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Convert PNG to ICO
ICO is the format browsers request for a website's favicon and Windows uses for application icons — contexts that specifically demand a .
How to convert PNG to ICO
Drop your PNG files onto the panel above and press Convert. A whole folder at once is fine, and the ICO files download individually or as a single ZIP.
There is no quality setting, because every icon size is packed losslessly from your image. The result is one file containing all the standard sizes, which is what a browser expects when it asks for a favicon.
Nothing is uploaded. The decoders and encoders run as WebAssembly inside this page, which is why there is no file-size limit, no queue, and no copy of your image on anyone's server.
Why convert PNG to ICO?
ICO is the format browsers request for a website's favicon and Windows uses for application icons — contexts that specifically demand a .ico file rather than a PNG.
Converting packs your image into a multi-size icon: 16, 32, 48, up to 256 pixels in one file, so every context (browser tab, bookmark bar, desktop shortcut, high-DPI display) picks the size it needs.
| PNG | ICO | |
|---|---|---|
| Compression | Lossless | Container — entries here are PNG-compressed (lossless) |
| Transparency | Yes, full alpha channel | Yes, full alpha channel |
| Animation | No (APNG exists but is rarely used) | No |
| Support | Universal | Universal where icons are expected: favicons, Windows |
| Best for | Logos, icons, screenshots, diagrams, anything needing transparency | Favicons and Windows app icons |
What ICO does to file size
The ICO holds several sizes of the image at once, but each entry is PNG-compressed, so a typical logo lands in the tens of kilobytes — small enough for the favicon request every visitor's browser makes.
Start from a square image — icons are displayed square, and a non-square source is fitted, not stretched. Detail that reads well at full size vanishes at 16 pixels, so simple, bold shapes make the best favicons.
Frequently asked questions
How do I convert PNG to ICO?
Drop your PNG files above, choose ICO as the output, and press Convert. The files are decoded and re-encoded at maximum quality inside your browser, then download individually or as a ZIP — no upload, no account, no watermark.
Which icon sizes are included?
The standard ladder from 16 to 256 pixels, each entry PNG-compressed inside the one .ico file. That covers browser tabs (16, 32), desktop shortcuts and taskbars (48, 64), and high-DPI displays (128, 256) without any further configuration — link the single file in your HTML head and you are done.
Does converting PNG to ICO lose quality?
No. Each size inside the icon is stored PNG-compressed, which is lossless — the image is scaled down to each icon size and stored exactly. Start from a square image — icons are displayed square, and a non-square source is fitted, not stretched. Detail that reads well at full size vanishes at 16 pixels, so simple, bold shapes make the best favicons.
Can I just rename the file to .ico?
No. An ICO is a container with its own directory structure holding multiple image sizes — a renamed PNG is not a valid icon file, and Windows and some browsers will refuse it. A real conversion builds that structure, which is what happens here.
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