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Difference between JPG and JPEG

Practically in all branches of work at the computer it is required to use images – web mastery, design, creation of presentations and other. And, certainly, all know and often meet a format of image Jpeg. However, sometimes in practice it is possible to see and pictures with similar format jpg. How is Jpg different from Jpeg? There seems to be a difference of only one letter, but are there differences in practice? You will find out about it in this article.

We find jpg and jpeg files everywhere, because these extensions belong to pictures and photos. We start to notice the differences when we need to approach a file formally rather than in a meaningful way: download, send, move or sort, in short, perform any action regardless of the content. As a rule, there are no problems with graphic files, because operating systems without shaman dances support viewing them in special programs. Live and rejoice without hesitation, but sometimes some software refuses to accept one or another format, or just an eye clinging to different extensions. 


JPGs are classified as raster image files and .jpg file format is realized for storing digital photos and images with 24-bit color support. This makes the JPG file format the default JPG standard for digital camera manufacturers and professional photographers. Since the compression specifications are integrated in the image content of these JPG files, its size is significantly reduced to optimal transferability. This means that users can easily share their digital photos to photos and store them in the .jpg format and upload them via the Internet or via email. Due to their small size, large collections of these JPG images can be stored in external data storage devices and optical media. Many third party applications are integrated into the feature set for editing these JPG images.


JPEG has become the standard format for compressing digital photos and sharing images online, thanks to a balanced file size and image quality. The exact ratio depends on the program and settings used, but a typical JPEG image has a compression ratio of 10:1. That is, if you start with a 10MB image and export it in JPEG format, you should get an image of approximately 1MB. JPEG has almost zero quality difference, although this depends on the content and file type of the original image.

For this purpose, JPEG uses discrete cosine transform (DCT). Although the mathematics behind it is complex, this compression algorithm looks through the entire image, determines which pixels in the image are sufficiently similar to those in the surrounding area, and combines them into tiles (groups of pixels with the same value). This method is extremely efficient, but it loses information that you can no longer recover. JPEG images have losses, which means that once you save an image, the lost data cannot be recovered. Thus, just like with photocopying, every time you open and save a JPEG, it will look a bit worse than before.

What makes Jpg different from Jpeg

In practice there are no differences when working with files of these formats. They are absolutely the same image formats. But why did two file extensions come from the same format? It is very simple. In the old operating systems, it was impossible to give a file extension a value with more than three characters. Because of this, the Jpeg extension has been reduced to Jpg. In newer versions of operating systems, an extension can contain both four and five characters, and even more. So it was decided to return the letter “e” to the pictures and in practice began to apply the variant of Jpeg. However, the tradition to write the format in the three-letter version is still there, so today in new operating systems you can still find the spelling of Jpg.

Today, the most common and used form is “.jpg”, as many users were Windows users. Image processing applications, such as Adobe Photoshop, save all JPEG files with the “.jpg” extension on both Mac and Windows to avoid confusion. The file format can also be saved with the “.JPEG” and “.JPG” file extensions in upper case, which are less common but also accepted. Images are sometimes found with different extensions – .jpg or .jpeg. What is the difference between them? Are they different image formats? Actually they are not – an image can be either image.jpeg or image.jpg. And it is the same image; and the image format is the same – JPEG. It’s just that before, when operating systems were old (like DOS), they supported an extension format – only three characters after the dot – .jpg. Now (under modern operating systems), this is irrelevant and the extension can be specified as officially called – .jpeg.This is the difference.

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