Modernize a Legacy Icon Set

Long-lived products accumulate icon debt: ICO files that stop at 32 pixels, 256-color palettes, and one-off formats nobody remembers creating. On a modern Windows 10 or 11 desktop those assets render blurry or get upscaled badly. IconWorkshop is well suited to the cleanup because it reads the old formats and writes the new ones.

Audit before you rebuild

1. Open the legacy folder in IconWorkshop's File Explorer and preview the icon-bearing files in place.
2. Sort the set into three buckets: icons with recoverable large artwork, icons whose master files still exist elsewhere, and icons that must be redrawn.
3. Check what each ICO actually contains - the formats view shows which sizes and color depths are present.

Rebuild the families

• Where a master exists (SVG, PSD, or large PNG), regenerate the full modern icon family from it rather than upscaling the old 32-pixel art.
• Where only the old icon exists, keep its best size as the reference and redraw or re-source the artwork before generating the family.
• Use the batch tools to convert and normalize whole folders in one run once the approach is validated on a few samples.
• Target current expectations: ICO families up to 768x768 for Windows 10 and 11, plus alpha PNG derivatives where the product needs them.

Resist the temptation to silently upscale. A sharp 32-pixel icon scaled to 256 pixels looks worse than an honest rebuild, and the audit usually shows that most of the set shares a handful of masters anyway.

Related tutorials

• Batch Create Icon Families from Images
• Manage Icon Assets with Librarian and File Explorer
• Create a Windows ICO from a PNG or PSD