AZW3 to SUN Converter

Convert AZW3 to SUN Raster image — free online

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Kindle to SUN Raster

Render each AZW3 page as a SUN raster image — ideal for Unix workstations and legacy Solaris-based image processing.

Use From Any Device

The converter works in any modern browser — access it from your desktop, laptop, tablet, or phone to convert AZW3 to SUN.

Privacy Guaranteed

Your AZW3 ebook is erased from servers immediately after conversion, and SUN outputs are cleaned up within 24 hours.

How to convert AZW3 to SUN

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose sun or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your sun file right afterwards

About formats

AZW3, also known as Kindle Format 8 (KF8), is Amazon's advanced ebook format introduced in November 2011 alongside the first Kindle Fire tablet. It replaced the older MOBI-based AZW format with a substantially more capable layout engine built on HTML5 and CSS3 subsets, enabling fixed layouts, embedded fonts, SVG graphics, drop caps, and other typographic refinements that were impossible in earlier Kindle formats. Internally, an AZW3 file packages content in a structure derived from EPUB, wrapped in Amazon's proprietary Palm database container with optional DRM protection. The format supports both reflowable text for novels and fixed-layout pages for comics, cookbooks, and children's titles. One major advantage is rich formatting fidelity — publishers can produce visually sophisticated ebooks with complex page designs, nested tables, and precise font control that render consistently across the Kindle ecosystem. Another strength is backward compatibility: AZW3 files can bundle a MOBI fallback section so older Kindle hardware still displays the content, even without full KF8 rendering. The format integrates tightly with Amazon's Kindle platform, supporting features like X-Ray, Whispersync page tracking, and in-book dictionary lookups across millions of devices and apps worldwide.
Developer: Amazon
Initial release: November 2011
SUN is a raster image format associated with Sun Microsystems workstations, encompassing both the Sun Raster format (.ras) and the Sun Icon format used for window system icons and cursors on SunOS and Solaris systems. Sun Raster files, identifiable by their 0x59a66a95 magic number, store bitmap images in 1-bit monochrome, 8-bit indexed color, 24-bit BGR, or 32-bit XBGR modes, with optional run-length encoding compression and a 32-byte header. The Sun Icon subset is a simpler text-based format used for small monochrome bitmaps — window icons, cursor images, and toolbar graphics — stored as C-language data arrays that could be directly compiled into X Window and SunView applications. These icon files begin with a comment block specifying width, height, and optionally hot spot coordinates (for cursor images), followed by hexadecimal pixel values in a format readable by both the C compiler and the iconedit tool. Sun workstations running SunOS and later Solaris were foundational platforms for Unix computing, networking, and the early internet, and the SUN image formats were integral to their graphical environments. One advantage is the format's dual text/binary nature: Sun Icons are valid C source code that can be #included directly into applications, a practical approach to resource embedding that predates modern asset management systems. The Sun Raster variant's simplicity provides another strength — the 32-byte header and straightforward encoding make it one of the easiest binary image formats to parse. SUN format files are supported by ImageMagick, GIMP, XnView, and Unix image viewing tools.
Developer: Sun Microsystems
Initial release: 1982

Frequently Asked Questions

Why convert AZW3 to SUN?

SUN raster format is native to Solaris/SunOS environments — converting from AZW3 lets you bring Kindle content into Unix imaging tools.

What programs can open SUN files?

GIMP, ImageMagick, XnView, IrfanView, and most Unix-native image applications read SUN Raster images without issues.

Will text remain readable in SUN output?

Pages render at sufficient resolution for text to stay crisp and legible — each page becomes a separate SUN raster file.

How does SUN differ from RAS format?

They are essentially the same Sun Raster format — SUN and RAS are alternate file extensions used interchangeably in practice.

Is there a cost for AZW3 to SUN?

No cost at all. Convertio handles this conversion for free. Paid plans simply offer more bandwidth and batch features.