JBG to CUR Converter

Turn JBG files into CUR format — free online

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Archive Unlock

Unlock JBG document archives by converting to CUR — viewable everywhere without JBIG-compatible tools.

Browser-Based Tool

Convert JBG to CUR directly in your web browser. No desktop software, plugins, or downloads required.

Data Protection

Your JBG files are removed immediately after processing. Converted CUR output is purged within 24 hours.

How to convert JBG to CUR

1

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

2

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

3

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

About formats

JBG is a file extension for images compressed using the JBIG (Joint Bi-level Image experts Group) standard, formally ITU-T Recommendation T.82, completed in 1993 as a successor to the Group 3 and Group 4 fax compression standards. JBIG compression is designed for bi-level (black and white) images but can also handle grayscale and limited-color images by encoding each bit plane separately. The algorithm uses a form of arithmetic coding guided by an adaptive context model: for each pixel, the encoder examines a template of surrounding already-coded pixels to build a probability estimate, then feeds this estimate to a QM-coder (a variant of the Q-coder arithmetic coder) that produces a highly efficient binary output. JBIG achieves 20-40% better compression than Group 4 on typical document images, with the improvement being even larger on halftoned photographs and images with gradual density transitions where Group 4's simple run-length approach is less effective. The standard supports progressive encoding, where a low-resolution version of the image is transmitted first and progressively refined — useful for fax-like applications where the receiver can begin displaying the image before the full-resolution data arrives. One advantage is superior compression of documents containing halftone images: newspapers, magazines, and marketing materials that mix text with photographic halftones compress dramatically better with JBIG than with Group 3/4. The standard's ITU-T backing ensures it is implemented in document imaging hardware and software worldwide. JBG files are supported by ImageMagick and various document imaging tools.
Initial release: 1993
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

Frequently Asked Questions

Why convert JBG to CUR?

CUR is universally supported. Converting JBG images to CUR enables viewing on any device or platform.

What opens CUR files?

Open CUR files using Windows cursor editor, IrfanView, or RealWorld Cursor Editor.

Does conversion affect image clarity?

Yes — text and line art from JBG files convert with full clarity. The CUR output retains original sharpness.

Can I convert JBG to CUR for free?

Yes — basic JBG to CUR conversion is free. Premium tiers provide additional throughput and faster processing.

Does the converter support batch processing?

Batch conversion is supported. Upload several JBG files simultaneously and download each CUR result.

Do I need to create an account?

No registration is needed for standard conversions. Upload your JBG file, convert, and download the CUR result.

JBG to CUR Quality Rating

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