CUR to G3 Converter

Turn CUR into G3 format quickly online

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Quick Turnaround

Fast processing means your G3 file is ready moments after uploading the CUR source. No queues or delays for standard jobs.

Quality Output

The converter preserves visual fidelity through the CUR to G3 conversion. Your output maintains the detail of the original.

Works Everywhere

Phone, tablet, laptop, desktop — the CUR to G3 converter runs on any device with a modern browser. No platform restrictions.

How to convert CUR to G3

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose g3 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your g3 file right afterwards

About formats

CUR is the cursor image format for Microsoft Windows), structurally nearly identical to the ICO (icon) format but with the addition of a hotspot coordinate that identifies the precise pixel position where mouse clicks register. Introduced with early Windows versions, CUR files use the same container structure as ICO: a directory header listing one or more image entries, each specifying dimensions and color depth, followed by the pixel data for each variant. Like ICO, a single CUR file can contain multiple images at different sizes and color depths, allowing Windows to select the most appropriate cursor image for the current display resolution and color settings. Image data within CUR files can be stored as BMP pixel arrays (for legacy compatibility) or as embedded PNG images (supported since Windows Vista) for alpha-blended cursors with smooth edges. The hotspot coordinate — the distinguishing feature separating CUR from ICO — is stored as an X,Y pair in the directory entry header, typically pointing to the tip of an arrow or the center of a crosshair. One advantage is multi-resolution packaging: a single CUR file provides appropriate cursor imagery across display densities from standard DPI to high-DPI screens. Native Windows integration is another strength — CUR files are loaded directly by the operating system for mouse cursor) display without any third-party software. CUR files are used by application developers and theme creators to customize the pointing experience across Windows environments.
Developer: Microsoft
Initial release: 1987
G3 is a monochrome image format based on the ITU-T Group 3 facsimile coding standard (Recommendation T.4), ratified by the CCITT in 1980 as the universal compression method for fax transmission over telephone networks. G3 files contain 1-bit (black and white) image data encoded using Modified Huffman (MH) one-dimensional coding, where each scanline is independently compressed by replacing runs of consecutive white or black pixels with variable-length codewords from a predefined Huffman table optimized for typical document content. The standard also defines an optional two-dimensional coding mode (Modified READ) that encodes each line as differences from the previous line, achieving better compression for pages with vertical redundancy. Standard G3 resolution is 204 pixels per inch horizontally and either 98 (standard) or 196 (fine) pixels per inch vertically, producing the characteristic slightly-stretched appearance of received fax documents. The encoding was carefully optimized for the real-time transmission constraints of 1980s modems operating at 2400 to 14400 bps, where encoding and decoding speed had to match the communication channel rate. One advantage is universal telecommunications compatibility: Group 3 encoding remains the mandatory baseline codec for every fax machine manufactured, ensuring that G3 image data can be transmitted to or received from any fax device worldwide. The format's efficiency for document content is another strength — the Huffman tables were statistically tuned to the run-length distributions found in business documents, and typical pages compress to under 30 KB. G3 files are supported by LibreOffice, ImageMagick, and fax server software.
Developer: ITU-T (CCITT)
Initial release: 1980

Frequently Asked Questions

Why convert CUR to G3?

CUR files embed hotspot data irrelevant outside Windows — converting to G3 strips the cursor metadata and keeps the image.

What programs open G3 files?

Fax software, ImageMagick, IrfanView, and GIMP handle G3 encoded fax transmissions

How many CUR files can I convert at once?

You can upload multiple CUR files in one session. Each converts to G3 separately, and all results are downloadable upon completion.

Are colors preserved in the CUR to G3 conversion?

Color information transfers accurately to G3. The converter maintains the original color profile as closely as the target format allows.

Can I convert CUR to G3 without paying?

Yes — basic CUR to G3 conversion is available at no cost. Paid tiers unlock batch mode, bigger uploads, and faster processing.

Does this converter work on mobile devices?

Absolutely. The browser-based converter runs on phones and tablets — iOS, Android, or any device with a modern browser handles it fine.