Free online FITS-to-ICO converter — upload a FITS file and download a ICO. Fast, private, no signup.
Drag and drop your FITS into the converter above, or click to choose it. Large files upload straight to storage with a progress bar — and we detect the real format from the file's bytes, so even a mislabeled file works.
ICO is already selected as the target. Any options that apply to a ICO — quality, resize, rotate and more — appear automatically; tweak them or leave the defaults, then start the conversion.
Your ICO is ready in seconds. Download it, inspect or strip its metadata, or share it with a private link — your choice.
Drop your FITS file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a ICO to download. No software to install.
Yes. Convert FITS to ICO for free right in your browser, with no account needed to get started.
Your file is transferred over an encrypted connection and anonymous uploads are temporary. You can also view and strip metadata (location, device, author) before you download.
FITS — the Flexible Image Transport System used in astronomy; convert-from only. Windows icon container holding several sizes.
Convert FITS to: JPG · PNG · WEBP · GIF · HEIC · AVIF · TIFF · APNG · BMP · DDS
Convert to ICO from: APNG · AVIF · BMP · CUR · DDS · DPX · EPS · EXR · GIF · HDR