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AZW4 to OEB Converter

Convert AZW4 to OEB online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

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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.

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.

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.

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.

What is an AZW4 file?

AZW4 is a proprietary format designated by Amazon as 'Print Replica', specifically designed for textbooks and PDFs where page layout preservation is critical. Technically, an AZW4 file consists of a standard PDF file wrapped within a Palm Database (PDB) container, often adding a layer of Amazon's DRM. Unlike reflowable AZW3 files, AZW4 maintains static pagination and formatting, effectively acting as a wrapper that allows PDF content to interact with the Kindle ecosystem's annotation and highlighting features.

How to open an AZW4 file

AZW4 files are intended for use on larger screens and are best viewed using the Kindle App for PC and Mac, or Fire Tablets; they are often incompatible with older E Ink Kindles due to display limitations. If the file is DRM-free, users can extract the underlying PDF using software like Calibre or specific Python scripts designed to unwrap the PDB container.

AZW4 Technical Info

Full Name
Kindle Print Replica
Developed By
Amazon
Initial Release
2011
MIME Type
application/vnd.amazon.ebook

What is an OEB file?

The Open eBook (OEB) format, formally defined by the Open eBook Publication Structure (OEBPS) specification, is a legacy XML-based standard developed by the Open eBook Forum (now IDPF) in 1999. It acts as a manifest file (typically with an .opf extension) that references a package of HTML or XHTML content, CSS stylesheets, and Dublin Core metadata. As the immediate predecessor to the modern EPUB standard, OEB established the structural protocols for separating content from presentation in digital publishing.

How to open an OEB file

OEB files are not natively executable on standard operating systems. To view the content properly assembled, users must utilize dedicated eBook software such as Calibre, which parses the OEBPS manifest to display the book. While the underlying XML and HTML components can be viewed in standard text editors like Notepad++ or Visual Studio Code, this does not render the formatted eBook experience.

OEB Technical Info

Full Name
Open eBook Publication Structure
Developed By
Open eBook Forum
Initial Release
1999
MIME Type
application/x-oeb1-document

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Why RunConvert

The fastest way to convert any file

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

Convert AZW4 to OEB in seconds

Every AZW4 to OEB 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 AZW4 to OEB via API

Automate AZW4 to OEB conversions in three steps: create a job, upload your file, then poll for the result.

# 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": "azw4-to-oeb",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "oeb"
      },
      "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.azw4

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

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