The Battle of the Image Formats - Which image format should you use on your website?
The Battle of the Image Formats - Which image format should you use on your website?

Choosing the right image format for websites

Written by Daily Fix - Published 14-Apr-2024, last updated 21-Jun-2024

Images are key to engaging website visitors, but large file sizes can slow down image loading times. This quick guide explains the top image formats for websites, helping you strike the balance between quality and speed.

What is the best website image format?

A simple question, right? Well, the answer isn't that simple!

Images are the lifeblood of any engaging website. But with so many image formats available, choosing the right one can feel overwhelming. Fear not! This blog will delve into the world of website image formats, focusing on the titans: JPEG (.jpg) and PNG (.png), with a sneak peek at the rising star, WebP. We'll explore the top reasons to use each format, helping you strike the perfect balance between image quality and website speed.

The contenders - jpg, png and webp

There are three main image formats used on websites. Most people will have heard of jpg images (also known as jpeg, we will use references to jpg and jpeg interchangeably in this blog) - pronounced 'jay-peg', but png images are also common and there's growing use of a format called webp too.

  • JPEG images - The king of web images, JPEG/JPG excels at compressing photos with minimal quality loss.
  • PNG images - Known for its crisp details and ability to handle transparency, PNG is ideal for graphics and logos.
  • WEBP images - A newcomer gaining traction, WebP offers superior compression than JPEG images while maintaining similar quality. However, browser support is still evolving.

In the next part of this blog we will look at the 2 main website image formats and why/when you should use them.

Why use JPG images for your website?

Here are 5 reasons to use the JPG/JPEG format for your website images.

JPG produces smaller file sizes

One of the main reasons to choose JPEG images is that their file sizes are usually smaller than PNG files.

JPEG's magic lies in lossy compression, sacrificing some detail for a dramatic reduction in file size. This translates to faster loading times, crucial for a smooth user experience.

JPG is perfect for photos

JPG excels at preserving smooth colour gradients and variations found in photographs.

JPG is a universally supported image format

No matter the device or browser, JPEG is a safe bet for ensuring your images are displayed correctly.

JPG offers adjustable quality/compression

You control the compression level, finding the sweet spot between file size and acceptable quality loss.

JPG is widely used by cameras

Most digital cameras capture images in JPG format by default, making it a convenient choice.

Why use PNG images for your website?

5 reasons to use PNG as your website image format:

Lossless Compression

Unlike JPG images, PNG uses lossless compression, preserving every detail. This makes it ideal for graphics with sharp lines and solid colors, like logos and icons.

PNG is a transparency champion

Need an image with a transparent background? PNG is your hero, allowing seamless integration into your website design.

PNG excels at text clarity

For text-based graphics like charts and infographics, PNG ensures sharp edges and readability.

Animation potential

While not as common as GIF, PNG can also be used for simple animations.

There's wide browser support for PNG

Similar to JPEG, PNG enjoys broad browser compatibility.

Why use WEBP images for your website?

WebP is a promising format offering significantly smaller file sizes than JPEG with comparable quality. However, browser support is still catching up, so it's best used in conjunction with a fallback format like JPEG for wider reach.

At the moment we would stick with JPG and PNG formats for maximum browser support.

Choosing your optimal website image format

The optimal format for your website images depends on your image type and priorities. So in summary:

  • Photos: Use JPEG/JPG for its small file size and photo quality.
  • Graphics, logos and icons: PNG is your friend with its lossless compression and transparency options.
  • Experiment with WebP: If you're comfortable with some users potentially not seeing the image, try WebP for superior compression.

Remember, the key is to find the balance between image quality and website speed. By understanding the strengths and weaknesses of each format, you can make informed decisions to keep your website visually appealing and lightning fast!