Base Icon Size (pixels) Enter your source icon dimension (e.g., 512 for a 512x512 pixel image)

Quick Examples:

High-Resolution Icon (512px) Medium-Resolution Icon (128px)

Calculate Clear

This calculator is for informational purposes only. Verify results with appropriate professionals for important decisions.

What Are Required Favicon Dimensions

Required favicon dimensions are the standard pixel sizes needed for website icons across different browsers and platforms. A favicon is the small image that appears in browser tabs, bookmarks, and mobile home screens. Different devices and browsers require different icon sizes to display properly. Having all the correct sizes ensures your icon looks sharp everywhere.

How Required Favicon Dimensions Are Calculated

Formula

The calculator checks each standard favicon size against your source image size. When your base icon is larger than or equal to a target size, you can scale down to create that favicon without losing quality. Scaling down preserves image clarity because you are removing pixels, not adding them. If your source image is smaller than a target size, that favicon cannot be created without stretching, which causes blurriness. The calculator filters the standard sizes to show only those you can generate properly.

Why Required Favicon Dimensions Matter

Knowing which favicon sizes you can generate helps you plan your icon creation process and ensure your website looks professional across all devices and platforms.

Why Correct Favicon Sizes Are Important for Web Development

Using incorrect favicon sizes causes display problems that make a website look unprofessional. Icons may appear blurry, pixelated, or stretched when browsers resize them. This affects user trust and brand perception. Modern platforms like iOS, Android, and Windows each have specific size requirements. Missing sizes can result in default icons appearing instead of your custom brand image.

For Web Developers

Web developers need to generate multiple favicon sizes to support different browsers and devices. Starting with a high-resolution source image (at least 512 pixels) allows creation of all standard sizes. This calculator helps developers verify their source image is large enough for complete favicon coverage.

For Graphic Designers

Designers creating brand assets need to know the minimum source image size for full favicon support. This calculator shows which sizes are achievable from a given design file. Starting with a 512x512 pixel canvas ensures all standard favicon sizes can be exported without quality loss.

Example Calculation

A web developer has a source icon image that is 256 pixels wide and 256 pixels tall. They want to know which standard favicon sizes they can generate from this image for a client website.

The calculator compares the base icon size (256 pixels) against each standard target size. Sizes 16, 32, 48, 64, 96, 128, 180, 192, and 256 pixels are all less than or equal to 256, so they are supported. The 512-pixel target is larger than 256, so it cannot be generated without quality loss.

Supported Sizes: 16px, 32px, 48px, 64px, 96px, 128px, 180px, 192px, 256px
Unsupported Sizes: 512px

This result tells the developer they can generate 9 out of 10 standard favicon sizes. For the 512-pixel size needed by some high-resolution platforms, they would need a larger source image. They may consider requesting a higher resolution logo from their client or using a vector source file.

Frequently Asked Questions

Who is this Favicon Calculator for?

This calculator is designed for web developers, graphic designers, and website owners who need to create favicon images. It helps anyone preparing website icons determine which sizes can be generated from their source image.

What is the minimum recommended source icon size?

A source icon of at least 512 pixels allows you to generate all standard favicon sizes. If you only need common web favicons (up to 192 pixels), a 256-pixel source works well. The larger your source image, the more sizes you can create.

Why can I not generate larger favicon sizes from a smaller source?

Scaling an image up requires adding pixels that were not in the original. This causes blurriness and pixelation. Favicon sizes should always be generated by scaling down from a larger source image to maintain sharp, clear icons.

Can I use this calculator for vector image formats like SVG?

Vector images like SVG can be scaled to any size without quality loss. This calculator is designed for raster image formats (PNG, JPG, ICO) that have fixed pixel dimensions. If you have a vector source, you can generate any favicon size regardless of the calculator results.