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Image Tools · Updated October 19, 2026

Image to ICO Converter

You can turn a JPG, PNG or WebP image into a multi-size ICO favicon in your browser for free. Pick the source image, choose how it fits the square, and download one ICO file with six icon sizes.

Runs in your browserFree · No sign-up · No watermark
JPGPNGWebPICORuns in your browser
Loading the tool…

Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Formats
JPG, PNG, WebP → ICO
Processing
In your browser
Max size
Up to 50 MB per image
Price
Free, no account
Updated
October 19, 2026
All Image Tools

About Image to ICO

A favicon.ico is a small container that holds the same icon at several resolutions, so a browser tab, a bookmark bar and a Windows shortcut can all show a sharp version. Generating one by hand means exporting half a dozen PNGs and packing them with a tool most people do not have. This page does that in a single step.

Pick a square image, choose whether it should fit inside the icon with transparent padding or fill the square by cropping, and the browser renders 16, 32, 48, 64, 128 and 256 pixel frames, encodes them as PNG and writes the ICO directory around them. Nothing is uploaded, and you can see exactly how each size will look before downloading.

What this tool does

The details that matter when you use Image to ICO for real work.

  • Six sizes in one file

    The ICO contains 16, 32, 48, 64, 128 and 256 pixel frames, covering tabs, bookmarks, shortcuts and high-DPI screens.

  • Transparency preserved

    PNG frames keep transparent backgrounds, so the icon sits cleanly on light, dark or coloured browser themes.

  • Fit or fill

    Keep a whole logo with transparent padding, or crop a photo so it covers the square edge to edge.

  • Size previews

    Every generated frame is shown at its real pixel size, including a browser tab mock-up for the 16 px version.

  • Built in the browser

    Rendering, PNG encoding and ICO packing all happen locally; the source image is never uploaded.

  • Works with JPG, PNG and WebP

    Use a transparent logo for the cleanest result or a photo of any shape for a quick icon.

How to use Image to ICO

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Add a square source image

    A PNG logo of 512 x 512 px or larger gives the sharpest results; JPG and WebP also work.

  2. 02

    Choose fit or fill

    Fit keeps the entire image with transparent padding; fill crops the image to cover the square.

  3. 03

    Click Create ICO file

    The browser renders each icon size, encodes the frames and packs them into one .ico file.

  4. 04

    Check the previews

    Compare the frames and the tab mock-up, then download the ICO with a single click.

  5. 05

    Upload it to your site root

    Place the file at the site root as favicon.ico, or point a link tag at it, then hard-refresh the browser to see it.

Supported formats and limits

Input
JPGPNGWebP
Output
ICO
Processing
Client-side, in your browser. Nothing is uploaded.
Maximum size
Up to 50 MB per image
Requirements
Chrome, Edge, Firefox or Safari on desktop or mobile

Limitations worth knowing

  • The largest frame is 256 px; larger Windows icon formats are not generated.
  • Small icon sizes cannot reproduce fine detail, so text-heavy logos often become unreadable.
  • The ICO is built from PNG frames, which pre-Vista Windows versions do not read.

Privacy and file handling

The source image is decoded, resized and packed into the ICO entirely inside your browser. It is never uploaded to FormatFlow or any third party, and no copy is stored on a server. Closing the page discards everything.

Read the full privacy policy

Image to ICO FAQ

Short, direct answers to the questions people ask before using this tool.
What exactly is an ICO file?
It is a small container format that stores one image at several resolutions together with a directory of offsets. Browsers and operating systems pick the frame that fits the size they need.
Which icon sizes are included?
Every download contains 16 x 16, 32 x 32, 48 x 48, 64 x 64, 128 x 128 and 256 x 256 pixel frames. The largest frame is used by high-DPI screens and Windows shortcut icons.
How do I add the ICO to a website?
Upload it to your site root and browsers request favicon.ico automatically. For explicit control, add a link tag with rel icon and the ICO path to the page head, then hard-refresh.
What happens to the transparent background?
Transparency is stored in every PNG frame, so logos keep smooth edges on any background. A JPG source has no transparency, so choosing Fit adds transparent padding around it.
Does the source image have to be square?
Square is easiest. A non-square image is either letterboxed on a transparent square with Fit or cropped at the edges with Fill; both are shown in the frame previews.
Why does the 16 px icon look different from my source?
At 16 pixels there are only 256 pixels to work with, so fine detail and thin lines disappear. Simple shapes and bold colours survive best; you can also prepare a simplified small icon.
Is a 256 px frame enough for modern displays?
The ICO covers 16 to 256 pixels, which is what ICO consumers expect. For installable web apps and higher-density favicons, modern sites also ship separate PNG icons.
Why is my ICO file a few hundred kilobytes?
The 256 px PNG frame dominates the size. That is normal for a six-size favicon and still small enough for browsers to cache efficiently.
Can I use the ICO for Windows applications?
Yes. The PNG-compressed frames are read by Windows Vista and later, and macOS accepts ICO files for some developer and legacy tools as well.

Background reading

Format guides that explain the trade-offs behind Image to ICO.