Resize any image to exactly 256×256 pixels. This is the largest standard size in a Windows icon set and a common size for high-resolution favicons and app assets.
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Dimensions fixed to 256 x 256 px for this page.
Scales and crops to fill exact size. No white space. No distortion. Recommended.
Drop image here to resize to 256x256
JPEG, PNG, WebP, AVIF, HEIC. All processing stays in your browser.
If your image is smaller than 256×256 pixels, the tool will upscale it and show a warning before download. For icons and logos, upscaling can soften edges. Where possible, start from a source of 512×512 or larger and resize down for the sharpest result.
256x256 sits at the top of the standard icon size scale, used when an icon needs to look sharp at large display sizes.
Windows app icons
256x256 is the largest size Microsoft recommends including in an app icon set, ensuring Windows only ever scales down on high-DPI displays.
High-resolution favicons
Used inside ICO files for Windows desktop shortcuts and some Progressive Web App manifest icons.
Discord and chat app assets
A common export size for emoji source files and role icons before final compression to platform limits.
Source for smaller icon sizes
256 divides cleanly into 128, 64, 32 and 16, making it a useful master size for generating a complete icon set.
Need a complete favicon package? After resizing your image to 256x256, use the PNG to ICO tool to bundle multiple sizes, including 16x16, 32x32 and 48x48, into a single favicon.ico file with a ready-to-paste HTML snippet.
An ICO file isn't a single image. It's a small container holding several differently sized bitmaps side by side, and Windows picks whichever entry matches the display context instead of scaling one image on the fly. That's why generating a proper 256x256 entry matters even though most everyday icon views, like a taskbar or a small folder thumbnail, are far smaller than that.
Inside that same ICO container, the very small legacy entries, 16x16 and 32x32, are sometimes still stored as classic uncompressed bitmap data for maximum compatibility with old software. The 256x256 entry is typically stored as an embedded PNG instead, since raw uncompressed data at that size would bloat the file considerably. Tools built to generate a complete ICO handle this mix automatically, so there's nothing to configure manually on your end.
If your logo exists as an SVG or as vector shapes in design software, exporting directly at 256x256 sidesteps the upscaling problem entirely, since vector paths render crisp at any size rather than being built from a fixed pixel grid. Keep that vector master file around even after generating your icon set, since future displays or higher-DPI contexts may eventually call for larger sizes than 256x256.
A common source of confusion is that Windows caches icons aggressively, so File Explorer can keep displaying an old icon even after you've swapped in a freshly generated 256x256 file. If your new icon doesn't show up right away, clearing the icon cache or restarting Explorer usually fixes it, rather than anything being wrong with the resized file itself.
256x256 is the largest size in the standard Windows icon set and is especially important on high-DPI monitors, where the operating system displays desktop icons at very large sizes. Including a 256x256 version in your icon file ensures Windows scales the icon down for smaller contexts rather than scaling a small icon up, which would look blurry. Most icon guidelines recommend 16, 32, 48 and 256 pixels as the minimum complete set.
If your image is smaller than 256x256 pixels, this tool will upscale it to fit and a warning will appear before you download. For icons specifically, upscaling a small logo can make edges look soft or pixelated. If your source artwork is small, it is best to start from a vector file (SVG) or a larger PNG, ideally 512x512 or larger, and resize down to 256x256 rather than up.
256x256 is one of several sizes used inside a favicon.ico file, alongside smaller sizes like 16x16, 32x32 and 48x48. Browser tabs use the small sizes, while 256x256 is used for high-resolution contexts such as Windows desktop shortcuts and some PWA icons. If you need a complete favicon package with multiple sizes bundled together, use the PNG to ICO tool after resizing your source image here.
