AZW to AZW3 Converter
Convert AZW to AZW3 online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
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Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
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.
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.
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 AZW file?
The AZW format is Amazon's proprietary eBook file type, fundamentally based on the Mobipocket (MOBI) standard but encapsulated with Amazon's digital rights management (DRM) scheme. Structurally, it utilizes a Palm Database (PDB) container format and typically implements PalmDOC (LZ77) or Huffman compression algorithms to store reflowable text and low-resolution raster images. Originally introduced with the first Kindle in 2007, it is restricted to the Amazon ecosystem and lacks the advanced styling capabilities found in the newer KF8 standard.
How to open an AZW file
Due to inherent DRM encryption, AZW files are natively readable only on Amazon Kindle hardware and the Kindle application for Windows, macOS, iOS, and Android. For non-DRM AZW files, open-source eBook management software such as Calibre can decode and convert the content, though modifying DRM-protected files requires circumvention tools that may violate terms of service.
AZW Technical Info
- Full Name
- Amazon Kindle eBook Format
- Developed By
- Amazon
- Initial Release
- 2007
- MIME Type
- application/vnd.amazon.ebook
What is an AZW3 file?
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.
AZW3 Technical Info
- Full Name
- Kindle Format 8
- Developed By
- Amazon
- Initial Release
- 2011
- MIME Type
- application/vnd.amazon.ebook
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The fastest way to convert any file
Purpose-built for speed, privacy, and breadth of format support.
Convert AZW to AZW3 in seconds
Every AZW to AZW3 conversion runs on our servers, so your device stays fast and the output quality stays intact.
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No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
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Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
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Developer API
Convert AZW to AZW3 via API
Automate AZW to AZW3 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": "azw-to-azw3",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "azw3"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.azw
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$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.