Free online PNG to AZW3 converter

Source format: PNG

PNG (Portable Network Graphics) is a widely used raster image format known for lossless compression and support for transparency. It is commonly used by designers, photographers, publishers, and web developers for screenshots, illustrations, logos, and graphics that need crisp detail. A PNG file stores a single image, so when it is used in a document or ebook, it usually becomes part of a page layout rather than a standalone reading format.

Target format: AZW3

AZW3 is Amazon’s Kindle Format 8 ebook format. It is used primarily for ebooks intended for Kindle devices and Kindle apps. Compared with older Kindle formats, AZW3 supports more advanced layout features, better typography, embedded fonts, and richer formatting. It is best suited for books, manuals, and fixed or reflowable ebook content distributed through the Kindle ecosystem.

How to perform the conversion

Converting PNG to AZW3 is not a direct image-to-ebook format change in the usual sense. A PNG image must first be placed into an ebook container, typically as a single-image ebook or as part of a multi-page document. The most practical method is to create an ebook from the image and then save or convert it to AZW3.

1. Prepare the image. Make sure the PNG is high resolution and correctly cropped. If the image is a scanned page, consider cleaning it up first for better Kindle readability.
2. Use ebook creation software. The most reliable desktop tool for this task is Calibre. It can import images and convert them into Kindle-compatible ebook formats.
3. Add the PNG to Calibre. Open Calibre and choose Add books to import the PNG file. If needed, place the image into a simple HTML or EPUB wrapper first, since AZW3 is an ebook format rather than an image format.
4. Convert to AZW3. Select the imported item and choose Convert books. Set the output format to AZW3. In the conversion settings, you can adjust page size, margins, and image scaling.
5. Save the result. After conversion, Calibre will generate the AZW3 file, which can then be transferred to a Kindle device or opened in Kindle-compatible software.

If you prefer a simpler workflow for a single image, you can also create a basic HTML page containing the PNG and then convert that HTML file to AZW3 in Calibre. For example, an HTML file can reference the image with <img src="image.png">, and then the HTML can be converted to Kindle format.

You can also convert the file on 101convert.com for free, without installing any software, if the site offers this conversion in its built-in online converter.

Notes on quality and limitations

PNG to AZW3 is not a native one-step conversion because AZW3 is designed for ebooks, not standalone images. The final result depends on how the image is wrapped into the ebook structure. If the PNG is large, the AZW3 file may preserve it well, but Kindle devices may downscale or reflow content depending on settings and screen size.

For scanned pages or comics, AZW3 can work, but it is often less ideal than formats specifically designed for fixed-layout reading. Text inside the image will not be searchable or selectable unless OCR is applied before conversion. Also, very detailed or oversized PNGs may increase file size and slow down rendering on older Kindle devices.

If your goal is simply to read an image on Kindle, AZW3 can be a workable container. If your goal is to preserve exact page appearance, test the output on the target Kindle model, because layout behavior can vary between devices and apps.