Does it produce a .ico file?

No — it produces PNGs. All modern browsers accept PNG favicons via link tags, which the included snippet sets up.

Why nine different sizes?

Different contexts ask for different sizes: browser tabs, bookmarks, iOS home screens and PWA install icons.

No. Every size is generated on a canvas in your browser.

It is centered on a transparent square canvas of the longer edge before scaling, so nothing gets squashed. The tool warns you when this happens.

Image Tools100% Private · In-Browser

Drop one logo and get every favicon size from 16px to 512px, plus the exact HTML tags to wire them into your site.

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Generates nine PNG sizes in one pass: 16, 32, 48, 64, 96, 128, 180, 192 and 512 px.
Non-square artwork is centered on a transparent square canvas first, with a notice explaining what happened.
Each size renders at true proportions with high-quality smoothing for crisp small icons.
Download sizes individually or grab all nine at once.
Includes a copy-paste head snippet with favicon and apple-touch-icon link tags.

Drop A Square Image
A 512×512 logo is ideal, but any image works.
Review The Nine Sizes
Every icon renders immediately with its pixel dimensions labelled.
Download The Files
One by one, or use Download all — your browser may ask to allow multiple downloads.
Wire Them Up
Copy the snippet, drop the PNGs into your /public folder, and paste the tags into the head.

Simple, high-contrast shapes survive 16px; fine details and thin strokes will not.
The 180px file is the apple-touch-icon; 192 and 512 px suit Android and PWA manifests.
If your source is not square, check the preview — it shows the centered, padded result.

Image, PDF, text, calculator and media utilities — all free, all private, all running right in your browser.