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What is a pixel?

A pixel, short for "picture element," is the smallest unit of a digital image or graphic that can be displayed and manipulated on a digital display device. Pixels are the basic building blocks of digital images, forming a grid that collectively presents the complete picture. Each pixel can be assigned a specific color, and the density of pixels within a given space (commonly measured in pixels per inch, or PPI) determines the resolution and clarity of the image.

Pixels are an essential element in web design, digital photography and computer graphics, encoding visual information for detailed representations on websites. When creating a professional website, pixels play a crucial role by ensuring that visual information is rendered with precision at the pixel level, resulting in sharp and detailed visuals.

History and evolution of pixels

The history and evolution of pixels trace back to the early days of computing and digital imaging technologies. Initially, computer displays were limited in their capability to present detailed images, with early graphics consisting of large, visible blocks representing single pixels.

Over time, as technology advanced, the size of pixels decreased, enabling a higher density of pixels per inch and significantly improving image resolution. This evolution was paralleled by advancements in digital storage and processing power, allowing for the creation and manipulation of increasingly complex and high-resolution images.

Early milestones in pixel development were closely tied to the video game industry and computer-generated imagery (CGI) in films, which pushed the boundaries of what was achievable with pixel technology. Today, pixels are at the heart of almost all digital display and imaging technologies, from the screens of the latest smartphones to the high-definition monitors used for professional graphic design and visual arts.

How a pixel works

At its core, a pixel symbolizes a single point in a digital image. Collectively, these points compose the full image visible on a screen. Pixels have the capacity to showcase a broad spectrum of colors, typically expressed through a blend of red, green, and blue (RGB) light values. The precise combination of these RGB values dictates the specific color that a pixel exhibits. Adjusting these values across the pixel grid culminates in a vivid, colorful image.

The orchestration of pixel illumination and color is overseen by advanced graphics processing units (GPUs), which calculate the necessary RGB values for each pixel to produce real-time images. This coordination of hardware and software facilitates the static displays of photographs and web content as well as the dynamic rendering essential for video playback and gaming.

Pixel components

  • Pixel code: A pixel is a snippet of code placed onto a website. This code consists of a combination of numbers that dictate the RGB values and location of the pixel on the website.

  • Pixel size: The physical dimensions of a pixel vary depending on the technology used to display it. For example, pixels on an older CRT (cathode-ray tube) display are larger than those found in modern LED or OLED screens.

  • Pixel density: Pixel density, measured in pixels per inch (PPI), indicates the number of pixels that fit within a one-inch line on a digital display. This measurement helps to determine image resolution and clarity.

  • Cookies: Cookies are small files stored on a user's device that collect information on a user's browsing activity, allowing for targeted advertising and website customization. Pixels and cookies function together by collecting data on user behavior and preferences. While pixels track user activity on a website, cookies store information to enhance user experience and provide personalized content.

Key terms related to pixels 


Pixelation occurs when an image is enlarged beyond its resolution, causing visible pixels as blocks of color. This can result in loss of detail and a grainy appearance. While often undesirable in digital imaging and web design, pixelation can be used intentionally for artistic or retro gaming effects. Managing pixelation is crucial for maintaining image quality, with techniques like anti-aliasing and proper scaling used to minimize its impact.


Resolution in digital displays and images refers to the degree of detail determined by the pixel count. A higher resolution translates to sharper images showcasing intricate details, significantly enhancing image quality in digital photography and screen sharpness. The increased pixel density allows for more precise rendering of visuals.

Pixel density (PPI)

Pixel density refers to the concentration of pixels on a digital display, measured in pixels per inch (PPI). Pixel density plays a pivotal role in ensuring that websites appear sharp and clear on various devices. A higher pixel density means more pixels are packed into the same physical space, resulting in finer detail and smoother images. When designing a website, understanding the typical pixel densities of the devices their audiences use is crucial for optimizing images and layouts. This ensures web content is visually appealing and readable on any device. Balancing image resolution and file size is crucial for loading times, making pixel density a key factor in web design and an optimized user experience.


A megapixel is a unit of measurement often used in digital photography to denote the resolution of an image. It signifies a million pixels, calculated by multiplying an image's width in pixels and its height in pixels. For example, an image with a resolution of 1280x720 pixels is approximately 0.92 megapixels. Megapixels are also used to measure screen resolutions and screenshots. Higher megapixel values in screenshots indicate a greater level of detail, making images clearer. This metric is crucial for understanding the quality of images captured from screens, especially when these images are used for website content such as infographics.

Dead pixel

A dead pixel is a malfunction within an individual pixel on a digital display, where the pixel fails to illuminate or only shows one color regardless of the content being displayed. This results in a permanently black or colored dot on the screen that does not change when the display's image or color changes. Dead pixels can occur as a result of manufacturing flaws, physical damage to the screen, or long-term usage and wear.

Stuck pixel

A stuck pixel is a specific type of display malformation where a pixel remains fixed on a single color (red, green or blue) or shows as a very bright white dot. Unlike dead pixels, which are completely unresponsive and appear as black spots, stuck pixels can still emit light, just not in the correct colors according to the displayed image. They occur when one or more of the subpixels that compose an individual pixel fail to refresh. Stuck pixels may become less noticeable or even get fixed over time with software solutions that attempt to "unstick" pixels by rapidly cycling them through various colors.


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Importance of pixels in website creation 

The role of pixels in website creation cannot be overstated, as they are fundamental in determining a website's visual sharpness, appeal and overall user experience. For digital creators, especially those aiming to create an online portfolio, the precise manipulation of pixel characteristics—such as pixel density and color—becomes essential in showcasing their work in the best possible light.

Website building platforms like Wix understand the delicate nature of pixels and incorporate best practices in pixel management into their website templates. For example, all Wix templates incorporate responsive design, automatically adapting images and layout elements to ensure a high quality display across devices with varying screen resolutions and pixel densities.

Best practices for using pixels

We recommend to follow these tips when implementing visuals onto your website:

  • Understanding pixel and resolution dynamics: Learn how pixels and resolution impact image quality and be sure to select or create images with suitable resolutions in your website.

  • Implementing responsive design: Ensure your website adapts smoothly to various devices and screen sizes for an optimal user experience.

  • Choosing correct file formats and sizes: Select image formats and sizes that maintain quality while considering website load times in order to not harm your website performance and storage capacity.

  • Enhancing detail with subpixel rendering: To refine color and image detail by adjusting subpixels, you can make fine adjustments to the individual red, green and blue subpixels that make up each pixel on the screen. By tweaking the intensity and balance of these subpixels, you can enhance the overall color accuracy and sharpness of the display—resulting in more vibrant colors and realistic images.

Pixel FAQ

What is a simple definition of a pixel?

A pixel is the smallest unit of a digital image or display that can be individually controlled or displayed, used collectively to create a complete image or graphic by varying colors and brightness.

What does one pixel look like?

What is a pixel in web design?

What is a good pixel size for an image? 

How do pixels affect website performance?


Related Term

Graphical User Interface

Related Term


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