JPEG to SUN Converter
FileFlip converts JPEG to SUN entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a JPEG file to SUN?#
- Drop your JPEG file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to SUN and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the SUN file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting JPEG to SUN lose quality?#
SUN is a lossless format, so nothing further is lost here, but nothing is recovered either. Whatever the JPEG encoder already threw away is gone, and the SUN file will usually be several times larger for exactly the same content.
Is it safe to convert JPEG files online?#
Yes, because nothing is uploaded. FileFlip converts JPEG files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What JPEG to SUN actually does to the file#
Converting JPEG to SUN runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, writes a lossless file that cannot recover what the source already discarded, and drops EXIF metadata and ICC colour profile.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: JPEG → SUN |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossless output, but nothing is recovered |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| EXIF metadata | Dropped | The target format has nowhere to put it. |
| ICC colour profile | Dropped | The target format has nowhere to put it. |
What is a JPEG file?#
.jpeg and .jpg are the same JPEG-compressed image format under two different extension spellings, a split that dates to the three-character extension limit of MS-DOS and early Windows.
Save an image as .jpeg over .jpg when a system, script, or personal convention specifically expects the full four-letter extension; the image data itself doesn't care which one is used.
Rename or export as .jpg instead of .jpeg when a target system, upload form, or older piece of software only recognizes the three-letter extension, which is the more common expectation today.
What is a SUN file?#
A SUN file is a Sun Raster bitmap, the same raw framebuffer image format Sun Microsystems shipped on SunOS workstations, saved under the alternate .sun extension some raster-image tools use in place of the identical .ras.
Recognise a .sun file as a Sun Raster image if it turns up alongside .ras files from the same legacy Solaris export or archive.
Convert SUN to PNG or TIFF for any modern use, since the .sun extension gets even less software recognition than .ras.
JPEG to SUN questions people ask#
What's the difference between .jpeg and .jpg?
There is no difference in the image data. Both extensions point to the same JPEG-compressed file format; the file's pixels, compression, and quality are identical either way, only the name on the extension changes.
Why does JPEG have two spellings of its extension?
MS-DOS and early Windows used the FAT filesystem's 8.3 naming rule, which limited every file extension to three characters, so the four-letter '.jpeg' wouldn't fit. Software on those systems saved files as '.jpg' instead, while Unix and early Macintosh systems, which had no such limit, kept the full '.jpeg' spelling the JPEG committee had used in its own 1992 documentation.
Why do people still use .jpg if the 8.3 limit is gone?
Windows removed the three-character extension limit in 1995 with long filename support in Windows 95, but by then .jpg was already the default on the world's most common desktop operating system. Habit, existing software defaults, and camera firmware kept it the more common spelling even after the technical reason for it disappeared.
Does renaming a .jpeg file to .jpg change anything?
No. Renaming the extension only changes the filename, not the bytes inside the file, so a .jpeg renamed to .jpg opens and displays exactly the same image. Any image viewer or editor that reads one extension reads the other.