Multiple source images
Only one image is decoded; a concatenated image sequence is not exported as a complete set.
Convert PGM to PNG
- In your browser
- No upload
- Private by design
What happens when you convert PGM to PNG?
No new colour information
The source stores grayscale or bitonal values. A colour-capable PNG can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.
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.
Lossless sample storage
PNG compression is lossless. Palette conversion, resizing or reducing bit depth before encoding can still discard information. Animation is the APNG extension included in the third edition. PNG 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.
PGM
Source
PGM
Portable Graymap
Compression: UncompressedTransparency: NoMetadata: Header, Comments
Portable Graymap: simple uncompressed raster samples for image-processing pipelines.
Explore PGM format →PNG
Target
PNG
Portable Network Graphics
Compression: LosslessTransparency: YesMetadata: Exif, ICC, Text
Lossless raster images with precise edges and optional transparency. The PNG standard also defines APNG animation.
Explore PNG format →Is PGM → PNG right for you?
Good choice when
- PNG fits your delivery use: Screenshots & transparent graphics.
- 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 lossless storage of the rendered samples supported by PNG.
- You need a PNG-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 expect lossless encoding to restore lost details or editing structure.
- You require identical samples without a defined colour and precision policy.
- You expect automatic background removal or transparency.
PGM to PNG 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 PNG can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.
- 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.
- Lossless sample storage
- PNG compression is lossless. Palette conversion, resizing or reducing bit depth before encoding can still discard information. Animation is the APNG extension included in the third edition. PNG 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
- PGM: Uncompressed → PNG: Lossless 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. PNG: PNG compression is lossless. Palette conversion, resizing or reducing bit depth before encoding can still discard information. Animation is the APNG extension included in the third edition.
- Transparency
- Transparency is replaced with white by default. Change the background in Advanced options.
- Animation
- Still image output. Animated files use only the first frame; animation is not preserved.
- Colour depth
- PGM: maxval up to 65535 → PNG: 1–16 bits/sample
- HDR
- PNG: Third-edition signalling
- 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.
Can conversion restore colour or missing shades?
The source stores grayscale or bitonal values. A colour-capable PNG can represent these tones, but conversion cannot infer original scene colours or recover missing intermediate shades. Colourisation would be a separate image-editing operation.
Will the background become transparent?
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.
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?
Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.