Tools
EPUB to Markdown API
Submit any EPUB file. Get back the full text, metadata, author, and title as a readable Markdown document.
Try it below:
Turn EPUBs into Markdown
Upload an EPUB file or submit a URL, get Markdown back.
What is Exabase's EPUB to Markdown API?
Submit an EPUB file to the Exabase Extract API and get a Markdown document back instead of JSON. The same extraction pipeline runs: text extraction, metadata parsing, and thumbnail generation. Pass ?format=markdown when retrieving the result and you get a human-readable Markdown document with the book's content and metadata.
The Markdown output includes the title, author, page count, creation date, and MIME type at the top, followed by the extracted text. The result is ready to feed into an LLM context window, store in a knowledge base, or use as a readable reference.
What you get back
The Markdown response is a single text document. Book metadata appears at the top. The content follows as readable prose. You can also configure webhooks with webhookFormat: "markdown" so completed jobs POST the Markdown document directly to your server.
One multi-modal API
The same POST /v2/extract endpoint handles every content type Exabase supports, and ?format=markdown works across all of them. For EPUBs, you get book metadata and text. For PDFs, you get document metadata and (for recognised types) structured field extraction rendered as Markdown. For audio and video, you get the transcript. For images, you get OCR text.
The submission flow is identical across all types. The Extract docs cover each content type in detail.
What you can build with it
Feed book content directly into your agent's context window as readable Markdown. Build a learning copilot that references textbook content. Power a digital library where ebook text is stored and indexed as Markdown for search and retrieval.
Store extracted EPUBs as Resources in a Base and the content becomes searchable through Deep Search. Workers can process new uploads as they arrive.
Beyond Markdown
The Extract API also returns JSON (the default) with structured chunks and page numbers for programmatic processing. Use Markdown for LLM context and human review, JSON for search indexing and structured retrieval. The EPUB to JSON tool page covers the JSON output.
How do I use it?
Get your API key
Free, no credit card:
Sign up at exabase.io and copy your API key from the dashboard.
Submit an EPUB file
Using the SDK (Node.js):
Get Markdown back
Poll the job until state reaches completed, or skip polling entirely with webhooks.
One API call. No Calibre, no epub.js, no Markdown conversion.
Why Exabase
Comparisons
Works with other Exabase features
FAQs
What is Exabase?
Exabase is infrastructure for AI agents. It gives your agents memory, versioned file storage, AI deep search, and context automation through a set of APIs. Store what your agent learns, search inside any content type, and keep knowledge bases current automatically. Built for production use. Give your agent precise context and cut your token spend by up to 81%.
Who uses Exabase?
Developers and teams building AI agents, copilots, and RAG applications. If your agent needs to remember things between sessions, store and retrieve files, search across documents and media, or stay up to date without manual maintenance, Exabase handles that infrastructure so you can focus on your product.
How do I get Markdown instead of JSON?
Add ?format=markdown to the GET /v2/extract/{jobId} request. For webhooks, set webhookFormat: "markdown".
Can I still get JSON?
Yes. JSON is the default. For programmatic processing, Resume to JSON returns typed fields.
What EPUB versions are supported?
Both EPUB 2 and EPUB 3
Does it handle DRM-protected EPUBs?
No. The file must be unprotected.
Do I have to poll for results?
No. Configure a webhook with webhookFormat: "markdown".
How long are files retained?
1 day from job creation, then permanently deleted.
Is there an SDK?
Yes. The @exabase/sdk package for Node.js/TypeScript handles file streaming, job polling, and chunk retrieval. Install with npm install @exabase/sdk. Or call the REST API directly from any language.
What other document types does Extract recognise?
Invoices and contracts can also get extracted into Markdown. See the Invoice to JSON and Contract to JSON tool pages. General PDFs return text chunks and metadata without the structured object. The same endpoint also handles images, audio, video, and web pages.
Other tools
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