ICO Online Converter - Online Convert ICO Icons

Free online ICO converter tool, supports one-click conversion of PNG, JPG, GIF, WebP and other common image formats to ICO icon format. Customizable multiple sizes and corner radius, batch processing more efficient, 100% local processing protects privacy.

Click or drag images here

Supports .png, .jpg, .gif, .webp formats | Up to 20 images batch upload | Maximum 50MB per file

Files pending conversion

No image files pending conversion, please upload your images first

ICO conversion parameter settings

Tip:Windows icons recommend using 16×16, 32×32, 48×48 sizes; website favicon recommends 32×32 or 64×64.

Tip:Corner radius determines ICO icon corner roundness, 0% is square corners, 50% is circular, 100% is fully rounded. Website favicon recommends 0%-20%, application icons can be adjusted according to design style.

Why choose our ICO conversion tool?

⚡

Batch efficient conversion

Say goodbye to single-file tediousness! Supports up to 20 image files processed simultaneously in parallel, one-click batch generation of ICO icons.

📐

Multi-size export

Supports 16×16 to 256×256 multiple sizes free selection, meeting Windows icons, website favicon and other different scenario needs.

🎨

Wide format compatibility

Supports PNG, JPG, GIF, WebP and other common image formats conversion to ICO, covering all image formats you use daily.

🔗

Remote URL conversion

No need to download first then upload, enter network image address, tool automatically fetches and converts to ICO format.

👁️

Real-time preview comparison

After conversion, provides clear "original vs ICO icon" effect comparison, optimization effects visible.

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Pure local secure processing

Core conversion logic runs entirely in your browser locally, image data never uploaded to any third-party servers. 100% protects your privacy and commercial asset security.

What is ICO format? Why convert to ICO?

ICO (Icon File Format) is a dedicated file format for storing icons in Windows operating system. Compared with regular image formats, ICO format has unique advantages, making it the preferred format for system icons, website favicon and other scenarios.

Comparison Dimension
PNG/JPG Format
ICO Format
File structure
Single size image
Multi-size package (16×16 to 256×256)
File size
Single size, larger
Multi-size package, overall better
Transparency channel
PNG supports transparency
Perfectly supports Alpha transparency
Applicable scenarios
Web display, image sharing
System icons, program icons, favicon
Browser support
All browsers universal
Perfect support for all modern browsers

ICO Online Converter Application Scenarios

ICO online converter tool is suitable for multiple scenarios, helping you quickly create professional icon files:

  • Website development: Create website favicon.ico icon, let browser tab display website logo
  • Desktop application development: Create professional icon files for Windows applications
  • UI design: Convert design drafts to ICO format for software interface icons
  • Daily use: Customize folder icons, shortcut icons etc.

How to use ICO Online Converter Tool?

Using our ICO online converter tool is very simple, just follow these steps:

  1. Prepare image: Prepare a PNG, JPG, GIF or WebP format image, recommended size larger than 256×256 pixels
  2. Upload image: Click upload area or drag image to page, or upload network image via URL
  3. Select parameters: Select needed ICO sizes (such as 16×16, 32×32, 48×48), adjust corner radius (0%-100%)
  4. Start conversion: Click "Batch convert to ICO" button, wait for conversion to complete
  5. Download icon: After conversion, single download or package download all ICO files
📌 Security Compliance Statement:This tool follows strict privacy protection policies. Your images don't need network transmission during conversion, all conversion operations are completed on your local device, please use with confidence.

ICO Conversion Frequently Asked Questions (FAQ)

Q1: What is ICO format used for?
A: ICO is Windows system icon file format, mainly used for: 1) Website favicon icon (browser tab display); 2) Desktop shortcut icon; 3) Application icon; 4) Folder icon etc. It can package multiple icon sizes in one file, adapting to different display environments.
Q2: Which ICO sizes are most commonly used?
A: Windows system most commonly used ICO sizes are 16×16 (small display, like title bar), 32×32 (standard size, like folder), 48×48 (large icon, like desktop). Recommend at least selecting 16×16, 32×32, 48×48 combination for best compatibility. Website favicon recommends 32×32 or 64×64.
Q3: Does it support transparent background?
A: Yes, converted ICO file perfectly supports Alpha transparency channel, can preserve original image's transparent background effect. This is very important for icons needing transparent background (like software logo, emoji icons).
Q4: Will batch uploading 20 large images consume my phone data?
A: Absolutely not! This tool is a "pure frontend local image converter". All image encoding/decoding work is done in your computer or phone's browser, no need to upload to server, can be used normally even in offline state.
Q5: How to use converted ICO file as website favicon?
A: After conversion, name the file favicon.ico, upload to website root directory. Add <link rel="icon" href="/favicon.ico"> in HTML head section, browser will automatically display your website icon.

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