In practice, it’s best to use JPEGs for the majority of your images and only use PNGs for simple graphics, images with text, or images that require transparency. Use SVG for logos and vector-based graphics. Use PNG if the image is simple, has sharp lines, clearly separated areas of colours and text. Use JPEG for images with many different colours, gradients and textures. The goal is to reduce the overall file size footprint of your images as much as possible without compromising their quality too much, so a combination of formats is best. SVGs are only suitable for specific types of images, so if your page design relies solely on simple illustrations or vector-based graphics, then you may opt to go all SVG. Compressing them too little may result in a higher-than-desirable file size. In this example, the photos served as PNGs are much larger and take much longer to load compared to the JPEG photo.Ĭonversely, you shouldn’t serve all your images as JPEGs, as you need to be careful about how much you compress them with image quality suffering with higher compression levels. PNGs do a particularly great job when you have an image with distinct transitions between colours that need to remain sharp.įor example, when you’re taking a screenshot of a user interface where different elements transition between dark and light backgrounds, it’s much better to use PNGs. They are the go-to format for images that need to maintain their original quality, which is usually the case for logos, charts, and infographics. PNGs are best used for screenshots, simple graphics, and any images that contain text. Lastly, JPEGs have no support for transparency, so don’t use JPEGs if you need your images to utilize transparency. You can get much better quality and file sizes with an alternative format. They are also less suitable for monochrome and line-based graphics.
JPEGs are not great for images with very little colour data, like interface screenshots and other simple computer-generated graphics. Opt for 70% to 90% depending on how the resulting image quality looks.
They are also suitable for images with no transparency, background images and patterns, as well as any other image where image quality is secondary to performance.ĭon’t select 100% quality when exporting JPEGs. JPEGs are best used for photos, and static images with a lot of different colours and details. We recommend picking formats based on their strengths, and how well they align with your website’s purpose. Selecting a suitable format to serve your images depends on your website goals (i.e., design, performance, audience, etc.). Overall, SVG is the third-most commonly used image format on the web, behind PNG and JPEG. SVG images are the main format to use to display a vector image on your website. They can be scaled to whatever size is needed without sacrificing quality due to their algorithmic nature. When you shrink or enlarge a vector image, the curves and lines get modified on a mathematical level.
Vector graphics like SVGs can scale to any size without losing quality. JPEG employs lossy compression – the higher the compression level, the smaller the image file size, and the lower the image quality. JPEGs have the widest support among browsers and devices, and are very commonly used across the web. Let’s explore some common raster image formats below: Read more on lossless vs lossy compression here. Pixel data is stripped from the original image when the compression is performed to reduce file size at the expense of quality. Image data is merely optimized and quality is the same as the original image. No pixel data is removed from the original image when the compression is performed. In addition, raster images can be compressed losslessly or lossily: Once they are exported to JPEG, PNG or GIF, they are raster images. While the most common raster image example is a photograph, you can create raster images from any variety of graphic design tools or computer rendering software. High resolution/quality raster images have a high pixel count for sharper quality and better colour representation.
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