SUN to RB conversion is the process of transforming images stored in the SUN raster format (commonly used for legacy SunOS/Solaris workstation graphics and raw bitmap data) into the RB format, a raster-based image container used by certain imaging tools and proprietary workflows. This conversion repacks pixel data, header metadata, and any palette information into RB's layout so the resulting file is compatible with RB-supporting software and preserves visual fidelity where possible.
Related guides
Practical guides to help you choose formats, preserve quality, and avoid common conversion problems.
Getting EPUB files onto your Kindle used to require mandatory conversion, but Amazon has gradually added native EPUB support through Send to Kindle. This guide covers every method for reading any eBook on your Kindle, from one-click email transfers to advanced Calibre workflows, plus metadata preservation, DRM considerations, and format selection between MOBI, AZW3, and KFX.
Read guide →A comprehensive guide to EPUB, MOBI, AZW, and PDF eBook formats. Compare features, device compatibility, DRM, file sizes, and learn which format is best for your reading device in 2026.
Read guide →Drag your .SUN file from your computer or use the browse function.
Confirm .rb as the selected destination format.
Click "Convert" and download your converted .RB file once ready.
SUN files use the application/x-sun-audio MIME type and are often encoded using PCM codecs for raw audio data. RB files typically use the audio/rb MIME type and support codecs optimized for compressed audio streaming. SUN is mainly used for archival purposes, whereas RB suits everyday audio playback and sharing.
The RB (.RB) format is commonly used for ebook. Understanding its characteristics can be helpful when converting to or from other formats like SUN.
While specific technical details aren't available here, RB files generally serve the purpose of storing ebook effectively within their domain.
Convert your SUN files to RB format instantly with our easy-to-use online converter. Designed for users who need a fast and reliable way to change file formats, our tool supports seamless conversion without compromising quality.
SUN files are typically raw audio recordings with large sizes and limited compatibility. RB format offers compressed audio optimized for streaming and playback on various platforms. While SUN maintains original quality, RB balances quality and file size effectively.
Keep individual SUN files under 250 MB for smooth browser-based conversion; larger files may require desktop tools or premium services.
To preserve quality, convert SUN 24-bit images to 24-bit RB and avoid color quantization unless file size is a priority.
For bulk workflows, batch convert groups of SUN files and output RB files into a compressed archive to simplify transfer and storage.
Note that SUN files with unusual or corrupted headers may fail to convert; validate headers or open in a viewer before conversion.
This SUN to RB converter saved me hours of work.
Emily R.
Musician
Fast and reliable conversion with excellent output quality.
Mark L.
Audio Engineer
Perfect for preparing audio files for my projects.
Lisa M.
Content Creator
Start your free SUN to RB conversion now.
Drag your file here to to upload.
Up to 250MB
If the SUN file uses a palette, ensure the converter maps the palette correctly to RB’s color table to avoid color shifts.