Processed locally in your browser — nothing is uploaded.
ICO Generator
Quick answer
Convert a PNG or JPG into a genuine multi-resolution Windows .ico file, the format Windows itself expects for application icons, desktop shortcuts, and file-type associations.
What the ico generator does
An .ico file is not a single image; it is a container that bundles several versions of the same icon at different pixel sizes, and sometimes different color depths, into one file. Windows opens that container and picks whichever size fits the context it is drawing the icon in, rather than scaling one image up or down on the fly.
This tool takes one source PNG or JPG and packs it into that container at multiple sizes: 16 pixels for the taskbar and file list views, 32 pixels for standard desktop icons and the Windows Explorer details pane, 48 pixels for larger icon views, and 256 pixels for jumbo icons and thumbnail previews on modern Windows. Bundling all of them into one .ico means the same file looks sharp whether it shows up tiny in a list or large on the desktop.
Source quality still matters even though the container handles multiple sizes. A blurry or heavily compressed JPG produces a blurry 256-pixel icon no matter how well it is packed, and a photograph with lots of fine detail tends to look muddy once shrunk down to 16 pixels for the taskbar. A clean, high-resolution source with simple, bold shapes converts far better across the whole size range than a busy photo does.
How to use it
Upload a PNG or JPG
Use a square, high-resolution source for the cleanest result at every packed size.
Select which sizes to include
Pick from the standard Windows sizes, or include the full range if you are not sure which contexts the icon will appear in.
Preview the packed icon
Check how the image looks at the smallest included size, since that is where detail loss is most visible.
Download the .ico file
Save the finished container ready to use as an application icon, shortcut icon, or file association.
Your images never leave your device
Developers packaging an internal desktop tool, or a small studio building an installer for software that has not shipped yet, both need an .ico file before the project is public. Since the packing happens entirely in your browser, an unreleased application icon never has to be uploaded anywhere to get bundled into the right container format.
- No file is ever uploaded to a server
- Works offline after the first visit
- No account, no watermark, no limits
Format and quality tips
Match sizes to where the icon will actually appear
If the icon is only ever going to sit in a taskbar or a small toolbar button, including the huge 256-pixel size adds unnecessary file weight. If it is a full application icon that Windows will show at jumbo thumbnail size in Explorer, leaving out 256 pixels makes that view look blurry.
Design for a flat background
Windows renders .ico transparency correctly in modern versions, but a fully transparent edge can still look harsh against certain desktop themes. A subtle border or a deliberate flat background color at the smallest sizes often reads more cleanly than a hard transparent cutout.
Frequently asked questions
What is actually inside an .ico file?
It is a container holding multiple images of the same icon at different pixel sizes, sometimes at different color depths, so Windows can pick the right one for the context instead of scaling a single image.
What icon size does Windows use for the taskbar?
16 pixels is the small size used in taskbars and list views; 32 pixels covers standard desktop icons, and 256 pixels is used for jumbo icon view and Explorer thumbnail previews.
Can I convert a JPG directly to .ico?
Yes, JPG is accepted as a source, though a PNG source with clean edges and no compression artifacts generally packs into a sharper icon than a JPG that already has some blur baked in.
Why does my icon look fine at 256 pixels but blurry in the taskbar?
Small icon sizes have very little room for detail; fine lines, gradients or thin text that read clearly at 256 pixels often collapse into a smudge at 16 pixels regardless of source quality.
Is .ico the same as .png with a different extension?
No. A PNG holds exactly one image; an .ico is a container format that bundles several images and metadata about their sizes together, which is why Windows specifically requires it for icon files rather than accepting a plain PNG.
Do I need every size, or just one?
Including the standard set (16, 32, 48 and 256) covers the contexts Windows actually uses; a single-size .ico still works but looks scaled and soft anywhere Windows needed a different size than the one you provided.
Further reading
- How to Watermark Photos: A Practical GuideA watermark buys you attribution and friction, not protection. Here is how to place, size and batch one so it actually reads — and an honest look at what metadata credit can and cannot do.6 min read
- How to Blur Faces and Redact Photos ProperlyA blur only protects you if the hidden pixels are gone from the exported file — and if the blur is strong enough that nobody can rebuild what was under it. Here is how to get both right.7 min read
- Favicon Sizes and Formats: A Complete GuideYou need fewer favicon sizes than most generators produce, but the ones you need are specific. Here is what each size is for, the exact HTML and manifest, and why a full logo turns to mush.6 min read