SUN Converter | FastConvert

How to convert files to SUN?

1

Upload your file

Click the 'Choose File' button or drag and drop your file into the upload area. Supported formats include PNG, JPG, WEBP and more.

2

Select the output format

Make sure SUN is selected as the conversion format. Adjust additional settings if needed.

3

Start the conversion process

Click the 'Convert' button and wait a few seconds. All conversions are performed on our servers.

4

Download the result

Once the process is complete, click the 'Download' button and save the file in SUN format.

Why choose our SUN converter?

We ensure quality, convenience, and support for all formats.

High-quality to SUN conversion

We guarantee precise to SUN file conversion without any loss of quality.

Support for multiple formats

You can convert your to SUN files from over 200 different formats, including images, documents, and more.

Compatible with all devices

Convert to SUN files from any device – whether it's a computer, tablet, or smartphone.

User-friendly interface

Our service is designed to make to SUN conversion easy for everyone in just a few simple steps.

Full data security

All files are transmitted and stored using advanced encryption technologies.

High-speed processing

Thanks to cloud technology, we ensure fast processing even for large to SUN files.

Convert to SUN: supported formats

Convert SUN to other formats

.SUN

SUN

Sun Raster (Sun Rasterfile / RAS)

Data type	Image
MIME type	image/x-sun-raster
Developer	Sun Microsystems
Primary use cases	Legacy SunOS/Solaris raster graphics; interchange/compatibility with older UNIX tooling; archived bitmap assets from Sun workstations

What is the SUN file format?

SUN (Sun Raster) is a legacy bitmap format from Sun Microsystems (SunOS/Solaris) with a simple header, optional palette, and pixel data stored uncompressed or with basic RLE.

SUN file characteristics

Data type	Image
MIME type	image/x-sun-raster
Compression	Optional lossless RLE
Color depth	Historically common depths are 1-bit (bitmap) and 8-bit (grayscale or paletted); many decoders also support 24-bit (color) and 32-bit (color with an extra byte used as padding/attributes rather than alpha)
Color space	Grayscale, indexed/paletted (with colormap), and RGB; some toolchains support 24/32-bit variants; transparency is not defined by the format
Transparency support	No
Animation support	No
EXIF / Metadata support	No
Metadata	Very limited. The header and optional colormap carry technical info; there is no standardized Exif/XMP container. Some software may store extra data via nonstandard conventions, but interoperability is not guaranteed.
Structure type	Header + optional colormap + pixel data (rows padded to 16-bit) with optional byte-RLE
Standard / Specification	SunOS rasterfile.h / rasterfile(5) (commonly referenced as rasterfile.h 1.11 dated 1989-08-21)
Typical file size	Often large because data is commonly uncompressed; RLE may reduce size for flat areas but not for photographic/noisy images
Year introduced	1989

Advantages

The SUN file format offers several advantages that make it suitable for common use cases.

Simple structure;
Lossless storage (raw or RLE);
Supports palette/grayscale/RGB;
Widely supported by conversion tools for legacy compatibility

Limitations

The SUN file format has certain limitations that may affect its use in specific scenarios.

Unofficial MIME types vary;
Many modern apps don’t open it natively. No standard transparency/alpha semantics, no layers, and limited metadata. Best used as a legacy interchange format—convert to PNG/WebP/AVIF for delivery.

Compatibility

SUN images are widely supported and can be viewed on most devices and platforms.

Supported platforms: Unix/Solaris heritage; today readable on Windows, macOS, Linux via tools/libraries (e.g., Netpbm, ImageMagick, GIMP, FFmpeg)
Supported devices: Legacy Unix workstations; modern computers via converters/viewers
Browser support: No
Mobile support: No
Backward compatibility: Yes

Security considerations

Treat as untrusted input: validate dimensions, row padding expectations, and RLE streams to avoid overflows/overreads in decoders

License

Legacy vendor format; specification is publicly documented (SunOS rasterfile.h / rasterfile(5)); not a formal modern standard

SUN usually refers to the Sun Raster (RAS) file format used on SunOS. Files commonly use the extensions .ras and .sun. The format starts with an 8×32-bit integer header (magic 0x59A66A95), followed by an optional color map, then raster lines stored top-to-bottom; each row is padded to a 16-bit boundary. Data may be uncompressed (RT_OLD/RT_STANDARD) or byte-RLE encoded (RT_BYTE_ENCODED). The format is publicly documented in Sun’s rasterfile.h / rasterfile(5), but it has no officially registered IANA MIME type—software often uses unofficial types like image/x-sun-raster or image/x-cmu-raster.

Convert to SUN online