JPEG is one of the most popular image formats used on the web today. Short for Joint Photographic Experts Group, JPEGs are widely recognized for their ability to compress image files while keeping a decent level of quality. Whether you're building a website, sharing a photo online, or creating a design, chances are you're using JPEGs in some way. Understanding how JPEGs work can help you make better decisions when it comes to visuals on your site or digital content.

How JPEG works in web design

JPEGs use a form of lossy compression, which means they reduce file size by permanently removing certain information from the image. This makes JPEGs ideal for web use because smaller image files load faster, improving site performance and user experience. Since JPEG compression is adjustable, designers can find a balance between image quality and file size depending on their needs.

JPEGs are especially helpful when you're adding photos or large images to a webpage. For example, an online store may use JPEGs to show off product photos without slowing down the page. It's important to note, however, that every time a JPEG is saved and compressed again, its quality decreases slightly.

Common uses for JPEGs on websites

JPEGs are everywhere across the web. They're often used for product images, banners, blog illustrations, and digital ads. Their small file size makes them perfect for responsive design, where loading speed and mobile optimization are key.

They're not great for everything, though. JPEGs don't support transparent backgrounds like PNGs do, and they aren’t ideal for images with sharp edges, like logos or line art. But when it comes to realistic photos with complex color gradients—JPEGs are hard to beat.

JPEG vs other image file types

When choosing an image format, it’s helpful to know how JPEGs compare to others like PNG, GIF, or WebP. JPEGs are best for photographic images where a little loss of quality is acceptable for faster loading times. PNGs, on the other hand, are better for sharp graphics or icons because they offer lossless compression.

GIFs are limited in color and mainly used for simple animations. WebP is a newer format that often provides better compression than JPEG but isn't yet supported everywhere. Still, JPEG remains a reliable go-to because of its broad compatibility and balance of quality and size.

How to optimize JPEGs for SEO and speed

Optimizing JPEGs is important for both SEO and performance. Search engines like fast-loading sites, and big images can slow down your page. To make the most of your JPEGs, use compression tools that reduce file size without a huge loss in quality.

Also, don’t forget to name your image files descriptively and add alt text—that helps search engines understand what the image is about. If you’re blogging or publishing content regularly, compressed JPEGs can keep your pages speedy and visually appealing.

Tips for using JPEGs in a website builder

If you're using a website builder like B12, uploading JPEGs is super simple. Most platforms will even suggest or apply basic optimization automatically. Still, it's a good idea to start with well-compressed images before uploading, especially if you're using a lot of photos on your site.

Remember, the goal is to deliver a visually rich experience without hurting your page speed. Keeping your JPEGs under control—file size-wise—helps visitors load your pages quickly and stay engaged.

FAQs about JPEG

What does JPEG stand for?

JPEG stands for Joint Photographic Experts Group, the name of the committee that created the format. It refers to a commonly used image format known for its balance of quality and compression. You’ll see it with file extensions like .jpg or .jpeg.

When should I use a JPEG image on my website?

Use JPEGs for photos, backgrounds, or any image with lots of colors and gradients. They’re ideal when you want a smaller file size without needing perfect quality. Avoid JPEGs for logos or graphics that need transparency or sharp edges.

Does using JPEG affect my website’s SEO?

Yes, indirectly. Large, uncompressed JPEGs can slow your site down, which hurts SEO. Optimized JPEGs help pages load faster, improve user experience, and can contribute to better search rankings when paired with good alt text.

What’s the difference between .jpg and .jpeg?

There is no difference between the two in terms of format or quality. The .jpg extension was originally used in older versions of Windows due to a three-letter file limit. Both are interchangeable today.

Can I edit JPEG images multiple times?

You can, but every time you save a JPEG after editing, it goes through compression again, which can lower its quality. If you plan to edit an image repeatedly, consider working with a lossless format like PNG or TIFF, then export as JPEG once you’re done.

Make your site faster and more visual with the right image formats

Choosing JPEGs wisely can give your site the perfect balance of image quality and performance. Whether you’re launching a blog, building an online portfolio, or refreshing your site design, smart image use makes a real difference. B12’s AI website builder helps you streamline image uploads and optimize your content from the start. Sign up to get started with a professional site built around smart design decisions.