What is an .ico file and why does it hold several sizes?

ICO is the Windows icon container format. Unlike a plain image, it can store the same icon at several resolutions inside one file, and the browser or operating system picks the best match for each situation — a small favicon in a browser tab, a larger one on the taskbar or a desktop shortcut. That is why this converter lets you bundle 16×16, 32×32, 48×48 and more into a single .ico.

Does converting PNG to ICO keep transparency?

Yes. This tool writes PNG data inside the ICO container (the modern approach all current browsers support), so the alpha channel is preserved. A transparent PNG logo stays transparent in the .ico. If you prefer a solid background instead, switch Background to Color and choose one.

What sizes should I include for a favicon?

16×16, 32×32 and 48×48 cover the vast majority of favicon needs and are selected by default. Add 256×256 if you want a crisp icon on high-DPI displays or for a desktop shortcut. You can also add any custom size up to 256 — that is the largest a classic ICO directory entry can describe.

My image is not square — what does the Fit setting do?

ICO entries are square, so a rectangular source has to be mapped into a square. Contain fits the whole image and leaves transparent (or colored) letterbox space around it. Cover scales the image to fill the square and crops the overflowing edges. Stretch distorts the image to fill the square exactly. Contain is the safest default for logos.

Is my image uploaded to a server?

No. Decoding, resizing and ICO encoding all happen locally in your browser using the canvas API. Your PNG never leaves your machine, which keeps private logos and unreleased artwork fully under your control.

Can I convert JPG, WebP or SVG to ICO too?

Yes. Although the tool is optimized for PNG, any image the browser can decode — JPG, WebP, or SVG — works as the source. Note that JPG has no transparency, so those icons will have a solid background unless the source itself was transparent.

PNG to ICO Converter

Convert a PNG (or JPG/WebP) into a multi-resolution Windows .ico favicon. Pick any sizes from 16×16 up to 256×256 — or add your own — and bundle them all into one file, with alpha transparency preserved. Everything runs locally in your browser.

About this ToolHow it works, benefits & use cases

Turn a PNG (or JPG, WebP, or SVG) into a proper Windows .ico file without leaving your browser. Your image is decoded to a canvas and re-rendered at each size you choose — 16×16, 32×32, 48×48 by default, plus any presets up to 256×256 or a custom pixel size you add yourself — and all of them are packed into a single multi-resolution .ico. Modern ICO embeds PNG data, so the alpha channel is preserved and transparent logos stay transparent. A live preview shows every size on a checkerboard so you can see exactly how each icon renders, and the download button reports the final file size. Choose how a non-square image maps into the square icon (contain, cover, or stretch), and pick a solid background if you would rather not keep transparency. Everything runs locally — the image is never uploaded to a server.

How to Use

1Drop your PNG onto the upload area (or click to browse). JPG, WebP, and SVG also work; a square, high-resolution source gives the sharpest result.
2Toggle the size presets you want (16, 24, 32, 48, 64, 128, 256) — each one is bundled into the same .ico file.
3Need an unusual size? Set a value with the Custom size stepper and click Add; remove any size from the “Included” list with its × button.
4Pick a Fit mode for non-square images (Contain letterboxes, Cover crops to fill, Stretch distorts) and keep the background transparent or set a solid color.
5Check the live per-size preview, then click “Download .ico” — the button shows the exact file size and saves your favicon.

Key Benefits

Bundles multiple resolutions (16–256px) into one .ico, the way real favicons work
Preserves PNG transparency — the alpha channel survives into the .ico
Add any custom pixel size from 1 up to the 256×256 ICO maximum
Live checkerboard preview of every included size, so you see each icon before you download
Contain / Cover / Stretch fit control for non-square source images
Reports the final .ico file size on the download button
Runs entirely in your browser — the image never leaves your device

Common Use Cases

Creating a favicon.ico for a website from an existing PNG logo
Packaging 16/32/48px icons into one file for a Windows desktop application
Generating a crisp 256×256 icon for high-DPI displays and shortcuts
Converting a transparent brand mark to .ico while keeping its transparency
Producing a single multi-size icon so the browser can pick the right resolution per context

Source image

Click to upload or drag and drop

Accepted: image/png,image/jpeg,image/webp,image/svg+xml • Max 5 MB

PNG recommended (JPG, WebP, SVG also work). A square, high-res image gives the sharpest icons.

Upload an image to get started. Nothing is uploaded to a server — conversion happens entirely in your browser.

Icon sizes

Every selected size is bundled into the one .ico file. Toggle any preset, or add a custom size.

Custom size

Included:16×1632×3248×48

Rendering

Fit (how a non-square image maps to the square icon)

Background

ICO keeps the alpha channel, so transparent PNGs stay transparent — ideal for favicons on any page background.

One .ico, every size

A Windows .ico file can hold several resolutions at once, and the browser or OS picks the best one for each context — a browser tab, a taskbar, a desktop shortcut. Bundling 16×16, 32×32 and 48×48 covers virtually every favicon need; add 256×256 for crisp large displays. Your image is decoded and re-encoded locally with the canvas API and never leaves this page.

Was this tool helpful?

Share Your Experience

Help others discover this tool!

Share on

PNG to ICO Converter

How to Use

Key Benefits

Common Use Cases

Icon sizes

Rendering

One .ico, every size

Was this tool helpful?

Share Your Experience

Related tools

Frequently Asked Questions - PNG to ICO