HEIF to PGM converter

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What happens when you convert HEIF to PGM?

Multiple source images

Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.

Animation becomes a still

Still image output. Animated files use only the first frame; animation is not preserved.

Grayscale output

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

Lossless sample storage

HEIF

Source

HEIF

High Efficiency Image File Format

Compression: Depends on variantTransparency: YesMetadata: Exif, XMP, ICC, NCLX

An image container for individual pictures, collections and sequences. The codec inside determines compression.

Explore HEIF 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 HEIF → 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.
You want a still illustration from an animated source.
Your processing pipeline explicitly needs grayscale samples.

Probably not when

You require a complete collection, page set or multipart round trip.
Motion, frame timing or loop behaviour must survive.
Colour distinctions carry information you need to retain.
You need the original HDR range for relighting or grading.

Conversion considerations

HEIF 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.
An animated HEIF has a timed sequence; PGM is a still-image destination in this workflow. A still export loses motion and timing. Frame choice, blending and disposal must be defined by the future engine; a first-frame export is not promised.
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 HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.
If HEIF 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.

HEIF to PGM conversion details

Multiple source images: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Animation becomes a still: Still image output. Animated files use only the first frame; animation is not preserved.
Grayscale output: Colour is converted to grayscale using linear-sRGB luminance and the sRGB transfer curve. Colour channels and transparency are not retained.
HDR to SDR: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Opaque output: Transparency is replaced with white by default. Change the background in Advanced options.
Lossless sample storage: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Sample precision & colour: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Metadata & colour: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Compression: HEIF: Depends on variant → PGM: Uncompressed HEIF: HEIF defines the container. Compression may be lossy, lossless or uncompressed depending on its codec binding; one global quality or bit-depth value would be misleading. 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: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported.
Animation: Still image output. Animated files use only the first frame; animation is not preserved.
Colour depth: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported.
HDR: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported. Availability is checked on this device using native WebCodecs.
Multiple images: Primary SDR still image only. sRGB/Display P3 and supported 8/10-bit HEVC render to 8-bit sRGB. HDR, auxiliary alpha and other HEIF codecs are rejected. Thumbnails, depth, gain maps and Live Photo motion are not exported.
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?

Will the output keep animation?

Still image output. Animated files use only the first frame; animation is not preserved.

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.

Are bit depth and colour values guaranteed to match?

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.

HEIF to PGM converter

Drop a HEIF file here

What happens when you convert HEIF to PGM?

Multiple source images

Animation becomes a still

Grayscale output

Lossless sample storage

HEIF

PGM

Is HEIF → PGM right for you?

Good choice when

Probably not when

HEIF to PGM conversion details

Common questions

Related conversions

Other targets for HEIF

Other sources for PGM