CCITT Group 3
Writableimage
lossless compressed data format for bi-level images
Identify it
| Extensions | .g3 |
|---|---|
| MIME types | image/g3fax |
| Wikidata | Q28234649 |
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Open it
- ImageMagickOpen source
- GIMPOpen source
- imageioOpen source
- NetpbmOpen source
Convert it
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| Portable Network Graphics | ImageMagick | Lossless | convert in.g3 out.pngPixels kept; some metadata, colour profiles or layers may be dropped. |
| Tagged Image File Format | ImageMagick | Lossless | convert in.g3 out.tifPixels kept; some metadata, colour profiles or layers may be dropped. |
| GIF 89a | ImageMagick | Lossy | convert in.g3 out.gifReduced to 256 colours. |
| JPEG File Interchange Format 1.02 | ImageMagick | Lossy | convert in.g3 out.jpgLossy compression. |
| WebP | ImageMagick | Lossy | convert in.g3 out.webpLossy compression. |
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), Wikidata. Updated 2026-10-24.