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EPUB Converters & Tools

Convert EPUB ebook to and from every popular format — right in your browser. Toolspace ships 6 client-side EPUB converters and utilities that work without uploading a single byte.

Every tool runs in your browser — files never upload anywhere.

AZW3 to EPUB
Convert AZW3 file to EPUB file
EPUB to AZW3
Convert EPUB file to AZW3 file
EPUB to MOBI
Convert EPUB file to MOBI file
EPUB to PDF
Convert EPUB file to PDF file
MOBI to EPUB
Convert MOBI file to EPUB file
PDF to EPUB
Convert PDF file to EPUB file

Frequently asked questions

Are these EPUB converters free?

Yes — every EPUB tool on Toolspace is 100% free with no signup, watermarks, or file-count limits.

Do my EPUB files upload to a server?

No. All EPUB conversions run entirely inside your browser using WebAssembly and Canvas APIs, so your files never leave your device.

What is the largest EPUB file I can convert?

There's no hard limit — since the work happens in your browser, the practical ceiling is your device's available RAM. Most modern devices handle EPUB files up to several GB without issue.

Which browsers work with Toolspace EPUB tools?

Chrome, Edge, Firefox, and Safari on both desktop and mobile. For the best speed with video/audio conversion, use a Chromium-based browser (Chrome/Edge) on desktop.