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JPG vs JPEG: Understanding the Most Common Image File Format

Webmasters encounter images every day. Although you don't need to be an expert on image files to edit and upload images to a website however, it is essential to be familiar with standard file formats such as JPEG. Or is it JPG?

In this article, we'll discuss a JPG as well as a JPEG comparison to help you comprehend the difference, as well as other details that will enable you to upload the finest images to your website for the ultimate user experience. If you're seeking more in-depth information on the current .webp file format, we've got you covered too.

Ready? Let's get started!

Table of Contents

1. What is JPEG?
2. What is JPG?
3. JPG vs JPEG: Similarities Between the Two
4. JPG vs JPEG 2000
5. Convert Image Files to JPG: Common Methods

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As a webmaster dealing with images, you have probably encountered this file type JPEG at some point during your uploading and editing adventures.

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

Yes, it's so and we're here in order to clarify all of them:

1. JPEG Lossy Compression

When you upload images to your website be sure to ensure you don't impact your website's speed or performance by using big images that consume a lot of resources and take forever in loading on the front end of your site. In reality, all site owners must optimize their images by reducing the size of their pictures and maintain loading times and the user experience.

That's the reason why JPEG is helpful. JPEG is a lossy compression tool used to ensure that digital pictures that are used are as small as they can get and load swiftly when someone wants to view them.

Here are some important things to be aware of about lossy compress:

• The size of the image being compressed is reduced permanently by eliminating unnecessary ( redundant) informationfrom the image.
• Quality of the images is a concern, though it's often minimal that a typical site visitors aren't able tell.
• In the compression process, each pixel of the compressed image is compared to other pixels with a ratio that ranges from 2:1 all the way in the range of 100 to 1 ( any pixels that are similar to the original ones are removed since they are deemed unneeded).
• JPEG lossy compression is commonly utilized for photographsand more complex still images.
• The moment you compress an image with lossy compression, you determine how big the file is and what picture quality. ( e.g., smaller files equals lower image quality).
• The more editing and saving of one image you edit the lower the quality of the image will be.

If you're more experienced in editing images using lossy compression, there is an opportunity to improve the image quality while reducing its size. This is done using RAW JPEG images Editing them, and saving the image once.

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If you're not sure whether you want to use JPEG lossy compression of the images on your site there's an alternative: lossless compression.

The lossless compression method saves your images in a totally new format ( usually PNG). While the quality of the image is never compromised as there is no information can be removed, you should know that even with lossless compression, the final dimensions of the image you upload will always be greater than when using lossy compression. This could result in the loading time of your site to be slower.

2. Joint Photographic Experts Group (JPEG)

JPEG refers to the Joint Photographic Experts Group, which is the name given to this sub-committee, which was instrumental in the development of the JPEG standard as well as the other still picture coding standards within the larger group of ISO.

The initial JPEG standard was issued around 1992, by ISO ( International Organization for Standardization). ISO has the responsibility of creating standards with the intention to "...provide requirements specifications, guidelines, or other attributes that can be followed consistently to ensure that the products, materials processes and processes are suitable for purpose."

ISO sets standards for many things including digital imagery, in the hope of providing customers and clients with best quality products and services.

Image source: Wikimedia Commons

This international group is a non-profit group of members from more than 164 countries which makes it the world's biggest developer of standards.

3. JPEG as a File Format

The last time the term JPEG is utilized is when it refers to a name for a file format or a method for storing pictures in digital format. This is likely the way people are most familiar with JPEG because it's one of the formats for file options you can choose to use when you take a picture after making changes to it.

JPEG file format

Here are some fun facts regarding the .jpeg File format.

• Most common image file form used by digital camera and other image capturing devices.
• Supports 16,777 colors. are produced by using 8 bits of each in the RGB modeling of colors.
• Can display an impressive 16 million colors at once and make the colors and the contrast nearly perfect.
• Supports a maximum of 65.535 x 65.535 pixels.
• Reducing the size an image by about 50-75% ( because of lossy compression) when saved

Lastly, this type of file format may not be suitable for images with sharp edges since the colors mix more than if they were saved as .png format, which displays individual pixels as a combination.

So, let's find out what JPG is.

What is JPG?

What is JPG when compared the other formats, JPG and JPEG?

Extensions for files in Windows

When it comes to .jpeg as opposed to .jpg it's true that there's not a difference between themexcept the number of characters.

