The reader opens book files on your device. File tools upload over HTTPS for in-memory processing on our servers. Optional image optimization runs in your browser.

Nothing to install

Open a tool in your browser, choose your files, and download the result. Processing time depends on your files and the operation.

Respectful

Core tools are free within daily and file-size limits and may show ads. Pro removes ads and output branding, raises the limits, and adds AI covers. See our analytics, advertising and cookie-consent details.

7,168

Files processed

100%

Free core tools

Tools in the workshop

Installs required

Pricing

Free to start. Fair to scale.

Most tools are free forever. Upgrade when you need unlimited conversions, bigger files, or AI covers.

Free forever

$0 forever

Everything an occasional reader or student needs.

All essential EPUB tools
Files up to 5 MB (10 MB for PDF, 15 MB to split)
20 MB per operation
3 conversions per day
In-browser reader
No account required

Start free

MOST LOVED

Pro

$9 / mo, billed monthly

For self-published authors who ship books regularly.

Unlimited conversions
Operations up to 30 MB
AI Book Cover (30 / month)
No daily operation cap (free = 3/day)
Merge up to 50 files (free = 10)
REST API + MCP at 60 req/min (free = 15)
No Epublys branding on PDF output

Get Pro

Questions

Answers,
mostly short.

Can't find what you need? Email hello@epublys.com. Real humans, usually within a day.

Core tools (merge, split, compress, convert, validate, read) are free with no account required. File tools have daily and file-size limits; reading is unlimited. Pro adds higher limits, unbranded output, and AI covers.

The reader opens EPUB and PDF files on your device without uploading them. File tools send uploads over HTTPS to our servers, process them in memory, and discard them after returning the result.

EPUB 2 & 3, PDF, Markdown and DOCX (Word). We convert EPUB to and from PDF and Markdown, and DOCX to EPUB. MOBI and AZW3 are not supported — Calibre handles those.

No software installation is needed. Use Epublys in a modern browser such as Chrome, Safari, Firefox, or Edge.

Yes, the entire site works on phones and tablets. The in-browser reader is especially nice on tablets.

Yes. A REST API and an MCP server, both free to start. Read the docs, then get a key on your account page.

For developers

Built for AI agents and developers

Integrate EPUB tools directly into your AI workflows. Epublys exposes all tools via a REST API and an MCP server — so Claude, GPT, and any MCP-compatible AI can merge, split, compress, convert, and validate ebooks autonomously.

MCP Server Connect any MCP client. Streamable HTTP at /mcp

REST API JSON-based, OpenAPI 3.1 spec. Base64 file I/O

Free API key 5 MB files, 15 req/min. Pro for 30 MB & 60 req/min

Get your free API key Read the docs

              
              MCP Tool Call

{
  "method": "tools/call",
  "params": {
    "name": "merge_epub",
    "arguments": {
      "files": ["<base64>", "<base64>"],
      "title": "My Merged Book"
    }
  }
}

Learn

View all guides →

Free Online EPUB Tools

Epublys offers a complete suite of free tools to manage your EPUB ebook files. Whether you need to merge multiple EPUBs into a single book, split an EPUB by chapters, compress your EPUB to save space, convert EPUB to PDF, convert PDF to EPUB, export EPUB to Markdown, turn Markdown into an EPUB, convert a Word document to EPUB, edit ebook metadata, or validate your EPUB for compatibility — we have you covered.

File tools process uploads in memory on Cloudflare Workers without persistent file storage. The reader opens book files on your device, and optional image optimization runs in your browser. No software installation required.

All tools

Select EPUB files

or drop EPUBs here

Every tool you need to work with EPUBs, in one place.

Twelve tools. One quietlittle workshop.

Made by readers.Built for bookmakers.

Private by default

Nothing to install

Respectful

Free to start. Fair to scale.

Answers,mostly short.

Built for AI agents and developers

Popular Guides

New tools, features, and notes.

Free Online EPUB Tools

Related tools

Twelve tools. One quiet
little workshop.

Made by readers.
Built for bookmakers.

Answers,
mostly short.