Are my images uploaded to a server?

No. The entire conversion runs inside your browser using the HTML5 Canvas API and JavaScript ArrayBuffers. Your image never leaves your device.

What image formats can I upload?

JPG/JPEG and PNG files are both accepted. The tool reads the file locally and draws it onto a canvas, so any format your browser can decode will work.

Why does the ICO contain multiple sizes?

Browsers and operating systems pick the best resolution from available sizes. Including 16px (browser tab), 32px (taskbar), 48px (desktop shortcut), and 64px (high-DPI display) ensures sharp rendering everywhere.

Can I choose which sizes to include?

Yes. Use the size checkboxes before downloading. At least one size must be selected. Including all four sizes is recommended for maximum compatibility.

Will the icon look sharp at 16x16?

The tool uses bilinear-like downscaling via the browser's Canvas API. For best results at small sizes, use a simple logo or icon rather than a detailed photograph.

Is the downloaded file a valid .ico?

Yes. The file follows the standard ICO binary format (ICONDIR + ICONDIRENTRY headers + PNG-compressed image data per size) and can be used directly as a favicon.ico or Windows icon.

JPG to ICO Converter

Upload a JPG or PNG and download a multi-size .ico favicon instantly — converted entirely inside your browser.

Upload Image

Click or drag a JPG / PNG here

JPG, JPEG, and PNG files supported

Icon Sizes to Include

All four sizes are recommended for maximum browser and OS compatibility.

16 × 16 px Browser tab 32 × 32 px Taskbar 48 × 48 px Desktop 64 × 64 px High-DPI

Icon Preview

Upload an image to see icon previews

Each size is shown at actual pixel dimensions

Downloaded!

Summary

This tool converts JPG and PNG images into ICO favicon files entirely inside your browser using the HTML5 Canvas API. No files are ever uploaded to a server — your images stay completely private on your device. The generated .ico file contains four embedded sizes (16x16, 32x32, 48x48, and 64x64 pixels) so browsers and operating systems can pick the best resolution automatically. ICO files are the standard format for website favicons and Windows application icons.

How it works

Select or drag a JPG or PNG image onto the upload area.
Choose which icon sizes to include (16, 32, 48, 64 px).
The tool draws each size onto a hidden Canvas element in your browser.
Raw PNG-compressed pixel data for each size is packed into a valid ICO binary.
A preview grid shows each size at actual pixels before you download.
Click "Download ICO" to save the favicon.ico file to your device.

Use cases

Create a favicon.ico for a website from a logo or brand image.
Generate Windows application icons from a photo or graphic.
Produce multi-resolution ICO files without installing software.
Convert a high-resolution PNG logo to a compact .ico for browser tabs.
Prepare favicons for static site generators that require an ICO file.
Quickly test how a logo looks at small icon sizes before finalizing it.
Replace a missing favicon without leaving the browser.
Process brand images privately without uploading to a third-party service.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu