Free ICO File Converter
Updated September 2026
Convert a PNG or JPG image into a single-size .ico icon file, right in your browser. Free online ICO converter for favicons and simple Windows icons.
ℹ️ Exports a pixel-perfect ICO file at your chosen size. Compatible with all browsers and operating systems.
Verified Capabilities
Resizes your uploaded image to the chosen size using the Canvas API — no upload, no server round-trip.
PNG sources with an alpha channel keep their transparent background in the downloaded file.
Pick 16×16, 32×32, 48×48, or 64×64 per conversion.
Produces one size at a time as a PNG saved with a .ico extension — not a true multi-resolution Windows ICO container, and no 128×128 or 256×256 option.
Professional image processing once required expensive desktop software. The ICO Converter handles the same job in seconds — entirely in your browser, with no file uploads to external servers.
Convert a PNG or JPG image into a single-size .ico icon file, right in your browser. Free online ICO converter for favicons and simple Windows icons. Results are immediate — no waiting, no loading screens, no account required.
Who uses the ICO Converter?
- Webmasters generating a quick single-size favicon.ico for a site root.
- Developers who need one specific icon size without installing desktop icon software.
- Designers producing a fast preview of how a logo looks reduced to icon size.
Common uses and search terms
The ICO Converter is frequently used for: ico converter, icon file, png to ico, favicon ico. Whether you need a quick result or are working through a longer project, the tool handles all common variations without any configuration.
Why use Allio Tools's ICO Converter?
Your files never leave your device — all processing is done locally using browser JavaScript APIs. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the ICO Converter works on desktop, tablet, and mobile with no app download needed.
See also:JPG to PNG Converter · QR Code Generator · PNG to JPG Converter
How the ICO Converter works
Upload a PNG or JPG image using the file selector.
Choose one output size: 16×16, 32×32, 48×48, or 64×64.
Click Convert to ICO — the resized preview appears instantly.
Click Download .ico to save the file.
Tips & tricks
- The downloaded file has a .ico extension but actually contains PNG image data — it is not a true multi-resolution Windows ICO container. This works fine for most favicon and web uses, but isn't a substitute for a real multi-size ICO if you need one for a Windows desktop application.
- Only one size can be converted at a time — there's no way to bundle 16×16, 32×32, and 48×48 into a single output file here.
- The size dropdown only offers 16×16, 32×32, 48×48, and 64×64 — there is no 128×128 or 256×256 option.
- For a complete favicon set in one pass instead of converting sizes one at a time, use the Favicon Generator tool, which produces 6 PNG sizes from a single upload.
Popular ICO Converter Conversions
Frequently Asked Questions
Does this produce a real multi-resolution Windows ICO file?
No — this tool downloads a single-size image saved with a .ico file extension, not a true multi-resolution ICO container (the binary format Windows uses to bundle several icon sizes into one file). Browsers and most modern favicon setups accept a single-size .ico without issue, but if you specifically need a proper multi-size Windows application icon, use a dedicated desktop icon editor or command-line tool like ImageMagick's `convert` with multiple `-resize` layers.
Can I include multiple sizes in one download?
Not with this tool — you pick one size (16×16, 32×32, 48×48, or 64×64) per conversion and get one file. To cover several sizes, run the conversion again with a different size selected and download each one separately, or use the Favicon Generator tool on this site, which generates 6 PNG sizes at once.
What is an ICO file and when do I need one?
ICO is the traditional Windows image container format used for application icons and the classic favicon.ico file. Modern browsers also accept PNG favicons directly via <link rel="icon">, so a strict ICO container is mainly needed for legacy compatibility.
Does the output support transparency?
Yes. Since the file is generated from a canvas PNG export, transparent backgrounds in your source image (PNG with alpha) are preserved in the downloaded file.
What image formats can I upload?
PNG and JPG. For best results at small sizes, use a source image with a simple, high-contrast design — logos with fine detail lose clarity once reduced to 16×16 or 32×32.
What formats does the ICO Converter support?
The ICO Converter converts between png, jpg, jpeg, webp, and more. All conversions work in both directions — instantly, with no sign-up required.
Is my data safe when using the ICO Converter?
Completely safe. The ICO Converter processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
What image formats does the ICO Converter support?
The ICO Converter works with common image formats supported by your browser, including JPEG, PNG, WebP, and GIF. SVG support varies by tool. No format conversion plugin or driver is needed.
Does the ICO Converter work with large image files?
Yes. The ICO Converter processes files entirely in your browser using the Canvas API. Very large files (over 20 MB) may take a few extra seconds on older or lower-powered devices. Closing other tabs can free up memory for better performance.
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