CRW to SUN Converter

Quick CRW to SUN — convert your images online for free

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Intuitive Design

The conversion interface is clean and intuitive — just three steps from CRW upload to SUN download. No learning curve, no complicated menus.

Reliable Engine

Millions of users trust Convertio for CRW to SUN conversion — a reliable, well-tested tool that delivers consistent results every time.

Image Integrity

Your CRW photos deserve clean output. The conversion engine produces SUN files that maintain the visual character and detail of the source image.

How to convert CRW 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

CRW is Canon's first-generation RAW image format, based on the Camera Image File Format (CIFF) specification developed jointly by Canon, Kodak, and other imaging companies in the late 1990s. Used by Canon's consumer and prosumer cameras from approximately 1998 through the early 2000s — including the PowerShot G-series, EOS D30, EOS D60, and EOS 10D — CRW files store the unprocessed 12-bit sensor readout in a heap-based container structure that differs fundamentally from the TIFF-derived approach used by most other camera manufacturers. The CIFF container organizes data into a hierarchical directory of heap entries, each identified by type and tag, containing the raw image data, JPEG thumbnail, EXIF information, and Canon's proprietary metadata including White Balance tables and Picture Style parameters. CRW was eventually replaced by the CR2 format starting with the EOS-1D Mark II in 2004, as Canon moved to a TIFF-based container that aligned more closely with industry conventions and supported higher bit depths. One advantage of CRW files is historical completeness: they preserve the full original sensor data from an important transitional period in digital photography, and the 12-bit captures from cameras like the EOS D30 still produce excellent results when reprocessed with modern RAW converters. Broad legacy support is another strength — despite its age, CRW remains readable by Adobe Lightroom, Photoshop, RawTherapee, and other modern converters, ensuring these early digital negatives remain accessible.
Developer: Canon
Initial release: 1998
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 would I convert CRW to SUN?

CRW files from vintage Canon cameras use the outdated CIFF container — converting to SUN ensures continued access as fewer applications handle CRW natively.

Which apps support SUN?

SUN files can be opened with IrfanView, XnView, GIMP, and Unix/Solaris desktop tools.

How fast is the CRW to SUN conversion?

Conversion typically takes just a few seconds — CRW images are processed on powerful servers and the SUN output is ready almost immediately.

Is my CRW file safe during conversion?

Convertio prioritizes privacy — your CRW file is deleted after conversion completes, and the SUN result is automatically removed within 24 hours.

Is CRW to SUN conversion free?

Converting CRW to SUN is free at Convertio. For heavier workloads or extra features, paid plans provide additional capacity.

Does the converter work on all devices?

Yes — the CRW to SUN converter runs entirely in your browser. It works on Windows, macOS, Linux, tablets, and smartphones with no software installs.