | ⭐⭐⭐⭐ | | LibreOffice | ODT, DOCX | Desktop | Excellent | None | ⭐⭐⭐ | --- ## #1 — converter-epub.com (Best for Browser-Based) **Formats:** DOCX, HTML, HTM, TXT → EPUB **Platform:** Browser (any OS) **Price:** Free, no account required converter-epub.com is a privacy-first EPUB converter that runs entirely in your browser. Your files never leave your device — all processing happens locally via JavaScript. ### Why It's Our #1 Pick - **Zero privacy risk** — files are processed locally, no server upload - **No watermarks** on output - **No sign-up, no email, no fees** - **Lightning fast** — conversions take seconds - **Clean, focused interface** — one job, done well ### What It Does Well - Preserves DOCX formatting including headings, lists, bold, and italic - Clean EPUB output compatible with all major ereaders - Simple three-step workflow: upload → set title/author → download - Works on Mac, Windows, ChromeOS, Linux — any browser ### What It Doesn't Do - Does not currently support PDF, MOBI, or AZW3 input - No batch conversion - No advanced formatting options ### Verdict If your source files are DOCX, HTML, or TXT, converter-epub.com is simply the best option in 2026. It's faster than any desktop app, safer than uploading to an online converter, and produces clean, well-structured EPUB files. **[Use converter-epub.com free →](https://converter-epub.com/)** --- ## #2 — Calibre (Best Free Desktop Converter) **Formats:** PDF, DOCX, EPUB, MOBI, AZW3, HTML, TXT, ODT, RTF, and 20+ more **Platform:** Mac, Windows, Linux **Price:** Free (open-source) [Calibre](https://calibre-ebook.com/) is the most powerful free ebook management tool available. It's been the go-to for ebook enthusiasts for over a decade, and its conversion engine handles even difficult PDFs better than most paid tools. ### Why It's Ranked #2 Calibre is incredibly powerful but has a steeper learning curve. For simple DOCX-to-EPUB conversions, it's overkill. However, when you need to handle PDFs, batch-convert hundreds of books, or manage a large library, Calibre is unmatched. ### Key Features - **30+ input/output formats** including PDF, MOBI, AZW3, EPUB, DOCX, HTML, ODT - **Library management** — organize, tag, search your entire ebook collection - **Ereader sync** — direct transfer to Kindle, Kobo, and most other devices - **Plugin ecosystem** — extend functionality with community plugins - **E-book viewer** built in — preview your EPUB before transferring - **OCR support** for scanned PDFs (requires adding the plugin) ### Calibre PDF Conversion Calibre's biggest strength is PDF handling. While PDF-to-EPUB is never perfect (PDFs are fixed-layout, EPUBs are reflowable), Calibre's heuristic processing does a better job than almost anything else at extracting clean text from PDFs. Enable **"OCR the input"** in the conversion settings for scanned PDFs, and Calibre will run Tesseract OCR to extract the text layer. ### Verdict Download Calibre if you: - Have PDFs to convert - Manage a large ebook library - Need MOBI or AZW3 output for Kindle - Want a one-time setup that serves you for years **[Download Calibre free →](https://calibre-ebook.com/)** --- ## #3 — Zamzar (Best for Occasional One-Offs) **Formats:** 1,200+ formats including PDF, DOCX, EPUB, MOBI **Platform:** Browser **Price:** Free tier (conversions up to 2GB, email delivery) Zamzar is a mature online conversion service that has been around since 2006. Its file conversion API powers thousands of websites, and the consumer-facing tool works well for occasional conversions. ### Why It's #3 Zamzar handles a massive range of formats and has reliable conversion quality. The trade-off is that files are uploaded to Zamzar's servers — not ideal for sensitive documents. The free tier emails you a download link, which feels dated compared to instant browser downloads. ### How It Works 1. Go to [zamzar.com](https://www.zamzar.com/) 2. Upload your file (up to 2GB on free tier) 3. Select EPUB as your target format 4. Enter your email address 5. Receive a download link when ready ### Privacy Consideration Files uploaded to Zamzar are processed on their servers and deleted after conversion (their policy states 24 hours). Don't use it for confidential documents. --- ## #4 — CloudConvert (Best for Quality Control) **Formats:** 200+ formats **Platform:** Browser **Price:** Free tier (25 minutes/day of conversion) CloudConvert offers more fine-grained control over conversion settings than most online tools. You can adjust specific parameters for different format pairs, giving you better output quality when the default settings don't work. ### Why It's #4 CloudConvert is reliable and handles edge cases better than simpler converters. The free daily limit (25 minutes) is generous enough for occasional users. The interface is less intuitive than Zamzar, but the quality control options are valuable. ### Notable Features - Detailed per-format conversion settings - Chaîne workflows (multiple conversions in sequence) - API access for developers - No watermarks on free tier --- ## #5 — LibreOffice (Best Free Desktop Writer) **Formats:** ODT, DOCX, RTF, TXT → EPUB (via Writer export) **Platform:** Mac, Windows, Linux **Price:** Free (open-source) LibreOffice Writer has a built-in EPUB export feature. It's a solid option if you're already working in LibreOffice and want to export your document as an ebook without installing additional software. ### How to Export EPUB from LibreOffice 1. Open your document in LibreOffice Writer 2. Go to **File** → **Save As** 3. Choose **EPUB** as the format 4. Set metadata (title, author, language) 5. Save ### Limitations LibreOffice's EPUB export is basic. Complex formatting, embedded media, and intricate layouts often don't translate perfectly. It's best for simple text documents. For DOCX files, converter-epub.com or Calibre typically produces better results. --- ## How We Tested We evaluated each converter on: 1. **Format support** — how many input formats actually work 2. **Output quality** — how clean and well-structured the resulting EPUB is 3. **Privacy** — whether files stay local or go to a server 4. **Ease of use** — how simple the conversion workflow is 5. **Speed** — from upload to downloadable EPUB 6. **Watermarks** — whether the free version imposes watermarks 7. **Platform availability** — works on major operating systems --- ## Which Converter Should You Use? | Use Case | Recommended Tool | |----------|----------------| | DOCX/HTML/TXT to EPUB, privacy-conscious | **converter-epub.com** | | PDF to EPUB, large library management | **Calibre** | | Occasional conversions, any format | **Zamzar** | | Fine-grained quality control | **CloudConvert** | | Already using LibreOffice | **LibreOffice Writer export** | | Batch conversion of 100+ files | **Calibre** | | Kindle MOBI/AZW3 output | **Calibre** | --- ## Conclusion For most people converting DOCX, HTML, or TXT files to EPUB in 2026, **converter-epub.com** is the fastest, safest, and simplest choice. Everything happens in your browser — no uploads, no wait times, no watermarks. For PDFs, complex formatting, or library management, **Calibre** remains the gold standard among free tools. **[Convert your files free at converter-epub.com →](https://converter-epub.com/)**