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PGM File Format

Portable Graymap category

PGM is netpbm's grayscale format — 8 or 16-bit samples, ASCII or binary, zero compression. Computer-vision research and image-processing courses live on it.

Typical use: Convert PGM grayscale to PNG/JPG for viewing, or emit PGM for scientific pipelines that require raw pixel honesty.

About the PGM format

PGM is netpbm's grayscale format: a two-line text header, then raw 8 or 16-bit luminance samples with no compression and no metadata. That raw honesty made it the default exchange format of computer-vision research, image-processing coursework and any pipeline where "what you read is exactly the pixel value" matters.

Converting PGM to PNG or JPG just normalizes it for humans; converting back down preserves every value bit-exactly when the pipeline needs numbers, not pictures.

Strengths

  • ✓ Bit-exact pixel values, no color management surprises
  • ✓ 16-bit depth support
  • ✓ Trivially parseable

Limitations

  • ✗ No compression — large files
  • ✗ Grayscale only
  • ✗ No embedded metadata
Structure
P2 (ASCII) / P5 (binary) header + samples
Types / schema
8/16-bit grayscale
Compatibility
netpbm, OpenCV, MATLAB
Best for
Research pipelines, raw luminance

Convert PGM to…

48 direct directions plus 12 workflows, sorted A–Z; 🔥 marks popular targets.

PGM to AVIF Hot PGM to BMP Hot PGM to CIN PGM to CUR PGM to DCX PGM to DDS PGM to FARBFELD PGM to FITS PGM to GIF Hot PGM to GRAY PGM to GRAYA PGM to HDR PGM to ICO Hot PGM to J2C PGM to J2K PGM to JFIF PGM to JP2 PGM to JPE PGM to JPEG Hot PGM to JPG Hot PGM to JPT PGM to JXL PGM to OTB PGM to PALM PGM to PBM PGM to PCL PGM to PCX PGM to PDF Hot PGM to PFM PGM to PNG Hot PGM to PNG24 PGM to PNG8 PGM to PNM PGM to PPM PGM to QOI PGM to RAS PGM to SIXEL PGM to SVG Hot PGM to SVGZ PGM to TGA PGM to TIF PGM to TIFF Hot PGM to UYVY PGM to VICAR PGM to WebP Hot PGM to XBM PGM to XPM PGM to XV

Cross-engine workflows

PGM to 7Z PGM to APK PGM to JAR PGM to TAR PGM to TAR.BZ2 PGM to TAR.GZ PGM to TAR.XZ PGM to TBZ2 PGM to TGZ PGM to TXZ PGM to WIM PGM to ZIP

Convert other files to PGM…

AVIF to PGM Hot BMP to PGM Hot CIN to PGM CUR to PGM DCX to PGM DDS to PGM FARBFELD to PGM FITS to PGM GeoTIFF to PGM GIF to PGM Hot GRAY to PGM GRAYA to PGM HDR to PGM HEIC to PGM Hot HEIF to PGM ICO to PGM Hot J2C to PGM J2K to PGM JFIF to PGM JP2 to PGM JPE to PGM JPEG to PGM Hot JPG to PGM Hot JPT to PGM JXL to PGM OTB to PGM PALM to PGM PBM to PGM PCL to PGM PCX to PGM PFM to PGM PNG to PGM Hot PNG24 to PGM PNG8 to PGM PNM to PGM PPM to PGM PSB to PGM PSD to PGM Hot QOI to PGM RAS to PGM RAW to PGM Hot SIXEL to PGM SVG to PGM Hot SVGZ to PGM TGA to PGM TIF to PGM TIFF to PGM Hot UYVY to PGM VICAR to PGM WebP to PGM Hot XBM to PGM XPM to PGM XV to PGM

Frequently asked questions

What is a PGM file?

PGM is netpbm's grayscale format — 8 or 16-bit samples, ASCII or binary, zero compression. Computer-vision research and image-processing courses live on it.

How do I convert PGM files online?

Pick a target format from the "Convert PGM to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert PGM files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can PGM convert to?

This page lists all 60 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.