Yes. The essential tools (merge, split, compress, convert, validate, read) are 100% free with no account required. We offer paid plans for power users who need unlimited conversions, larger files, and AI features.

Everything is processed in your browser whenever possible. Files that need server processing are encrypted in transit, processed in memory, and never written to disk or persistent storage.

EPUB 2 & 3, PDF, MOBI, AZW3, DOCX, HTML, and plain text. We can convert between most pairs.

No. Epublys runs entirely in your browser. Chrome, Safari, Firefox, Edge all work. Drop a file and go.

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

An API is in private beta. Reach out if you'd like early access.

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 10 MB files, 15 req/min. Pro for 100 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"
    }
  }
}

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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, edit ebook metadata, or validate your EPUB for compatibility — we have you covered.

All tools run on secure Cloudflare Workers. No software installation required. Your files are processed in memory and never written to disk or any persistent storage.

All tools

Select EPUB files

or drop EPUBs here

Select EPUB files

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

Nine tools. One quietlittle workshop.

Made by readers.Built for bookmakers.

Private by default

Fast, really

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

Nine tools. One quiet
little workshop.

Made by readers.
Built for bookmakers.

Answers,
mostly short.