Convert PNG to ICO — Offline
Drop one or more PNG files onto MiniMax Converter and get a proper Windows .ico — a single icon file with multiple resolutions embedded (16, 24, 32, 48, 64, 128, 256 px). Ideal for app icons and favicons. Runs locally: no upload, no file-size limit, no watermark.
How to convert
- Drop your PNG file (or a whole folder of PNGs) onto the MiniMax Converter window.
- In the format chooser, pick ICO as the output format.
- Choose the size set: PC sizes (16–256 px) for a Windows app icon, or Favicon for a website — sizes larger than your source are skipped so nothing is upscaled.
- Save the .ico next to your original; for the favicon path it's named favicon.ico, ready to drop at your site root.
Real multi-resolution icons, not a renamed PNG
MiniMax builds a true Windows .ico using Pillow, embedding several square resolutions in one file (16, 24, 32, 48, 64, 128, 256 px) so Windows can pick the right one for the taskbar, desktop, or title bar. The conversion is lossless — each size is stored as full pixel data, and transparency from your PNG is preserved. For the sharpest result, start from a square PNG at 256×256 or larger.
App icons and favicons in one pass
Use the PC sizes option for a Windows application icon, or the Favicon option to produce a favicon.ico you can drop straight at your website root. Sizes bigger than your source image are automatically skipped so the icon is never blurrily upscaled. Drop a folder of PNGs and they all convert in one go.
Why offline?
Online PNG-to-ICO converters make you upload each image, often cap file sizes, and may add ads, queues, or tracking. MiniMax converts entirely on your machine — your artwork and logos never leave your computer, there's no size limit, and there's no watermark. It runs at local SSD speed and works with no internet connection.
Questions and answers
Will the .ico contain multiple sizes, or just one?
Multiple. The PC option embeds 16, 24, 32, 48, 64, 128 and 256 px in a single .ico, so Windows shows a crisp icon at any display size. Sizes larger than your source PNG are skipped to avoid upscaling.
Does it keep PNG transparency?
Yes. The alpha channel is preserved, so transparent corners and rounded edges stay transparent in the resulting icon and favicon.
What source size should I start from?
A square PNG of 256×256 or larger is best — it lets every standard size be embedded sharply. Smaller sources still work, but only the sizes up to your image's resolution are included.
Can I make a favicon.ico for my website?
Yes. Choose the Favicon option and you get a favicon.ico with the standard web sizes embedded, named ready to place at your site root. You can also batch-convert a folder of PNGs at once.
Related tools
Get MiniMax Converter
Cross-platform desktop app. Linux free for non-commercial use; Windows & macOS one-time €20 license. No subscription, no telemetry, no account.