HEIF to SUN Converter

Convert HEIF images to SUN format online — fast and free

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Rapid Results

Most HEIF files convert to SUN in just seconds. High-performance cloud servers ensure quick turnaround even for large images.

Works Everywhere

No app downloads needed. The browser-based tool converts HEIF to SUN on Windows, Mac, Linux, iOS, and Android devices seamlessly.

One-Click Simplicity

No technical knowledge required. The converter guides you through HEIF to SUN conversion in a few clicks — upload, select format, download.

How to convert HEIF 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

HEIF (High Efficiency Image File Format) is a container format for images and image sequences standardized by the Moving Picture Experts Group as ISO/IEC 23008-12, first published in 2015. HEIF is built on the ISO Base Media File Format (ISOBMFF, the same container used for MP4 video), providing a flexible structure that can hold single images, image collections, image sequences (like animations or bursts), and derived images with non-destructive editing operations. The container is codec-agnostic — while the most common implementation pairs HEIF with HEVC/H.265 compression (branded as HEIC by Apple), the standard also accommodates AV1 compression (creating the AVIF variant), H.266/VVC, and other future codecs. HEIF supports features that JPEG lacks: 10-bit and 12-bit color depth, wide color gamuts (Display P3, BT.2020), lossless compression, alpha transparency, depth maps, thumbnail images, and Exif/XMP metadata — all within a single file. Auxiliary image items can store computational photography data like depth maps, HDR gain maps, and semantic segmentation masks. One advantage is the format's future-proof architecture: by separating the container from the codec, HEIF can adopt newer, more efficient compression technologies without changing the file structure, metadata handling, or application-level APIs. The substantial compression improvement over JPEG is another core strength — HEVC-based HEIF typically achieves 40-50% file size reduction compared to JPEG at the same visual quality, beneficial for storage and bandwidth. HEIF is supported by Apple's ecosystem (iOS, macOS), Windows 10/11, Android 10+, GIMP, ImageMagick, and Adobe products.
Initial release: 2015
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 HEIF to SUN?

HEIF offers superior compression but many platforms still can't open it — converting to SUN ensures your images display correctly everywhere.

How do I open a SUN file?

Compatible apps include IrfanView, XnView, GIMP, and Unix/Solaris desktop tools.

Does converting HEIF to SUN affect quality?

Your HEIF image data is processed carefully during conversion. The resulting SUN retains the maximum quality the target format can support.

How fast is the HEIF to SUN conversion?

Speed depends on file size, but most HEIF to SUN conversions complete in under a minute. Server-side processing ensures quick turnaround.

Can I convert multiple HEIF files to SUN at once?

Yes — upload several HEIF images at the same time and they will all be converted to SUN in a single batch for convenient download.

Is my HEIF file safe during conversion?

Your files are handled securely. The HEIF upload is erased right after processing, and the resulting SUN is purged from servers within 24 hours.