G4 is Group 4 fax compression, a more efficient lossless method for black-and-white documents widely used in archiving and scanning.
G4 opens in fax and document tools; convert to TIFF/PDF for general use.
Share, post and embed pictures across sites and apps.
Work with the format in editors like Photoshop and GIMP.
Keep memories and assets in a widely-readable form.
| ✔ Strengths | ✖ Limitations |
|---|---|
| Lossless — keeps full quality | No transparency support |
| Excellent compatibility | Limited support — may need converting |
Remove the background from G4 images, upscale to 4K, or generate new visuals with SharkFoto AI.
G4 is Group 4 fax compression, a more efficient lossless method for black-and-white documents widely used in archiving and scanning.
G4 opens in fax and document tools; convert to TIFF/PDF for general use.
Yes — G4 preserves full quality with no compression loss.
Use SharkFoto's free tools — upload your G4 file and convert it to a more convenient format in seconds. It's free, processed securely and never stored.
No — G4 doesn't store transparency; convert to PNG or WEBP if you need it.