What is a multi-size .ico file?

An ICO file is an archive container that holds multiple versions of an image at different pixel dimensions (such as 16x16, 32x32, and 48x48). Operating systems and browsers automatically pick the sharpest size depending on screen resolution and UI scale.

Does the converted .ico preserve transparent backgrounds?

Yes. If your source image is a transparent PNG or SVG vector, the full 32-bit RGBA transparency channel is preserved across all generated icon sizes.

Where should I place favicon.ico on my website?

Place the generated favicon.ico in the root directory of your web server (e.g. https://yourdomain.com/favicon.ico) and link it in your HTML via .

Can I use this ICO for Windows desktop software shortcuts?

Yes. Windows desktop applications and shortcut files (.lnk) natively support standard ICO files containing 16px, 32px, 48px, and 256px icon layers.

Is my image uploaded to external servers during conversion?

No. Image scaling and binary ICO file assembly are handled completely within your browser using HTML5 Canvas and Uint8Array binary packing.

ICO Converter & Favicon Maker

Convert PNG, JPG, WebP, or SVG images into multi-size Windows .ico files.

100% free
Private in browser
No signup
No watermarks

Select filesTap to choose a fileor drop files here

Rate this tool

Be the first to rate — helps others and improves this page.

About ICO Converter & Favicon Maker

Need a standard Windows .ico icon file or a multi-resolution favicon.ico for your website? The ICO Converter on TheToolss transforms your PNG, JPEG, SVG, or WebP graphics into standard multi-layer ICO binary files entirely in your browser. Embed crisp 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 pixel mipmaps inside a single icon container for seamless compatibility across web browsers, desktop shortcuts, and operating systems.

How to use ICO Converter & Favicon Maker

Upload your source PNG, JPG, WebP, or SVG logo or graphic.
Select which icon sizes you wish to bundle into the ICO file (16px to 256px).
Download your multi-resolution favicon.ico file with one click.

Key features

Generates true multi-layer Windows .ico binary files
Supports 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 resolutions
Retains transparent alpha channels from PNG and SVG sources
100% private in-browser canvas rendering — files are never sent to a server
Individual PNG size downloads also supported

Frequently asked questions

What is a multi-size .ico file?: An ICO file is an archive container that holds multiple versions of an image at different pixel dimensions (such as 16x16, 32x32, and 48x48). Operating systems and browsers automatically pick the sharpest size depending on screen resolution and UI scale.
Does the converted .ico preserve transparent backgrounds?: Yes. If your source image is a transparent PNG or SVG vector, the full 32-bit RGBA transparency channel is preserved across all generated icon sizes.
Where should I place favicon.ico on my website?: Place the generated favicon.ico in the root directory of your web server (e.g. https://yourdomain.com/favicon.ico) and link it in your HTML <head> via <link rel="icon" href="/favicon.ico">.
Can I use this ICO for Windows desktop software shortcuts?: Yes. Windows desktop applications and shortcut files (.lnk) natively support standard ICO files containing 16px, 32px, 48px, and 256px icon layers.
Is my image uploaded to external servers during conversion?: No. Image scaling and binary ICO file assembly are handled completely within your browser using HTML5 Canvas and Uint8Array binary packing.

Related In-Depth Guides

Learn practical workflows, real-world examples, and expert tips in our comprehensive guides:

Media & Video · 5 min read

Video Bitrate & File Size Calculator Guide: Optimize Bandwidth & Storage for Streaming

How video resolution, framerate, and compression bitrates impact file size in MB/GB. Complete bitrate recommendations for 1080p, 4K, and timelapse projects.

Image & Graphics · 6 min read

Image Resize, Compress, and Convert: A Practical Guide for Web and Forms

Resize for social presets, compress JPG/PNG/WebP, convert HEIC, and stamp watermarks — free browser image tools for creators and job portals.