How the ICO & CUR Converter works
Create Windows ICO icons, website favicon packs and CUR cursor files from images entirely in your browser. Export ICO/CUR back to PNG/WebP and other rasters. Preview the crop and download without uploading the source artwork.
A good ICO file contains several image sizes so Windows and browsers can choose a sharp version for each context. Fluxed can package common favicon and application sizes into one ICO, or build a favicon PNG pack (16–512 plus Apple touch) with HTML and webmanifest. CUR output also stores the cursor hotspot. ICO/CUR inputs can be decoded and exported as standard raster images. Processing runs locally with browser image APIs and a purpose-built encoder.
Popular conversions
PNG to ICO
JPG to ICO
WebP to ICO
PNG to CUR
Favicon pack
ICO to PNG
Why local browser processing is safer
Traditional cloud converters upload a file to a remote system before processing it. Fluxed instead uses browser APIs, Web Workers and WebAssembly (WASM) inside the browser sandbox. Your operating system gives the page access only to files you explicitly select, and the conversion output is created locally. There is no account, analytics script or tracking cookie. After the required app assets have been cached, supported workflows can also run offline.
Frequently asked questions
Which sizes should an ICO include?
For broad use include 16, 32, 48, 64, 128 and 256 pixel variants; a website favicon may need fewer.
Does ICO support transparency?
Yes. Transparent pixels can be preserved when the source image includes an alpha channel.
Is my logo uploaded?
No. Previewing, resizing and ICO or CUR generation take place in your browser.
Related private tools