Convert ICO to PGM

In your browser
No upload
Private by design

What happens when you convert ICO to PGM?

Multiple source images

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

Grayscale output

Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.

Opaque output

Transparency is replaced with white by default. Change the background in Advanced options.

Lossless sample storage

Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning. PGM can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.

ICO

Source

ICO

Windows Icon

Compression: Depends on variantTransparency: YesMetadata: Image dimensions, Colour depth

An icon resource containing several raster sizes and colour depths, with masks or alpha for transparency.

Explore ICO format →

PGM

Target

PGM

Portable Graymap

Compression: UncompressedTransparency: NoMetadata: Header, Comments

Portable Graymap: simple uncompressed raster samples for image-processing pipelines.

Explore PGM format →

Is ICO → PGM right for you?

Good choice when

PGM fits your delivery use: Grayscale images & masks.
You can choose the source image or part needed for delivery.
Your processing pipeline explicitly needs grayscale samples.
An opaque image is acceptable for your destination.

Probably not when

You require a complete collection, page set or multipart round trip.
Colour distinctions carry information you need to retain.
You need cutouts or translucent edges for compositing.
You expect lossless encoding to restore lost details or editing structure.

Conversion considerations

ICO can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
PGM stores one grayscale sample per pixel, with no colour channels or alpha. Colour input becomes gray; brightness depends on the colour transform and transfer-function handling chosen by the future engine. Higher maxval can retain more gray levels, but does not retain chromatic information.
If ICO contains transparency, PGM cannot retain it as transparent output areas. Those pixels need compositing against an opaque background. Matte colour, alpha interpretation and edge treatment are future engine decisions; no background colour is selected yet.

ICO to PGM conversion details

Multiple source images: Only one image is decoded; a concatenated image sequence is not exported as a complete set.
Grayscale output: Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.
Opaque output: Transparency is replaced with white by default. Change the background in Advanced options.
Lossless sample storage: Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning. PGM can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.
Sample precision & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Metadata & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Compression: ICO: Depends on variant → PGM: Uncompressed ICO: ICO compression depends on the embedded image payload. Multiple sizes are alternatives, not animation frames; transparency handling differs between old masks and alpha-capable images. PGM: Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning.
Transparency: Transparency is replaced with white by default. Change the background in Advanced options.
Colour depth: PGM: maxval up to 65535
Multiple images: ICO: Alternative icon sizes
Dimensions: Rendered image dimensions are retained within the converter limits; this tool does not offer resizing. Orientation handling depends on the source decoder.
Metadata: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Common questions

Will every source image be exported?

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

Will PGM keep the source colours?

Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.

What happens to transparent areas?

Transparency is replaced with white by default. Change the background in Advanced options.

Are bit depth and colour values guaranteed to match?

Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Will metadata and colour profiles be retained?