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JPG vs JPEG: Understanding the Most Common Image File Format

Website owners come across image files regularly. Although you don't need to be an expert in image manipulation to edit and upload images on websites but you must be familiar with common file formats such as JPEG. Or is it JPG?

In this post, I'll show a JPG vs JPEG comparison to help you comprehend the differences as well as other details that will help you upload the best images you can to your website to provide the best user experience. If you're seeking an in-depth guide about the new .webp format is what you need, we've got your covered as well.

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

convert to jpeg

As a webmaster dealing with images, you've likely encountered the file format JPEG on occasion in the process of editing and uploading.

Did you know that the word JPEG could be actually used as a reference for three different things?

Then, we're here to discuss all of them:

1. JPEG Lossy Compression

When you upload images to your site It's essential to take care not to negatively affect the speed of your site and performance by uploading huge images that consume resources and take a long time when loading up on frontend of your website. In reality, all site administrators should optimize their websites by reducing the file sizes of their images while preserving speed of loading and user experience.

This is where JPEG comes in handy. JPEG is an lossy compression technique used to ensure that digital pictures used are as tiny as possible and load quickly when you want to access them.

Here are some points to keep in mind about lossy compression:

• The file size of the image compressed is always reduced by eliminating redundant ( redundant) informationfrom the image.
• Quality of the images is a concern in some cases, but the impact is usually so subtle that the average user won't be able to tell.
• During compression, each pixel of the compressed image is compared to other pixels by a ratio ranging from 2:1 in the range of 100 to 1 ( any pixels that exactly match the original are then removed as they are thought to be redundant).
• JPEG lossy compression is typically used for photographsand complicated still images.
• When you compress an image by lossy compression, you can determine your file's size as well as the image high-quality tradeoff ( e.g., smaller files = worse image quality).
• As much editing and saving one photo you make the less quality of the image will be.

If you're skilled in editing images using lossy compression, there's a chance you can save the image's quality while also reducing the size of the file through working with RAW JPEG images Editing them, and saving the image only once.

convert to bmp

If you're unable to carry out JPEG lossy compression on the images you upload to your website, there's always the alternative lossless compression.

The lossless compression method saves your images in an entirely new format ( usually PNG). The image quality cannot be diminished because no information is lost, it is important to know that using lossless compression, the final dimension of your photo will always be greater than that obtained with lossy compression. This could result in slower page loading times.

2. Joint Photographic Experts Group (JPEG)

JPEG is the acronym for the Joint Photographic Experts Group, which is the sub-committee which helped to create the JPEG standard along with other still picture coding standards belonging to the larger group called ISO.

The initial JPEG standard was published as of the year 1992. ISO ( International Organization for Standardization). ISO are responsible for preparing guidelines which "...provide requirements specifications, guidelines, or other characteristics that can be continuously used to assure that the materials, products, processes and services are appropriate to serve their purpose."

ISO sets the standards for various things that include digital images with the aim of providing users and consumers with the highest-quality products and solutions.

Image source: Wikimedia Commons

This is an international unofficial group of people that has members in 164 countries and is the world's largest developer of standards.

3. JPEG as a File Format

The last time the term JPEG can be used is when talking about a particular file format or as a method of storing pictures in digital format. This is probably how people are most familiar with JPEG because this is one of the formats for file alternatives you can use to save an image after editing it.

JPEG file format

Here are some interesting information regarding The .jpeg File format.

• Most commonly used image file format used by digital cameras as well as other imaging devices.
• Colors are supported by 16,777,216. They can be created using 8 bits of each RGB modeling of colors.
• It can display up to 16 million hues simultaneously and make the color scheme and contrast resolution close to perfect.
• Supports a maximum of 65,535 pixels x 65,535 pixels.
• This reduces the dimension of an image by 50-75 percent ( because of lossy compression) after saving

Additionally, this kind of file format isn't ideal for images with sharp edges as the colors blend together better than if the image was saved as .png, which display each individual pixel as a mix.

Let's now check out what JPG is.

What is JPG?

What in the world is JPG as compared to JPEG?

File extensions in Windows

It's true that when it comes to .jpeg and .jpg it's true that there's nothing different between themexcept the amount of characters.

Crazy right? Let us explain.

