Convert PBM to ICO

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What happens when you convert PBM to ICO?

Multiple source images

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

No new colour information

The source stores grayscale or bitonal values. A colour-capable ICO can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.

Icon packaging

Creates one square icon. The image is fitted inside it without stretching.

Encoding mode

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. The output uses the implemented still-image encoder; file size depends on the pixels and format.

PBM

Source

PBM

Portable Bitmap

Compression: UncompressedTransparency: NoMetadata: Header, Comments

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

Explore PBM format →

ICO

Target

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.

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Is PBM → ICO right for you?

Good choice when

ICO fits your delivery use: Application icons & favicons.
You can choose the source image or part needed for delivery.
You need the existing gray or binary image in a compatible delivery format.
You need an icon resource for a compatible application.
You need a ICO-compatible workflow that can hold transparency added in a separate edit.

Probably not when

You require a complete collection, page set or multipart round trip.
You expect automatic colourisation or reconstruction of absent tones.
You need automatic icon design or guaranteed multi-size packaging.
You need a guaranteed output file size or archival pixel equality. Encoder settings do not guarantee either.
You expect automatic background removal or transparency.

PBM to ICO conversion details

Multiple source images: Only one image is decoded; a concatenated image sequence is not exported as a complete set.
No new colour information: The source stores grayscale or bitonal values. A colour-capable ICO can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.
Icon packaging: Creates one square icon. The image is fitted inside it without stretching.
Transparency: The target can store an alpha channel, but converting an opaque image does not create transparent areas. Removing a background is a separate editing step.
Encoding mode: 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. The output uses the implemented still-image encoder; file size depends on the pixels and format.
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: PBM: Uncompressed → ICO: Depends on variant PBM: 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. 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.
Transparency: Transparency is replaced with white by default. Change the background in Advanced options.
Colour depth: PBM: 1 bit/pixel
Multiple images: ICO: Alternative icon sizes
Dimensions: Creates one square icon. The image is fitted inside it without stretching.
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.

Can conversion restore colour or missing shades?

Will ICO automatically create all icon sizes?

Creates one square icon. The image is fitted inside it without stretching.

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?