CRW Image to G4 conversion is the process of transforming Canon Raw Image files (CRW) — an unprocessed, camera-generated raw format produced by older Canon digital cameras — into G4 (G4), a raster image format that typically refers to Group 4 fax-compressed TIFF imagery. This conversion decodes the raw sensor data and re-encodes it into a G4-compatible raster image, optionally applying demosaicing, color correction, and compression settings to produce a compact, viewable file.
Related guides
Practical guides to help you choose formats, preserve quality, and avoid common conversion problems.
WebP has quietly become the default image format of the modern web, delivering 25-35% smaller files than JPG and PNG with universal browser support. This 2026 guide covers current adoption stats, browser compatibility, WordPress integration, conversion workflows, and when to choose WebP over AVIF for optimal Core Web Vitals performance.
Read guide →Not sure whether to save your image as PNG or JPG? This detailed comparison covers compression, transparency, file size, web performance, and real-world use cases so you can pick the right format every time — with conversion links when you need to switch.
Read guide →Learn how to convert HEIC to JPG for maximum compatibility. This guide explains what HEIC is, why iPhones use it, the key differences between HEIC and JPG, and walks through every conversion method including online tools, iPhone settings, Windows, and Mac.
Read guide →Drag your .CRW file from your computer or use the browse function.
Confirm .g4 as the selected destination format.
Click "Convert" and download your converted .G4 file once ready.
CRW files have the MIME type image/x-canon-crw and are typically used in professional photography workflows. G4 files use the MIME type image/g4 and are commonly employed in fax transmissions and document archiving. The G4 format utilizes CCITT Group 4 compression, a lossless codec designed specifically for monochrome images.
The G4 (.G4) format is commonly used for image. Understanding its characteristics can be helpful when converting to or from other formats like CRW Image.
While specific technical details aren't available here, G4 files generally serve the purpose of storing image effectively within their domain.
Easily convert your CRW Image files to G4 format using our fast and user-friendly online converter. Designed to deliver high-quality output, our tool supports seamless transformation from CRW to G4 without any technical hassle.
CRW Images are raw files captured by Canon cameras, preserving extensive image data but often resulting in large file sizes. G4 format, in contrast, is a compressed monochrome image format primarily used for fax and document exchange, offering faster transmission and reduced storage needs. While CRW focuses on high-detail color images, G4 is optimized for efficient black-and-white image compression.
Keep CRW source files under 250MB each for smoother web-based conversion; very large raw files may exceed online tool limits and be slower to process.
Preserve quality by applying pro demosaicing and white balance correction before converting to the bilevel G4 format; convert to grayscale first if you need better control over tones.
For batch conversion, use a desktop tool or automated script that supports CRW parsing and G4/TIFF Group 4 output to retain consistent settings across files.
Be aware format limitation: G4 is a bilevel (black-and-white) compression used for fax-style images — continuous-tone color and subtle gradients from CRW will be reduced to black/white or dithered approximations.
This online CRW to G4 converter saved me hours converting files.
Emily R.
Photographer
Simple, fast, and reliable conversion with excellent output quality.
Mark L.
Graphic Designer
Perfect for preparing images for fax and archiving without extra software.
Nina S.
Office Manager
Start your free CRW to G4 conversion now.
Drag your file here to to upload.
Up to 250MB
If you need archival or high-quality photographic results, consider converting CRW to TIFF (lossless color) first, then generate G4 versions only when a bilevel result is specifically required.