Crazy right? Let us explain.

The term JPG is a result of the older version of Windows operating systems. In particular, the MS-DOS 8.3 as well as the FAT-16 system had a maximum 3-letter limit for names of files, unlike more UNIX-like operating systems, like Mac or Linux that didn't have this limitation.

On Mac as well as Linux systems the images saved using JPEGs included the file extension .jpeg. But when it came to saving the same type of images with Windows, the file extension was required to be reduced to .jpg to make sure it didn't exceed the limit of 3 letters.

Nowadays, Windows operating systems accept the 3- or 4-letter file extensions like .jpeg and .jpg. But since so many people use Windows for a long time, and are accustomed to save their images as JPGs but they've not stopped. Due to this, the photo editing programs like Adobe Photoshop and GIMP save all JPEG images automatically to the .jpg extension for files on all platforms, including Windows or Macs to prevent confusion.

JPG vs JPEG: Similarities Between the Two

Okay, so you know there's a difference between .jpeg and .jpg files are basically the similar thing. To drive that point home, and make sure you keep it in mind for the future, let's review the similarities between JPEG or JPG images.

1. Both Are Raster Images (Not Vector Images)

Computer images can be made by raster images or vector images. And since JPEGs are raster images, so are JPGs.

Bitmaps are graphic representations of images. A bitmap is a pattern of individual pixels that when combined make an entire image. In other words, raster images are a collection of countless tiny squares ( or pixels) of color that are each encoded with a particular hue or shade . These when taken together form an image that is clear to look at.

Image source: PrintCNX

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

• It is ideal for non-lined pictures such as photographs, scanned artwork, or even detailed graphics.
• They show subtle hue or shade variations, and are very vague lines and forms.
• Due to their pixels-based nature, they face quality issues when blown up in dimensions ( they become jagged and expose the individual pixels).
• They are identified and displayed with a specific resolution. This resolution is calculated in dots per inches ( dpi).
• The higher the dpi, the more resolution and aesthetic appeal of the image.
• Common raster file format options include: TIFF, JPEG, GIF, PCX and BMP files.
• Images in the Raster format are standard on the Web standard, meaning they are the preferred images you can find on the internet.

Again, JPEGs and JPGs are not vector images.

Image source: PrintCNX

Here's some information about vector images to ensure you'll be able to distinguish between the two:

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• Images are based on mathematical formulas that define geometric shapes like polygons, lines and curves, circles and rectangles.
• Perfect for straight-edged photos like line art.
• Since there aren't any color gradations, they work well for flat and uniformly colored images.
• Include popular graphic elements such as logos, letterhead, and fonts.
• The ability to scale up and down is not accompanied by any quality loss because they don't depend on pixels to make the image total.

2. Both Terms Mean the Same Thing

Remember when we discussed the word JPEG and what it meant in reference to the Joint Photographic Experts Group? Yes, you read it; they both JPEG and JPG are abbreviations for that identical ISO sub-committee.

3. Both Are Used for the Same Image Types

Because they're raster images that are not vectors, both .jpeg and .jpg file formats are best used for digital photography. Digital photographs have extensive color gradations which look seamless when saved as raster JPEG or JPG images. So, your visitors will always see a beautiful image when it's saved to an .jpeg/.jpg upload to your website.

Find out more about image file types and how they impact your website.

4. Both Lose Some Quality When Saved

Since the .jpeg against .jpg comparison is null ( because they are exactly the same thing) This makes sense that the compression technique employed on both file formats -- lossy compression-- causes a loss in image quality as the file size of the image decreases.

In addition, this means that regardless of what extension you choose to use ( either .jpeg or .jpg), your image's file size will be smaller than what it was before and will result in faster loading times when uploaded on your website and people visiting your website.

In the end, JPEGand JPGs are the same and serve a variety of primary functions which include reducing the file size of images for better web viewing and allow users to compress their pictures after saving and name the file using a common extension that is recognized by a large number of.

Consider: JPG vs JPEG which one is superior? From there, don't think too hard because there is no difference. Both are the same, and the choice of which you decide to use is only a matter your preference.

JPG vs JPEG 2000

If you've ever found yourself searching for information regarding JPEGs or JPGs, it's possible that you've come across the term JPEG 2000and wondered what in the world it meant. It's not an option for most picture editing tools.

