SUN to PGX conversion is the process of transforming image files in the SUN raster format (a simple, often uncompressed or RLE-compressed bitmap used in early Unix systems) into the PGX format (JPEG 2000 raw image coding format used for high-quality, lossless or lossy storage and progressive decoding). This conversion repackages pixel data, optionally applies compression or color-space adjustments, and produces a PGX file suitable for workflows that require JPEG 2000 tooling or progressive viewing.
Related guides
Practical guides to help you choose formats, preserve quality, and avoid common conversion problems.
WebP has quietly become the default image format of the modern web, delivering 25-35% smaller files than JPG and PNG with universal browser support. This 2026 guide covers current adoption stats, browser compatibility, WordPress integration, conversion workflows, and when to choose WebP over AVIF for optimal Core Web Vitals performance.
Read guide →Not sure whether to save your image as PNG or JPG? This detailed comparison covers compression, transparency, file size, web performance, and real-world use cases so you can pick the right format every time — with conversion links when you need to switch.
Read guide →Learn how to convert HEIC to JPG for maximum compatibility. This guide explains what HEIC is, why iPhones use it, the key differences between HEIC and JPG, and walks through every conversion method including online tools, iPhone settings, Windows, and Mac.
Read guide →Drag your .SUN file from your computer or use the browse function.
Confirm .pgx as the selected destination format.
Click "Convert" and download your converted .PGX file once ready.
SUN files use the image/x-sun-raster MIME type and are typically uncompressed raster images used in legacy Unix environments. PGX files have the image/x-pgx MIME type and use wavelet-based codecs for efficient compression. Both formats are used mainly in imaging workflows that require raster data, but PGX’s codec offers superior compression efficiency.
The PGX (.PGX) format is commonly used for image. Understanding its characteristics can be helpful when converting to or from other formats like SUN.
While specific technical details aren't available here, PGX files generally serve the purpose of storing image effectively within their domain.
Convert your SUN files to PGX format effortlessly using our online SUN to PGX converter. Designed for quick and accurate file conversion, our tool supports seamless transitions between these formats without compromising quality.
SUN is an older raster image format primarily used in Unix-based systems, while PGX is a more modern format optimized for compression and efficient storage. PGX supports higher compression rates without significant loss of quality, making it preferable for large image datasets. SUN files tend to be larger and less compatible with current software compared to PGX.
Keep SUN files under 250MB for smooth browser-based conversion; larger files may require desktop tools or a premium service.
To preserve maximum fidelity, convert SUN to PGX using lossless mode and match or exceed the input bit depth (e.g., convert 24/32-bit SUN to 16-bit PGX if supported).
For large batches, use a command-line or API-based converter that supports multiple-file queuing and preserves metadata to speed up processing.
Note format-specific limitations: SUN can include palette-based images that need palette expansion to full RGB for accurate PGX representation; transparent alpha channels in SUN may require special handling when creating PGX.
This tool made converting my SUN files to PGX effortless and fast.
Emily R.
Photographer
The conversion quality is excellent with no visible artifacts.
Jason L.
Software Developer
I appreciate how simple and reliable this online SUN converter is.
Mia S.
Graphic Designer
Start your free SUN to PGX conversion now.
Drag your file here to to upload.
Up to 250MB
If final use is web delivery, consider lossy PGX with lower bit depth or additional JPEG 2000 wrappers to reduce size while checking visual quality on representative samples.