How to Convert ICO to PGM

PGM (Portable Graymap) is part of the Netpbm family and stores grayscale image data at 8 bits per pixel, with no color channels at all. Converting a color ICO file to PGM strips out all color information, leaving only the grayscale luminance values for each pixel — relevant when an icon design needs to feed into a research tool or computer vision pipeline that specifically expects the PGM format.

This is an unusual pairing in practice, since icon design and grayscale research pipelines serve very different purposes, but the conversion itself is a straightforward decode-and-desaturate step.

1. Install Turbo Batch Image Converter Pro on your Windows PC.
2. Open the app and select Batch Mode for multiple files, or Individual Mode for a single ICO.
3. Drag your ICO file or folder into the app window, enabling recursive folder scanning if needed.
4. Set the "From" format to ICO and the "To" format to PGM.
5. Click Convert. PGM files are written to the output folder, fully offline.

• 100% offline — your icon and logo files are never uploaded anywhere
• Produces standard PGM files compatible with Netpbm-based research and processing tools
• Bulk conversion of entire folders, including sub-folders, in one click
• Multi-core processing for fast handling of large batches
• Option to delete original ICO files automatically after conversion
• No recurring subscription or hidden upload limits