The term JPG is a result of the older version of Windows operating systems. Specifically, the MS DOS 8.3 and the FAT-16 system included a maximum limit of 3 letters for name of the file, in contrast to other operating systems that resembled UNIX such as Mac or Linux and Linux, which didn't have this limitation.

Also, on Mac as well as Linux systems images saved in JPEG format were saved with the extension .jpeg. However, when saving those same types of images on Windows and Windows 8, the file extension had to be reduced to .jpg to make sure it didn't exceed the limit of 3 letters.

Nowadays, Windows operating systems accept 3- and 4-letter file extensions like .jpeg as well as .jpg. But since so many people are using Windows for years, and are used to saving images in JPG format, they haven't stopped. As a result, programs for editing photos like Adobe Photoshop and GIMP save all JPEG images by default to the .jpg extension for the both Windows along with Macs to prevent confusion.

JPG vs JPEG: Similarities Between the Two

Okay, so you know the fact that .jpeg and .jpg images are the same exact thing. To drive that fact into your mind, and to help you to remember it for the future, we're going to explore the similarities between JPEG and JPG images.

1. Both Are Raster Images (Not Vector Images)

Computer images can be generated as vector or raster images. And since JPEGs , like other raster images, they are also JPGs.

The graphics in raster are bitmaps that are images. A bitmap is simply a grid of tiny pixels that when put together make an entire image. In another way, raster images are a collection of countless small squares ( or pixels) of color all coded in a certain shade or hue that when put together create a whole image that is logical to look at.

Image source: PrintCNX

Here's more information about raster images to make it easier to understand:

• Useful for non-lined images like photographs or scans of artwork or detailed graphics.
• They show subtle hue or shade gradations and very undefined lines and shapes.
• Due to their that they are pixel-based, they have quality issues when blown in dimensions ( they become jagged and reveal the individual pixels).
• They are defined and displayed in a specific resolution. The resolution is defined as dots per inch ( dpi).
• The more dpi you have, the higher the resolution and the visual appeal of the image.
• Common raster file formats include: TIFF, JPEG, GIF, PCX and BMP files.
• Raster images have become the Web standard, meaning that they are the preferred images that are found on the internet.

For the record, JPEGs or JPGs are not vector images.

Image source: PrintCNX

Here's some information regarding vector images, so you can understand the difference:

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• Images are based on mathematical formulas that define geometric shapes like polygons, lines as well as circles, curves and rectangles.
• Perfect for straight-edged photos like line art.
• Because there are no color gradients, they are great for flat and uniformly colored images.
• Include popular graphics such as logos, letterheads, as well as fonts.
• You can scale down or up without any loss in quality as they don't rely on pixels to make an image entire.

2. Both Terms Mean the Same Thing

Remember when we discussed the term JPEG and what it meant at the Joint Photographic Experts Group? You've probably guessed; JPEG and JPEG along with JPG are abbreviations for that identical ISO sub-committee.

3. Both Are Used for the Same Image Types

Because they are raster pictures rather than vectors neither .jpeg and .jpg formats are ideal when used to create digital photographs. Digital photographs contain extensive color gradations which look seamless when you save them as raster JPEG/JPG pictures. So, your visitors will always see a beautiful photo if the image is saved as a .jpeg/.jpg and uploaded to your site.

Find out more about image file types and the impact they have on your website.

4. Both Lose Some Quality When Saved

Since the .jpeg against .jpg comparison is not valid ( because they are exactly the same thing) This is reasonable to assume that the compression technique employed on both formats -- lossy compression-- will result in a decline in image quality when the size decreases.

Furthermore, this implies that no matter what file extension you are using ( either .jpeg or .jpg), your image's file size will be smaller than it was originally and result in faster loading speeds when uploaded to your website and the site's visitors view it.

In the end, JPEGand JPGs are both the same thing, and serve a few main purposes in order to reduce the size of files for better web browsing, and allow users to compress their images after saving. They can also name the file using a common extension that is recognized by many.

Ask yourself: JPG vs JPEG Which one is more superior? From there, don't think too hard because the answer is neither. Both are the same, and which one you pick is merely a matter of your preference.

JPG vs JPEG 2000

If you've been looking for information concerning JPEGs and other JPGs then you've likely seen the phrase JPEG 2000and was wondering what in the world it meant. Since it's an option for most photo editing programs.

