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# The Importance of Website Icons (Favicon)
- URL: https://huizhou92.com/the-importance-of-website-icons-favicon/
- Published: 2025-02-18T03:30:38.000Z
- Updated: 2026-09-06T11:40:38.000Z
- Description: This article explores the importance of favicons in web design, covering usage scenarios, setup methods, size requirements, and format choices to enhance user experience and site recognition.
- Author: huizhou92
- Tags: tech, web, #lang-en

Recently, [Tao Shu's Blog](https://taoshu.in/?ref=huizhou92.com) published an article about reciprocal links, and I took the initiative to request a link exchange. Tao Shu promptly responded and kindly reminded me that adding a `favicon (icon)` to my blog would help RSS subscribers quickly identify it. At that moment, I wondered, "What is a `favicon`?" (The struggles of a backend developer!)

Later, I consulted DeepSeek:  
In web design, icons are small yet significant elements. They assist users in quickly identifying a website and enhancing the overall user experience.

### Common Usage Scenarios:

- **Browser Tab**: Displayed next to the webpage title.
- **Bookmark Bar**: Shown when users save a webpage.
- **Home Screen Icon**: Displayed when a webpage is added to the home screen on mobile devices.
- **PWA (Progressive Web App)**: Used as the application icon.  
For example:  
![Icon displayed in the browser tab](https://images.hxzhouh.com/blog-images/2025/02/6df56f22e8fad0c4fe55bffcab3ed090.png)  
Icon displayed in the browser tab.  
![Icon displayed in the bookmark bar.](https://images.hxzhouh.com/blog-images/2025/02/c2530b4f9491c01730c710dcd24a325f.png)  
The icon displayed in the bookmark bar.

The icon can be displayed even on Android devices, as the Chrome browser's feature to add a webpage to the home screen allows this.  
![Using Android Chrome to add a webpage to the phone's home screen](https://images.hxzhouh.com/blog-images/2025/02/861e9e820063fe4d7bbff32e9f8de05b.png)

## How to Set Up

The simplest way to set an icon is to add a line in the  section of the webpage. 

```html

```

If you are using Hugo or other tools, there may be specific settings for the favicon.  
Some large websites, such as `google.com` and `apple.com`, may have more considerations, and their setups may differ.

## Important Considerations

The icon size is also essential to optimize the user experience and achieve the best display effect across various scenarios.

### Common Sizes:

- **16x16**: Browser tab icon.
- **32x32**: Bookmark bar icon.
- **64x64**: High-resolution screen icon.
- **180x180**: iOS device home screen icon.
- **192x192** and **512x512**: PWA icons.  
This is why we often see multiple icons set on some websites, such as the [Hugo website](https://gohugo.io/?ref=huizhou92.com).  
![Hugo website has set two icons](https://images.hxzhouh.com/blog-images/2025/02/4d83d2d0666f924072095b981ba2ff0e.png)

Modern browsers support selecting different icon sizes based on various scenarios and screen PPI, striving to achieve the best display effect in all situations.

### Choosing Icon Formats

Icons can be created in different image formats, specified by the type attribute. Standard icon formats include:

- **ICO**: Traditional format, good compatibility, supports multiple sizes.
- **PNG**: Modern format, supports transparent backgrounds, and is suitable for high-resolution screens.
- **SVG**: Vector format, infinitely scalable without losing quality, suitable for responsive design.

### Multi-Resolution Icons

If maintaining multiple icon files seems cumbersome, you can use a multi-resolution icon (Multi-Resolution ICO or Multi-Size ICO), a single file containing various sizes and color depths. This allows multiple bitmaps (BMP or PNG format) to be stored in one file.  
An ICO file includes:

- **File Header**: Defines the ICO file type and the number of images it contains.
- **Image Directory**: Describes the size, color depth, offset, and other information for each image.
- **Image Data**: Contains the actual pixel data for the images.  
When a browser needs an icon, it selects the most appropriate size from the ICO file. The downside is that an ICO file containing multiple sizes may be larger than a file with a single size.

This article does not delve deeper into topics such as the `manifest.json` unique to Android Chrome or the `apple-mobile-web-app-capable` for Apple devices. Interested readers are encouraged to explore further.

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