ICO Image Conversion

Convert images to ICO format online. Icon format used for favicons and desktop icons, perfect for website and application icons.

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compressed image format
digital photo format
transparent image format
modern web image
animated image format
bitmap image format
high resolution image
tagged image format
apple photo format
advanced image compression
website icon format
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Convert Image to ICO Online: Free Favicon & Icon Converter

Every website needs a favicon — that small icon that appears in browser tabs, bookmarks, and Google search results next to your site name. Every Windows application needs an icon file. Both require ICO format, which is not something most image editors export by default. If you have a logo, photo, or graphic in PNG, JPG, SVG, JPEG, HEIC, or any other common image format and need to turn it into an ICO file, Transfonic's free online image to ICO converter gets the job done in seconds — no software, no account, no technical knowledge required.

How to Convert Your Image to ICO: Step by Step

Open the tool and drag your image file onto the upload area, or click to browse and select it from your device. This converter supports files for PNG, JPG, JPEG, SVG, WebP, GIF, BMP, TIFF and TIF types; HEIC and AVIF with a max size of up to 10MB. When the file is uploaded, make sure ICO is selected as the output format and click Convert. The tool will process your image and generate an ICO file that you can use as a favicon or desktop icon. Most conversions are complete in less than five seconds. When processing is finished, you hit Download and your ICO file saves to your device.

For all your other image format needs, Transfonic's online image conversion tool covers dozens of combinations in one place.

What Is ICO Format and Why Does It Matter

ICO is a container image format developed by Microsoft specifically for storing icons used in Windows operating systems and web browsers. Unlike regular image formats that store a single image at a fixed size, an ICO file can contain multiple versions of the same image at different resolutions — typically 16×16, 32×32, 48×48, and up to 256×256 pixels — all packaged into a single file. This multi-resolution structure allows browsers and operating systems to automatically select the most appropriate size depending on where the icon is being displayed: a 16×16 version for browser tabs, a 32×32 for taskbars, and a larger version for desktop shortcuts. For web use, the favicon.ico file placed in your website's root directory is what browsers look for by default when displaying your site's icon in tabs and bookmarks. In testing, a 420KB PNG logo converted to ICO in 3 seconds, producing a clean 15KB ICO file ready for immediate favicon use. One important limitation: for best results, use a square source image — non-square images will be cropped or stretched to fit the ICO format's square requirements. For JPEG source files specifically, Transfonic also has a dedicated JPEG to ICO converter for that exact conversion.

Who Needs to Convert Images to ICO

Web developers and designers who are building or relaunching websites require ICO files for their favicon — the small branded icon that appears in browser tabs, bookmarks bars, and increasingly in Google search results beside the titles of pages. Virtually every CMS platform, from WordPress to Shopify and Webflow, supports ICO as the standard favicon format. ICO files are required by app developers developing Windows desktop applications for their application icons and installer images — ICO files are displayed in Windows Explorer, the taskbar, and the Start menu. For example, small business owners creating their own site who have a logo in either PNG or JPG, this tool can generate a favicon for you without the need to hire a developer or learn all about image editing software. ICO conversion is also used by digital marketers managing multiple brand assets, where brand identities across web properties need to be updated or refreshed.

If you are working specifically with JPG source files, Transfonic's JPG to ICO converter handles that conversion directly.

Free, Secure, and Works on Any Device

There is nothing to install, nothing to pay, and no account to create. Transfonic runs entirely in the cloud and works on any device with a browser — Windows, Mac, Android, iPhone, it doesn't matter. Every upload is protected by 256-bit SSL encryption and your files are automatically deleted from the server the moment your conversion is complete. Transfonic does not store, view, or share your images at any point. You can convert as many image files as you need during a session with no limits and no upgrade prompts.

FAQs

What image formats can I convert to ICO?

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Transfonic accepts PNG, JPG, JPEG, SVG, WebP, GIF, BMP, TIFF, TIF, HEIC and AVIF files for conversion to ICO.

What size should my image be before converting to ICO?

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For best results, use a square image — 256×256 pixels is the recommended size as it gives the converter the most detail to work with when generating the smaller sizes within the ICO file. Non-square images may be cropped or stretched to fit the square ICO format.

Can I use the ICO file as a favicon for my website?

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Yes. Once you download your ICO file, upload it to your website's root directory and name it favicon.ico. Most browsers and CMS platforms, including WordPress, Shopify and Webflow, will automatically detect and display it in browser tabs and bookmarks.

Does the ICO file support transparency?

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Yes, ICO files support transparency. If your source image has a transparent background — such as a PNG logo — the transparency will be preserved in the ICO output, which is important for icons that need to display cleanly on different colored backgrounds.

Is it safe to upload my images to Transfonic?

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Yes. All uploads are protected by 256-bit SSL encryption and files are automatically deleted from the server immediately after conversion is complete.

Image to ICO Converter – Free Favicon & Icon Maker, No Signup | Transfonic