Convert EPUB → AZW3 Online — Free
Convert EPUB to Amazon Kindle AZW3 format.
Drag & drop or click to browse
Accepts .epub files up to 50 MB
Free plan includes 3 conversions/day. Need more? Talk to us →
What is a .epub file?
EPUB is a widely-used format in the eBook category. Convert EPUB to Amazon Kindle AZW3 format. Files in this format are commonly used across various tools, pipelines, and workflows.
What is a .azw3 file?
AZW3 is a popular format in the eBook ecosystem. Converting from EPUB to AZW3 gives you access to its unique features, broader tooling support, and improved interoperability.
How to convert EPUB → AZW3 online
Upload your file
Drag & drop your .EPUB file onto the upload zone, or click "Browse" to select it.
Validate & preview
The tool checks the file type and size before uploading. Invalid files are rejected immediately with a clear error.
Convert on the server
Click "Convert" to upload and process your file. Server-side conversion typically takes ~30 seconds.
Download your result
When done, click "Download .AZW3" to save your converted file. Files are securely deleted after 1 hour.
Frequently asked questions
Is this EPUB to AZW3 converter free?
Yes. The EPUB → AZW3 tool is free for up to 3 conversions per day. Pro (30/day) and Business (unlimited) plans unlock higher limits.
Is my file secure on the server?
Your file is uploaded over an encrypted HTTPS connection to a secure server worker. The converted file is stored temporarily and automatically deleted after 1 hour. We never share or store your files longer than necessary.
What is the maximum file size for EPUB?
You can convert files up to 50 MB. If your file is larger, consider compressing it first or upgrading to a Business plan for increased limits.
What is the difference between EPUB and AZW3?
EPUB and AZW3 are both formats in the eBook category, each with different use cases, tooling support, and feature sets. Convert EPUB to Amazon Kindle AZW3 format.
Can I convert multiple files at once?
Batch conversion is available on Pro and Business plans. Free users convert one file at a time.