ICO to PGM Converter

Fast online ICO to PGM converter — no install needed

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Beyond Icons

Extract the artwork from ICO containers and convert to PGM — making your icon imagery usable in design projects, documents, and web content.

Secure Conversion

All ICO to PGM processing happens over encrypted connections. Uploaded files are purged immediately, converted files within 24 hours.

Server-Side Power

The conversion from ICO to PGM executes on cloud infrastructure — no CPU drain on your computer, phone, or tablet during processing.

How to convert ICO to PGM

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose pgm or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your pgm file right afterwards

About formats

ICO is the icon file format for Microsoft Windows), introduced with Windows 1.0 in 1985 and serving as the standard container for application icons, file type icons, and shortcut icons throughout the Windows ecosystem. An ICO file bundles multiple image variants within a single container — each at different sizes (16x16, 32x32, 48x48, 256x256, and others) and color depths (4-bit, 8-bit, 24-bit, 32-bit with alpha) — allowing Windows to select the most appropriate image for each display context, from tiny taskbar buttons to large desktop icons. The container structure consists of an ICONDIR header, an array of ICONDIRENTRY records describing each variant, and the image data itself. Since Windows Vista, ICO files support embedded PNG-compressed images for the larger sizes (typically 256x256), dramatically reducing file size while maintaining quality with full alpha transparency. One advantage is automatic size adaptation — Windows pulls the optimal resolution from the ICO container for each context (Explorer list view, desktop tile, Alt-Tab preview), ensuring crisp display without the application managing separate image files. The format's operating system-level integration is another core strength: ICO files serve as the identity mechanism for executables, file associations, and shortcuts across all Windows versions, and web browsers use favicon.ico for website identity in tabs and bookmarks. ICO creation and editing is supported by image editors like GIMP, Inkscape, and dedicated icon tools, and the format remains essential for Windows application development.
Developer: Microsoft
Initial release: 1985
PGM (Portable Graymap) is the grayscale member of the Netpbm image format family, created by Jef Poskanzer in 1988 as part of the Pbmplus toolkit for Unix systems. PGM stores single-channel intensity images where each pixel holds a gray value from 0 (black) to a user-specified maximum (typically 255 for 8-bit or 65535 for 16-bit). The format exists in ASCII (magic number P2), where pixel values are written as decimal text numbers separated by whitespace, and binary (magic number P5), where values are stored as raw bytes. Both variants begin with a header specifying the magic number, width, height, and maximum gray value. PGM was designed as the grayscale intermediate in Netpbm's convert-process-convert pipeline philosophy: source images from any format are converted to PGM, processed using Netpbm's extensive command-line tool library, then converted to the target format. One advantage is format transparency — the ASCII variant makes image data directly readable by humans and trivially processable by text tools like awk and grep, invaluable for debugging and education. The scientific and computer vision community's adoption is another strength: PGM's straightforward single-channel representation makes it a natural format for image analysis algorithms, and many academic papers and course materials use PGM examples. The format is supported by ImageMagick, GIMP, and countless image processing libraries, and remains standard input for many research tools and benchmarks.
Developer: Jef Poskanzer
Initial release: 1988

Frequently Asked Questions

Why convert ICO to PGM?

PGM converts your icon to a portable grayscale image — used in image analysis, computer vision preprocessing, and scientific computing workflows.

What programs open PGM files?

Common options include GIMP, Netpbm tools, IrfanView, XV viewer. The format has good support across major operating systems.

Can I convert ICO to PGM for free?

Yes — Convertio offers free ICO to PGM conversion. For professional volumes and larger files, premium plans provide expanded limits and priority processing.

Does this work on mobile devices?

Yes — the ICO to PGM converter works in any mobile browser on iOS and Android. No app installation is needed — just open convertio.co and upload your file.

Does ICO to PGM keep transparency?

If PGM supports transparency (like PNG or WEBP), the alpha channel from your ICO is preserved. Formats without transparency support fill with a solid background.

What happens to my uploaded files?

Your ICO files are automatically deleted right after conversion. The resulting PGM files remain available for download for 24 hours, then they are permanently removed.

ICO to PGM Quality Rating

5.0 (4 votes)
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