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PNG to ICO Converter
PNG
ICO
Convert up to 5 PNG images to ICO — drag, drop, download.
Drop PNG images here
or click to browse · up to 5 files · max 20 MB each
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Each file is also available individually above.
About PNG → ICO conversion
What is PNG?
PNG is a lossless image format that supports full transparency (alpha channel). Every pixel is preserved exactly, making it the preferred choice for logos, UI graphics, screenshots, and any image with sharp edges or flat areas of colour.
What is ICO?
ICO is the image format used for website favicons and Windows application icons. A single ICO file can contain multiple image sizes so the OS or browser picks the best fit automatically.
About PNG
PNG (Portable Network Graphics) was created in 1996 as a patent-free, lossless replacement for the GIF format. It stores every pixel with perfect accuracy — no compression artifacts, no quality degradation on re-save — making it the standard for logos, icons, UI screenshots, charts, diagrams, and any image where pixel-perfect fidelity is more important than file size.
Transparency support
PNG supports full alpha channel transparency, meaning each pixel can range from fully opaque to fully transparent (with all gradations in between). This lets logos and icons sit cleanly on any background color without a white box or halo around the edges. JPEG has no transparency support at all; for any web image that needs a transparent background, PNG is the standard choice. WEBP and AVIF also support transparency, with smaller file sizes — but PNG remains the most universally compatible transparent-background format.
Lossless compression
PNG uses DEFLATE, a lossless compression algorithm. Every save produces bit-for-bit identical output, and no detail is ever discarded. For images with large flat areas of color, sharp geometric edges, and text, PNG compression is very efficient — a flat-color logo in PNG is often smaller than the same image as a maximum-quality JPEG. For photographs with complex color gradients, PNG files are large because lossless compression cannot discard the tonal variation; JPEG or WEBP is a better choice for photographic content.
PNG on the web
All browsers support PNG natively. It is the correct format for screenshots, UI mockups, logos, icons, product diagrams, and any image that must remain crisp and color-accurate after export. For web delivery where file size matters and transparency is not required, WEBP offers 25–35% smaller files. For transparent images on modern browsers, WEBP or AVIF are more efficient alternatives — but PNG remains the universal fallback that works in every context, including email, desktop software, and print production workflows.
Frequently asked questions
Is this converter free?
Yes — completely free with no account required. No watermarks are added to your converted files, and no subscription is needed.
How do I convert PNG to ICO?
Drop your PNG images into the upload zone (or click Choose files). Adjust the quality slider if needed, then click Convert all to ICO. Once done, download each file individually or click Download all (ZIP) for the full batch.
How many files can I convert at once?
Up to 5 images per batch, maximum 20 MB per file. All images in your queue are converted in parallel. Start a new batch to process more.
Are my images stored after conversion?
Converted files are held on the server only long enough for download, then automatically deleted. No images are retained beyond your session.
ICO (Icon) is the container format Windows uses for application icons, taskbar icons, system UI icons, and the favicon.ico file that browsers display in address bars, browser tabs, and bookmark lists. A single ICO file can hold multiple images at different resolutions inside one container — 16×16 for browser tabs, 32×32 for taskbars, 48×48 for Explorer file listings, and 256×256 for high-DPI desktops and notification center entries. The OS or browser picks the right size for the context. Converting a PNG to ICO is the standard step for any web developer, desktop application developer, or icon designer who has a design as a PNG raster file and needs it in the Windows icon format or browser favicon format.
The AT USE PNG to ICO Converter processes the conversion server-side using ImageMagick. Upload a PNG up to 20 MB and download a single-frame ICO at the same resolution as the input. Both files are deleted from the server immediately after download. No account required, no watermarks.
Favicon.ico and modern browsers
Every major browser — Chrome, Firefox, Safari, and Edge — can use a PNG referenced via <link rel="icon" href="icon.png"> in the page head. Browsers also look for favicon.ico at the domain root as a fallback when no <link> tag is present. RSS readers, bookmark managers, password managers, and some screen readers use favicon.ico at the root and do not read the <link> tag at all. Placing a favicon.ico at the root covers these contexts without requiring a <link> declaration in every page's <head>.
The recommended setup is a 32×32 PNG converted to ICO placed at the domain root, plus a <link rel="icon"> tag pointing to a separate PNG at 192×192 for modern browsers and a 180×180 PNG for the Apple touch icon. The ICO provides the legacy fallback; the PNG links provide the high-quality modern presentation on devices that read them.
