Website owners encounter image files all the time. While you don’t have to be an image expert to edit and upload images to a website, you should familiarize yourself with common file formats such as JPEG. Or is it JPG?

In this article, I’ll present a JPG vs JPEG showdown so you understand the differences, as well as other details that will help you upload the best images possible to your website for the ultimate user experience.

Ready? Let’s get started!

What is JPEG?

As a website owner working with images, you have most likely seen the file format JPEG at some point during your editing and uploading adventures.

But did you know that the term JPEG is actually a reference for three different things?

Well, it is and we’re here to explain all of them:

1. JPEG Lossy Compression

When you upload images to your website, it’s important you take care not to negatively affect your site’s speed and performance by using large images that waste resources and take forever to load on the frontend of your site. In fact, all website owners should optimize their images in some way to reduce the file sizes of their images and preserve loading times and the user experience.

That’s where JPEG comes in handy. JPEG is a lossy compression method used to ensure the digital images being used are as small as possible and load quickly when someone wants to view them.

Here are some things to remember about lossy compression:

If you’re more experienced in editing images using lossy compression, there is a chance you can save the image quality while reducing its file size by working with RAW JPEG images, making edits, and saving the image one time.

If you don’t want to perform JPEG lossy compression on your site’s images, there’s always the alternative: lossless compression.

Lossless compression saves your images in an entirely different format (usually PNG). While the image quality is never sacrificed because no information is eliminated, know that with lossless compression the final file size of your image will always be bigger than with lossy compression. This may result in slower page loading times.

2. Joint Photographic Experts Group (JPEG)

JPEG stands for the Joint Photographic Experts Group, which is the name of the sub-committee that helped create the JPEG standard, as well as other still picture coding standards under the broader group called ISO.

The first JPEG standard was issued in 1992 by ISO (International Organization for Standardization). ISO is responsible for creating documents that “…provide requirements, specifications, guidelines or characteristics that can be used consistently to ensure that materials, products, processes, and services are fit for their purpose.”

ISO sets the standards for many things, including digital images, in an effort to provide users and consumers with the highest quality products and services.

ISO logo

Image source: Wikimedia Commons

This international organization is a voluntary group of people with members from over 164 countries, making it the world’s largest developer of standards.

3. JPEG as a File Format

The last way the term JPEG is used is when referencing a file format name or a way to store and save digital images. This is probably the way you’re most used to seeing JPEG because this is one of the file format choices you have when you save an image after editing it.

jpg vs jpeg: jpeg file format

JPEG file format

Here are some fun facts about the .jpeg file format:

Lastly, this type of file format is not ideal for images with sharp edges because the colors blend together more than if it were saved as a .png, which display individual pixels as a combination.

So, now let’s check out what JPG is.

What is JPG?

What in the world is JPG in comparison to JPEG?

jpg vs jpeg: windows file extensions

File extensions in Windows

Well, when it comes to .jpeg vs .jpg, the truth is there is no difference between the two except the number of characters.

Crazy right? Let us explain.

The term JPG exists because the earlier versions of Windows operating systems. Specifically, the MS-DOS 8.3 and FAT-16 file systems had a maximum 3-letter limit when it came to file names, unlike the UNIX-like operating systems like Mac or Linux, which didn’t have this limit.

So, on Mac or Linux systems, images saved as JPEGs used the file extension .jpeg. But when it came to saving those same types of images using Windows, the file extension had to be shortened to .jpg so it didn’t exceed the 3-letter limit.

Nowadays, Windows operating systems accept 3- or 4-letter file extensions such as .jpeg or .jpg. But since so many people have been using Windows for so long, and are used to saving their images as JPGs, they haven’t stopped. Because of this, photo editing software such as Adobe Photoshop and GIMP save all JPEG images by default to the .jpg file extension on both Windows and Macs to avoid confusion.

JPG vs JPEG: Similarities Between the Two

Okay, so you know that .jpeg and .jpg files are the same exact thing. But just to drive that point home, and help you remember it long into the future, we’re going to look at the similarities of JPEG and JPG images.

1. Both Are Raster Images (Not Vector Images)

Computer images can be created as raster or vector images. And since JPEGs are raster images, so are JPGs.

Raster graphics are bitmaps of images. A bitmap is a grid of individual pixels that when combined create an entire image. In other words, raster images are a collection of countless tiny squares (or pixels) of color that are each coded in a specific hue or shade that when put together create a whole image that makes sense to look at.

jpg vs jpeg: raster image example

Image source: PrintCNX

Here’s more information about raster images to help you better understand:

Again, JPEGs and JPGs are not vector images.

jpg vs jpeg: vector image example

Image source: PrintCNX

Here’s some information about vector images so you can understand the difference:

2. Both Terms Mean the Same Thing

Remember when we discussed the term JPEG and how it stood for the Joint Photographic Experts Group? Well, you guessed it; both JPEG and JPG are abbreviations for that same ISO sub-committee.

