What Is It and How It Can Improve Website Performance

 It is loaded in continuous waves until a clear picture is formed. This can improve website performance because images are loading faster.

Difference between 

Baseline JPEG and Progressive JPEG Baseline JPEG and Progressive JPEG compress it differently and display images – especially if you have a slow Internet connection

The standard JPEG format loads images from top to bottom in a row at a time, and each line is already pixel perfect. Therefore, it may take some time to fully load the image.

Baseline JPEG Loading Process

For progressive JPEGs, the image appears as a whole at once, but will be blurred and pixelated at first. Gradually, you will see a clear and fully filled image.

Benefits of Progressive JPEG On 

a website, Progressive JPEG can improve the user experience. Although blurred, visitors can see the entire image at first glance. In addition, generally being smaller in size, progressive JPEG can also reduce bandwidth and resource usage such as disk space – helping your website load faster.

But if you use an older version of Internet Explorer (before Windows 7), be sure to install the latest update to enable the feature.

Step 1: Analyze JPEG Images 

To enter the website URL box, paste the URL of your site and press Start Test. 
Webtest.org homepage for page analysis 
Once the test run is complete, go to the test results page, then choose the Performance Review tab. Scroll down, unless you use progressive JPEG. 
Results will show “failed” for the baseline JPEG images shown below: 
Webtest.org results for progressive JPEG

Then you have to convert them to progressive JPEG.

free software and tools that can work. Our recommendations are:

addition to converting basic JPEG images to optimizilla progressive ones, you can also reduce the image size with this tool. It uses lossy compression techniques. Completely go to Optimizilla and upload your image – 20 images in one session. You can then set the image quality before downloading, but be sure to keep it at 85 or above for better quality. 
For the Optimizeilla interface image compressionon process, your image will be progressive and small in size. 


RIOT is a free software that has many features for image optimization. By creating progressive images, adjusting colors, and adding metadata information, everything can be done through its simple interface. You can also convert your image to three different formats – JPEG, GIF, and PNG. What’s more, you can see the changes directly. However, keep in mind that this tool is only available for Windows. 

Step 3: Replace Old Images 

After converting, you will need to update the images within your site. You can access your hosting file manager or use an FTP client to locate existing baseline images. Extract and replace them with progressive JPEG images.

To avoid technical issues, make sure to use the same file name for each image. Now, test your website again using WebPageTest. If you do the process correctly, you will not get any basic JPEG images in the display results.


If you want images to load faster on your website, it is better to convert them to progressive JPEG format. It works by loading images in continuous waves. You will see a blurred or pixelated picture for the first time, but it will not be clear.

To see if your website has basic JPEG images, you can use the WebPageTest tool. If this happens, you can convert them to progressive format using Optimizilla or RIOT.


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