Optimizing Photos for Web

Tip Sheet (PDF)

Benefits of Optimizing Photos for the Web:

  1. Improved Page Load Speed: Large image file sizes can significantly slow down web pages, leading to higher bounce rates and decreased user satisfaction.
  2. Bandwidth Optimization: Optimized images consume less data. This reduces network strain, allowing for faster image delivery and lowering data usage costs.
  3. Enhanced User Experience: Fast-loading images contribute to a positive user experience by reducing wait times and providing immediate visual content. Users are more likely to stay engaged and explore further when they can quickly access images without interruptions.
  4. Mobile Responsiveness: With the prevalence of mobile browsing, optimizing photos is critical. By reducing file sizes, images can load faster on mobile devices, accommodating users with limited bandwidth and ensuring a seamless experience across different screen sizes.

Optimal Image Format:

JPEG (Joint Photographic Experts Group) is preferred for Web use when choosing an image format. JPEG files are known for their compression algorithm, which reduces file sizes without compromising image quality. This means that JPEG is ideal for quickly loading Web pages.

Resolution Optimization:

Resolution can significantly optimize an image's visual impact while minimizing its effect on Web page load times. A resolution of 72 DPI (dots per inch) is widely recommended for effective Web optimization since it ensures image clarity while maintaining a smaller file size. By adjusting the resolution of your images to 72 DPI using image editing programs, you can optimize them for web usage.

Optimal Image Dimensions:

Determining the appropriate size for a photo on your website is essential to avoid excessive file sizes. It is recommended to set the width or height in pixels (px) to optimize loading times and overall website performance (Look below to view how different-sized images look in Cascade CMS). Maintaining the image's aspect ratio while resizing is important to prevent distortion. You can also consider cropping the image to refine its composition if needed.

CMS Size Examples (By Pixel Width)

100 px


150 px (Standard Mugshot Image)

Example of image that is 150 pixels in width

250 px 

Example of image that is 250 pixels in width

350 px 

Example of image that is 350 pixels in width

450 px

Example of image that is 450 pixels in width

700 px

Example of image that is 700 pixels in width