3. Both Are Used for the Same Image Types

Because they are raster images, and not vectors, both .jpeg and .jpg file formats are best used for digital photography. Digital photographs have extensive color gradations that appear seamless when saved as raster JPEG/JPG images. This means your site visitors will always see a beautiful photograph if it’s saved as a .jpeg/.jpg and uploaded to your website.

Learn more about image file types and their impact on your website.

4. Both Lose Some Quality When Saved

Since the .jpeg vs .jpg comparison is null (because they are the same exact thing), it makes sense that the compression method used on each file format — lossy compression— results in some loss of image quality as the file size of the image decreases.

In addition, this means that no matter what file extension you use (either .jpeg or .jpg), your image’s file size will be smaller than it was originally and result in faster loading times when uploaded onto your website and viewed by site visitors.

In the end, JPEGs and JPGs are the same thing and serve a few main purposes: to reduce the file size of images for better web viewing and give people an easy way to compress their images upon saving and name the file using a common file extension that is recognized by many.

So ask yourself: JPG vs JPEG, which is better? From there, don’t think too hard because the answer is neither. They are the same and whichever one you choose, is just a matter of preference.

JPG vs JPEG 2000

If you’ve ever found yourself searching for information about JPEGs and JPGs, you may have come across the term JPEG 2000 and wondered what in the world that was. After all, that’s not an option in most image editing software.

JPEG 2000 was an image encoding system created by the Joint Photographic Experts Group in 2000 that was designed to be better than the JPEG standard already in place. In fact, it was designed to implement lossless compression on images using advanced compression techniques on a discrete wavelength transformation.

It offered people a way to optimize their images and save them as JPEGs, without degrading the quality of the image.

If you’re uploading plenty of photos and images on your site, you don’t want to serve slow pages to your visitors right? We provide blazing fast servers and 24/7 world-class support from WordPress experts. Check out our plans

Here are some of the most important features of JPEG 2000:

In addition, JPEG 2000:

JPEG 2000 Limitations

Though JPEG 2000 has plenty of great features and seems to be the next best coding standard for digital images, there are reasons why it is still not a popular file format for most people:

Because of its limitations, you’ll be hard-pressed to find the JPEG 2000 file format as an option while saving your digital images. And while it is arguably better than JPEG, until it is universally accepted, you’ll likely run into a bunch of compatibility issues making your job harder as a website owner than it needs to be.

Convert Image Files to JPG: Common Methods

There are plenty of ways to save your digital images as .jpg or .jpeg files. Let’s take a look at a few.

1. Windows Paint

If you have Windows, you can easily save any image as a .jpeg or .jpg using Windows Paint. Just upload your image to Windows Paint, go to File > Save as, choose the file destination, name your image, and select JPEG (*.jpg, *.jpeg, *.jpe, *.jfif) from the dropdown menu.

Windows Paint

Windows Paint

Then click Save.

2. Affinity Designer

Affinity Designer is much like other image editing software such as Adobe Photoshop. To save an image as a JPG using a software like this, start by opening the application and uploading your image. Make any edits you want and click File > Export…. Then, select the JPEG icon, choose the quality (best, high, medium, or low), and click Export.

export affinity designer

Affinity Designer

When you do, the Save As dialog will open so you can choose a file destination, name your image, and again ensure that you are saving the file as a JPG.

save as affinity designer

“Save as” in Affinity Designer

Click Save.

3. Online Converter Tool

If you want to convert images to JPG, there are many free online jpg converter tools to help. For example, FileZigZag is a free online file converter that’s simple to use. Just drag and drop your image file or upload it, choose the file type to convert the image into, enter an email address, and click Convert.

convert png to jpeg filezigzag

Convert png to jpeg FileZigZag

Of course, you may not want to hand over your email in exchange for converting your image into a JPG. That’s why we’ve rounded up some other free and premium solutions for you to check out:

Of course, these are just some of the available options you have if you want to convert images to JPG.

JPG vs JPEG: What's the difference? What about JPEG 2000? 😫 Get the answer (and more) in our extensive guide! 💪Click to Tweet

Summary

JPG vs JPEG are the most common file extensions and compression methods for those wanting to store and save digital images. This is especially true for website owners that want to display visually appealing imagery and maintain an exceptional user experience.

Luckily for you, no matter whether you prefer .jpeg or .jpg file types, you’re going to get the same outcome: beautiful images that load blazing fast for site visitors.


If you enjoyed this article, then you’ll love Kinsta’s WordPress hosting platform. Turbocharge your website and get 24/7 support from our veteran WordPress team. Our Google Cloud powered infrastructure focuses on auto-scaling, performance, and security. Let us show you the Kinsta difference! Check out our plans