Create real multi-image ICO, six PNG icon sizes and editable HTML references from one image.
Your input
Outputs are cleared when the input changes.
Result
Enter your data or use the example, then run the tool.
Worked example
A 1000 × 800 sample is fitted into square icons. The ICO holds 16 × 16, 32 × 32 and 48 × 48 PNG entries; separate PNGs also include 180, 192 and 512 pixels.
Method
Preserve the source aspect ratio while drawing six transparent PNGs. A real ICO directory records dimensions, byte lengths and offsets for three PNG images. Download the HTML references and edit them for your site paths.
Limits
PNG-compressed ICO entries target modern icon readers, not every legacy browser or Windows version. Small inputs are enlarged for larger PNG sizes. Creating icons does not install a PWA, service worker or web manifest. Input limit: 20 MiB and 40 million pixels.
Your inputs stay on this device. Only optional, consented page visits are measured. Input values, files, filenames and processing logs are not sent to Analytics.
When switching languages, text, settings and selected files are temporarily kept on this device. Transfers are removed after restoring; interrupted transfers are cleaned up on a later visit. Inputs and files are never uploaded.