JPEG 2000 was an image encoder created by the Joint Photographic Experts Group in 2000. The JPEG 2000 standard was designed to be better than the JPEG standard already in place. Actually, it was developed to provide lossless compression of Images with the use of advanced compression techniques that use a discrete wavelength transformation.

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It provided people with a method to increase the quality of their images and save them in JPEGs, without degrading the quality of the image.

Here are a few of the key features from JPEG 2000:

• Innovative Compression Technologies:unlike traditional JPEGs, JPEG 2000 could provide lossless and lossy compression ( even on a single image file).
• Progressive Decoding:enables site visitors to see the lower quality version of an image while the entire thing is still downloading as background. As more data downloads, you can see the image's quality increase for the viewer.
• Higher Compression Ratioswhen it comes to lossy compression, JPEG 2000 can compress images from 20 to 200% more than JPEG and maintain the same image quality it is compared with a JPEG image of the same size.

Additionally, JPEG 2000:

• Provides preservation of transparency in images.
• It can describe grayscale, bi-level, palette-color, and full-color image information.
• It can contain unlimited amounts of private or specific-purpose information within metadata.
• Larger image sizes can be handled ( greater than 64K pixels), with no tilting.
• Ultra-low latency can be particularly beneficial in live TV programming.
• Scalability of resolution as well as quality.

JPEG 2000 Limitations

Although JPEG 2000 contains a number of fantastic features and could be the next most efficient coding standard for digital images However, there are reasons it is still not one of the file formats that is popular with the majority of people:

• There is no Universal browser compatibility ( only supports Safari).
• Non-compatibility not compatible with JPEG ( must encode using a new standard) and supports original JPEG).
• Coding JPEG 2000 files can be CPU intensive, which can make servers overloaded and cause them to slow down.
• Many cameras and websites aren't ready for the format due to it not being widely accepted.

Because of its limitations, it's hard to find that JPEG 2000 file format as an option when saving your digital photos. While it's superior to JPEG, until it is universally accepted as a standard, you'll likely bump through a lot of compatibility issues , making your life more difficult as a webmaster that it really needs to be.

Convert Image Files to JPG: Common Methods

There are plenty of ways that you can save digital images as .jpg and .jpeg files. Let's take a look at some.

1. Windows Paint

If you have Windows You can effortlessly save any image to .jpeg or .jpg by using Windows Paint. Simply upload your image to Windows Paint, go to the File menu, selectoption > Save As, choose the file destination, name your image, then choose JPEG (*.jpg, *.jpeg, *.jpe, *.jfif)from the dropdown option.

Windows Paint

Then click to save.

2. Affinity Designer

Affinity Designer is comparable to other image-editing software such like Adobe Photoshop. To save images as a JPG using a tool like Affinity Designer, first start by opening the application and then uploading your image. Make any edits you want and click "Fileand then export.... Next, click on your JPEG icon, choose the quality ( best, high, medium, or low) then select to export.

Affinity Designer

If you do this you do, you will see the When you do, the Save As dialog will pop up so you can select a destination, name your image, and confirm that you are saving the file as a JPG.

"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 converters that can help. For instance, FileZigZag is a free online converter for files that is easy to use. Just drag and drop the image file or upload it, choose the file type for conversion and then enter an email address and click to convert.

Convert png file to jpeg FileZigZag

Of courseyou'll not be willing to divulge your email in exchange for making your image a JPG. That's the reason we've gathered several other premium and free solutions that you can check out:

• XnConvert : perfect for advanced image editors that require a variety of image file formats, the ability to bulk convert, and also use Windows, Mac, or Linux.
• Zamzar :a free online tool for people who have huge images ( up to 50MB) that want the option of having the final output emailed or not.
• The adapter : a simple image converter , which can work with batch images. It also converts them quickly and works with macOS as well as Windows.

Of obviously, these are some of the options available to you if need to convert your images to JPG.JPG is different from JPEG What is the difference? What's with JPEG 2000? Find the answer (and more) in our extensive guide! CLICK TO TWEET

Summary

JPG Vs JPEG are among the most used formats and methods of compression for people wanting to store files and backup digital photographs. This is especially relevant for webmasters that wish to showcase visually appealing images and provide a superior user experience.

Luckily for you, no whatever you'd prefer .jpeg, .jpg or .webp kinds of files, you'll be able to achieve the same result: beautiful images that are loaded extremely quickly for site users.

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