Should I Pre Blur By Image Or Css

CSS Programming

When it comes to blurring images on a website, there are two primary methods that can be used: pre-blurring the image or using CSS to apply the blur effect. Each approach has its own set of advantages and considerations, and the decision on which method to use ultimately depends on your specific use case and requirements.

Pre-Blurring the Image

Pre-blurring an image involves using image editing software or tools to apply a blur effect to the image before it is uploaded to the website. This means that the blurred image is loaded directly onto the webpage, eliminating the need for any additional CSS or JavaScript to create the blur effect. Pre-blurring can be useful in scenarios where you want to have more control over the level of blur or if you want to keep the image blur consistent across different devices and browsers.

However, there are some considerations to keep in mind when pre-blurring images. Firstly, pre-blurring can increase the file size of the image, which can impact the loading time of the webpage. This is especially important to consider for websites that prioritize fast loading speeds. Additionally, if you need to change the level of blur or apply different blur effects to the image dynamically, pre-blurring may not be the ideal method.

Using CSS to Apply the Blur Effect

Alternatively, you can use CSS to apply a blur effect to an image directly on the webpage. CSS provides a blur filter property that can be used to achieve this effect. One of the main advantages of using CSS for image blur is that it allows for more flexibility and customization. You can easily adjust the level of blur, apply different types of blurring effects, and even animate the blur effect using CSS transitions.

Using CSS for image blur also has the benefit of not increasing the file size of the image, as the original image remains unchanged. This can be particularly advantageous for websites that prioritize optimizing page load times.

My Personal Recommendation

As a web developer with experience in both methods, I would generally recommend using CSS to apply the blur effect. CSS provides more flexibility and control over the blur effect, and it allows for easy adjustments without the need to pre-process and upload multiple versions of the same image. Additionally, using CSS for image blur helps to maintain optimal page performance by avoiding unnecessary increases in file size.

However, there may be certain scenarios where pre-blurring an image is more suitable. For example, if you have a specific level of blur that needs to be consistent across all devices and browsers, or if you need to apply different blur effects dynamically based on user interactions, pre-blurring might be a better choice.


Both pre-blurring images and using CSS to apply the blur effect have their own merits and considerations. It’s important to carefully evaluate your specific requirements and prioritize factors such as loading speed, flexibility, and customization when deciding which method to use. Ultimately, the choice between pre-blurring or applying the blur effect with CSS will depend on the unique needs of your website or project.