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AZW3 to EPUB Converter

Convert AZW3 to EPUB online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. 01

    Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. 02

    Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. 03

    Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

AZW3 to EPUB

Why convert AZW3 to EPUB?

AZW3 and EPUB are both ebook formats: AZW3 is best for current Kindle ebooks, EPUB for ebooks that reflow to fit any screen.

  • Where EPUB works best

    Ebooks that reflow to fit any screen.

AZW3 vs EPUB: what's the difference?

PropertyAZW3EPUB
TypeEbookEbook
EditableNoNo
Opens inKindle devices and the Kindle appApple Books, Kobo, Google Play Books and most e-readers
Best forCurrent Kindle ebooksEbooks that reflow to fit any screen

What is an AZW3 file?

Kindle Format 8

Developed By
Amazon
Initial Release
2011
MIME Type
application/vnd.amazon.ebook

AZW3, also known as Kindle Format 8 (KF8), is the successor to the original AZW standard, engineered to support a subset of HTML5 and CSS3 specifications. Unlike its predecessor, AZW3 enables advanced formatting features including Scalable Vector Graphics (SVG), embedded fonts, and complex layouts within a proprietary binary wrapper. The format structure is a compiled database that allows for both reflowable content and fixed-layout elements, catering to the rendering capabilities of fourth-generation and later Kindle E Ink devices.

How to open an AZW3 file

Primary support is provided by Amazon Kindle devices (Generation 4+) and the official Kindle reading apps. For desktop viewing without Amazon software, Calibre and SumatraPDF (Windows) offer rendering support for DRM-free AZW3 files. Users on Linux can utilize eBook viewers like FBReader or coolreader provided the files are unencrypted.

What is an EPUB file?

Electronic Publication

Developed By
IDPF / W3C
Initial Release
2007
MIME Type
application/epub+zip

EPUB (Electronic Publication) is an open e-book standard maintained by the World Wide Web Consortium (W3C), originally developed by the International Digital Publishing Forum (IDPF). It utilizes the Open Container Format (OCF) based on ZIP compression to package XHTML content, CSS styling, and XML metadata. EPUB supports reflowable content, allowing text to adapt to various screen sizes, and fixed-layout rendering for graphic-heavy publications. The current version, EPUB 3.2, supports HTML5, SVG, and JavaScript interactivity.

How to open an EPUB file

EPUB files require dedicated e-reader software as most operating systems do not natively render them. On desktop environments (Windows/macOS/Linux), Calibre is the industry-standard management tool, while Adobe Digital Editions handles DRM-protected files. For mobile devices, Apple Books (iOS) and Google Play Books (Android) provide native rendering. Browser-based extensions like EPUBReader for Chrome allow viewing without standalone software.

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • Convert AZW3 to EPUB in seconds

    Every AZW3 to EPUB conversion runs on our servers, so your device stays fast and the output quality stays intact.

  • Fast, cloud-powered

    No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

  • Secure & private

    Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

  • Free - no account needed

    Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert AZW3 to EPUB via API

Automate AZW3 to EPUB conversions in three steps: create a job, upload your file, then poll for the result.

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "azw3-to-epub",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "epub"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.azw3

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

FAQ

Frequently asked questions

Common questions about converting AZW3 to EPUB with RunConvert.

Upload your .azw3 file, select EPUB as the output format, and click Convert. EPUB can then be opened on non-Kindle e-readers and apps.

AZW3 is Amazon's proprietary Kindle format, while EPUB is supported by nearly every other e-reader and reading app, including Apple Books and Kobo.

Ready to convert AZW3 to EPUB?

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