Free online BMP to AZW3 converter

Source format

BMP is a bitmap image format originally associated with Microsoft Windows. It stores raster graphics with little or no compression, which makes it simple and widely supported but often large in file size. BMP files are commonly used for screenshots, icons, scanned images, test graphics, and other situations where preserving pixel data is more important than minimizing storage.

Target format

AZW3 is Amazon’s Kindle Format 8 ebook format. It is used on Kindle devices and in Kindle apps for reflowable ebooks, and it supports richer layout features than older Kindle formats. AZW3 is useful for ebooks that need embedded images, styled text, and better typography for reading on Kindle-compatible devices.

How to perform the conversion

Converting BMP to AZW3 usually means placing one or more BMP images into an ebook container and then building a Kindle ebook file. The best desktop tool for this is often Calibre, because it can create AZW3 files and manage image-based or illustrated ebooks.

1. Prepare your BMP image or images. If you want a single-image ebook, decide whether the image should be the whole page or part of a larger layout.
2. If needed, create a simple HTML file that references the BMP image. For example, save a file named index.html with an <img> tag pointing to the image file.
3. Open Calibre and choose Add books to import the HTML file or the source content you prepared.
4. Select the book in Calibre and choose Convert books.
5. Set the output format to AZW3.
6. Review conversion settings such as page size, margins, and image handling. If the ebook is mostly visual, keep layout settings simple so the image displays clearly.
7. Click OK to start the conversion.
8. After conversion, use Save to disk or open the book in Calibre to verify the AZW3 output.

If you only have a BMP image and want a quick result, you can also convert it on the 101convert.com website for free without installing any software, then download the generated AZW3 file.

Notes on quality and limitations

BMP is a raster image format, while AZW3 is an ebook format, so this is not a direct image-to-image conversion. The BMP usually needs to be wrapped in ebook content, such as HTML, before it can become a valid AZW3 file. Because of that, the final result depends on how the image is embedded and formatted.

AZW3 works best for Kindle reading, but it is not as universally editable as standard document formats. Large BMP files can make the ebook heavy, and very high-resolution images may need resizing to display well on e-readers. Also, Kindle devices may handle complex layouts differently, so simple layouts usually produce the most reliable results.