How to Convert an Image to ICO Online
Follow these three simple steps to convert images to ICO files for Windows icons or website favicons. No software installation required. Free and secure.
Add Images
Select supported images, choose an entire folder, or drag and drop multiple files into the browser.
Choose the ICO Size
Select a preset size from 16×16 to 256×256 pixels, or enter custom width and height dimensions. The selected dimensions apply to the entire batch.
Convert and Download
Start the conversion, review the ICO results, and download files individually or together in a ZIP file.
How Does the ICO Converter Work?
The CompressFly ICO converter turns supported images into ICO files at the width and height you select, directly in your browser. Unlike online converters that require file uploads, CompressFly handles image conversion with modern browser technology. No files are sent to a server: everything is processed locally, individually or in bulk. Smart image conversion makes changing formats simple and free, with no signup required.
What "in your browser" means
- Images are not uploaded to a server
- ICO conversion runs locally on your device
- Converted ICO files are downloaded directly from your browser
Favicon Generator
Use the image to ICO converter to create an ICO favicon from a logo, symbol, or another supported image. Each conversion creates one selected ICO size, so additional sizes can be made by running the converter again.
Website Favicon
Create an ICO file that can be used as a favicon in browser tabs, bookmarks, and other website contexts.
Small-Size Legibility
Use a simple, high-contrast design that remains recognizable when reduced to favicon dimensions.
Square Source Artwork
Start with a square image when possible to reduce distortion and keep spacing consistent around the icon.
Additional ICO Sizes
Run the converter again with another size when separate ICO files are needed for different display contexts.
Create ICO Files for Windows Icons
Convert a logo, symbol, or other supported image into an ICO file for a Windows shortcut, desktop icon, or application icon. Select a standard icon size or enter custom dimensions based on where the ICO will appear.
Image to ICO conversion runs directly in your browser, so your source image is not uploaded to a server. No account, credit card, or software installation is required.
Why Use CompressFly to Convert Images to ICO?
Fast Image to ICO Conversion
Convert images to ICO directly in your browser without waiting for files to upload to or download from a server.
Batch ICO Conversion
Convert 300+ supported images to ICO at once, then download the completed batch as a ZIP file.
No Software Installation
Use the image to ICO converter in your browser without installing desktop software or plugins.
Easy to Use
Add images, select an ICO size, start the conversion, and download the results without prior technical knowledge.
Preview Before Downloading
Review each converted ICO image and its output file size before downloading it to your device.
Private & Secure
Your source images are processed locally in your browser and are not uploaded to a server.
ICO Size Guide
Choose the ICO dimensions that match the website, Windows interface, or application where the icon will appear.
| ICO Size | Common Use | What to Check |
|---|---|---|
| 16×16 or 32×32 | Website favicons and other small icon contexts | Keep shapes simple and confirm the design remains recognizable |
| 24×24 or 48×48 | Windows interfaces, lists, and shortcuts | Check edges, spacing, and contrast at the required size |
| 64×64 to 128×128 | Larger interface and application icon assets | Use a sharp source image with enough original pixels |
| 256×256 | High-resolution Windows icon assets | Inspect fine edges and transparency before using the file |
| Custom dimensions | Projects with a specific width and height requirement | Confirm the destination accepts the selected dimensions |
Each conversion creates an ICO file at the selected dimensions. Run the converter again to create another size. This tool does not combine multiple sizes into one ICO file.
Related Icon and Image Tools
Image to ICO Converter FAQ
How do I convert an image to ICO online?
Convert an image to ICO online in three steps: 1. Add one or more supported images or select an entire folder. 2. Choose a preset ICO size or enter custom dimensions. 3. Start the conversion, then download files individually or together in a ZIP file.
Is the image to ICO converter free?
Yes. It is free to use, with no daily limits or watermarks. No account or credit card is required.
Can I use this tool as a favicon generator?
Yes. Add a supported logo, symbol, or image, choose the required dimensions, and create an ICO file that can be used as a website favicon.
What image formats can I convert to ICO?
The converter accepts JPG, JPEG, PNG, WebP, GIF, AVIF, BMP, and many other supported image formats.
Which ICO size should I choose?
16×16 and 32×32 are common small favicon sizes. Windows icons may require 24×24, 48×48, 256×256, or other dimensions depending on where the icon will be used.
Is there a file size limit, and are my images uploaded?
Your images are processed locally in your browser and are not uploaded to a server, so there is no server upload limit. The practical limit depends on your device's available memory and processing power, especially for very large images or batches.
How do I add an ICO favicon to my website?
Rename the downloaded file to favicon.ico if needed, upload it to your website, and reference its path from the page head with <link rel="icon" href="/favicon.ico">. The exact file path depends on your website setup.