Single-frame vs multi-resolution ICO
A single-frame ICO holds one image at one resolution — the resolution of the input PNG. Multi-resolution ICO files pack 16×16, 32×32, 48×48, and 256×256 versions of the same icon into one file so Windows can select the cleanest version for each display context: file Explorer listings, the taskbar, the desktop, and high-DPI application switchers each request different sizes. This converter produces a single-frame ICO. For browser favicon use, a single-frame 32×32 ICO is sufficient — browsers scale it to fit the tab. For Windows desktop application icons, multi-resolution ICO files are preferred; produce them by converting each PNG size separately and merging with a dedicated ICO packaging tool or compiler (such as ResourceHacker or a build-time icon tool in your IDE).
Transparency in ICO output
ICO files produced from PNG sources with an alpha channel store the transparency as a 32-bit RGBA image with per-pixel alpha values. Modern Windows versions and all current browsers render 32-bit ICO transparency correctly. The full alpha channel is preserved through the conversion — a PNG logo on a transparent background becomes an ICO that sits cleanly on any browser tab color, taskbar theme, or Windows desktop background without a white box or halo artifact.
When to convert PNG to ICO
- Creating a favicon.ico for a website or web application: A web developer finishes a logo in Figma and exports it as a 32×32 PNG. Converting to ICO and uploading it to the domain root as favicon.ico ensures the browser tab icon appears in older browsers, RSS readers, and bookmark managers that look for favicon.ico at the root rather than reading a link rel="icon" tag. A separate high-resolution PNG linked in the head handles the modern high-DPI presentation.
- Packaging an icon for a Windows desktop application: An Electron developer building a cross-platform desktop application needs a Windows-compatible icon file. The application icon path specified in the Electron builder configuration requires ICO format for the Windows installer, taskbar button, and file association entry. Converting the app's 256×256 PNG logo to ICO produces the file that Windows uses in the Start menu, task switcher, and file Explorer listing.
- Creating a browser extension icon: Chrome, Firefox, and Edge extensions declare icons in manifest.json. The manifest accepts PNG for most icon fields, but some legacy build workflows and extension packaging pipelines require ICO. Converting the source PNG the designer produced to ICO gives the extension developer the format the build system needs without opening a dedicated icon editor or installing conversion software locally.
- Windows screensaver and system tool icon packaging: System utilities, screensavers, installer packages, and Windows service applications use ICO for their system tray icons, Control Panel applet appearances, and executable file icons visible in File Explorer. A developer building a Windows system tool converts their PNG logo to ICO during the pre-distribution packaging step before compiling or wrapping with NSIS, Inno Setup, or WiX Toolset.
PNG to ICO — frequently asked questions
What PNG size should I use when creating a favicon?
32×32 pixels covers the most contexts: browser tabs on standard and high-DPI displays, bookmarks, and legacy favicon.ico fallback lookups. For a favicon.ico, resize your PNG to 32×32 before converting. For the separate high-resolution icon linked via link rel="icon", a 192×192 PNG is a good base that scales cleanly on any device.
Can this converter produce a multi-resolution ICO with several sizes in one file?
No. This converter produces a single-frame ICO at the resolution of the input PNG. A multi-resolution ICO containing 16×16, 32×32, 48×48, and 256×256 frames in one file requires a dedicated multi-frame ICO builder. Convert each PNG size separately, then merge them with a multi-frame ICO tool such as ResourceHacker, or use a build-time icon tool in your IDE or application build pipeline.
Does transparency in my PNG survive the ICO conversion?
Yes. A 32-bit RGBA PNG with an alpha channel produces a 32-bit ICO with per-pixel alpha transparency. Modern Windows versions (Vista and later) and all current browsers (Chrome, Firefox, Safari, Edge) render 32-bit ICO transparency correctly — the icon sits cleanly on any background without a white box or halo artifact.
Will the favicon appear on iPhone and Android home screen shortcuts?
ICO is a Windows-specific format. iPhone home screen shortcuts require a 180×180 PNG declared via link rel="apple-touch-icon". Android PWA shortcuts use the web manifest icons array, which also expects PNG. For home screen icons on mobile platforms, produce PNG files at the correct dimensions separately — ICO is not used by Apple or Android home screen rendering.
Is this tool free?
Yes. No account required, no watermark on the output, no usage cap beyond the 20 MB per-file technical limit.
Also see: ICO to PNG, SVG to PNG, Compress Image.
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