JPEG 2000 was an image encoder created by the Joint Photographic Experts Group in 2000. It was developed to be better than the JPEG standard that was in place. Actually, it was created to enable lossless compression on Images made using modern compression techniques using a discrete wavelength transformation.

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It was a means for people to increase the quality of their images and save the images as JPEGs, without degrading the quality of the image.

Here are a few of the key features included in JPEG 2000:

• Advanced Compression Methodsunlike conventional JPEGs, JPEG 2000 could do lossy as well as lossless compression ( even on a single image file).
• Progressive Decoding:enables viewers to view smaller quality versions of an image even though the entire image is still being downloaded on the background. As more data is downloaded the quality of the image is improved for the user.
• Higher Compression Ratioswhen it is about lossy compression JPEG 2000 can compress images from 20 to 200 percent higher than JPEG, while maintaining the same quality of image when it is compared with an JPEG image similar in size.

Additionally, JPEG 2000:

• Helps preserve transparency in images.
• Can describe bi-level, grayscale as well as full-color image information.
• It can contain unlimited amounts of private or specific-purpose information in metadata.
• It can handle larger sizes of images ( greater than 64K x 64K pixels) and without tilting.
• Ultra-low latency, which is especially helpful to stream live TV.
• Scalability in both resolution and quality.

JPEG 2000 Limitations

Though JPEG 2000 comes with a wealth of wonderful features and may be the next-best coding standard for digital images however, there are some reasons it's still not an option for many people:

• No Universal browser compatibility ( only supports Safari).
• Uncompatible that works with JPEG ( must encode using a new standard) and supports the original JPEG).
• Coding JPEG 2000 files is CPU intensive, which can affect servers and slow things down.
• Some cameras and sites don't have the capability to recognize the format due to it not being widely accepted.

Because of its limitations, it's difficult to locate the JPEG 2000 file format as an option while saving your digital photos. And while it is arguably superior to JPEG, until it becomes widely accepted, you'll likely run across a myriad of compatibility problems, making your job as a webmaster more than it is.

Convert Image Files to JPG: Common Methods

There are many ways in which you could save your pictures in .jpg or .jpeg files. Let's take a look at several.

1. Windows Paint

If you're running Windows, you can easily save any image in .jpeg or .jpg by using Windows Paint. Upload your image into Windows Paint, go to Fileand then save as, choose the location of the file, then name your image, and select JPEG (*.jpg, *.jpeg, *.jpe, *.jfif)from the drop-down list.

Windows Paint

Click to save.

2. Affinity Designer

Affinity Designer is comparable to other image editing software such like Adobe Photoshop. To save an image as a JPG using a software like this, open the application and uploading your image. Make any adjustments you'd like and click Filethen Export.... After that, click an icon for JPEG, click the JPEG icon, select the quality ( best, high medium, or low), and select Export.

Affinity Designer

After that it, your When you do, the Save As dialog will pop up so you can choose a location, name the image, and again ensure that you save the file as JPG.

"Save as" in Affinity Designer

Click Save.

3. Online Converter Tool

If you're trying to convert images to JPG There are a number of free online tools that can assist. For instance, FileZigZag is a free online converter for files that is easy to use. Drag and drop your image file , or upload it and select the type of image for the image to be converted you, then type in your email address and click to convert.

Convert png into jpeg FileZigZag

Naturally, you'd not want to hand over your email to us in exchange for convert your image into JPG. That's why we've collected some other free and premium solutions to check out:

• XnConvert : perfect for advanced image editors that require lots of image files formats, the capability to batch convert, and the option to run Windows, Mac, or Linux.
• Zamzar :a free online tool for people who have high-quality photographs ( up to 50MB) and who need the option to have the final result sent to them electronically or not.
• The adapter : a simple image convertor that supports batch images. It converts images instantly and runs on both macOS and Windows.

Of of course, these are only one of the options for you to consider if are looking to convert images into JPG.JPG is different from JPEG What's the difference? What's the deal with JPEG 2000? Find out (and more) with our extensive guide! CLICK TO TWEET

Summary

JPG in contrast to JPEG are the most commonly used formats and methods of compression that allow users to save and save digital images. This is especially relevant for webmasters who want to display attractive images and ensure a great user experience.

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