PICON to JBG Converter

Transform PICON graphics into JBG images with a few clicks

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Privacy Protected

Your PICON files are deleted immediately after conversion to JBG. Converted files are automatically removed from servers within 24 hours.

Any Device Works

Convert PICON to JBG from Windows, macOS, Linux, or mobile — the browser-based tool adapts to any screen size and operating system.

Effortless Process

Converting PICON to JBG takes just a few clicks — no technical knowledge required. Upload, choose your format, and download the result.

How to convert PICON to JBG

1

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

2

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

3

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

About formats

PICON (Personal Icon) is a small-format image type used in the X Window System ecosystem, developed by Steve Kinzler at Indiana University around 1990 as part of the picons (personal icons) database project. Picons are small, typically 48x48 pixel, color images used as visual identifiers for people, organizations, domains, and Usenet newsgroups in Unix mail readers, news readers, and other communication tools. The picon format is essentially an XPM (X PixMap) image stored with specific naming conventions and directory structures that allow software to look up the appropriate icon based on email address, domain name, or newsgroup name. The picons database organized thousands of these small images in a hierarchical directory structure keyed by domain name components (e.g., faces/com/example/user.xpm), enabling mail clients like exmstrstrstr and faces to automatically display a sender's photo or organizational logo alongside their messages. The system predated the modern concept of contact photos and avatars by more than a decade. One advantage is the system's pioneering role in visual identity for electronic communication: picons introduced the idea that email and Usenet messages should display a visual representation of the sender — a concept that eventually became standard in every modern email client, messaging app, and social media platform. The XPM-based format ensures that picons are displayable on any system with X Window libraries. Picon images are supported by ImageMagick, GIMP, and X Window display utilities, and the historical picons database remains archived online at Indiana University.
Developer: Steve Kinzler
Initial release: 1990
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

Frequently Asked Questions

What is the reason to convert PICON to JBG?

PICON is a small thumbnail/icon format from Unix systems with limited modern support. Converting to JBG (efficient compression for bi-level images) makes your images accessible on any modern platform.

Which software can view JBG files?

JBG files can be opened with ImageMagick, IrfanView, jbig-kit tools. Most of these are available across Windows, macOS, and Linux.

Are my uploaded files kept private?

Completely. Convertio removes uploaded PICON files right after conversion, and the JBG output is automatically deleted within 24 hours.

Does this converter work on mobile devices?

Yes — Convertio runs entirely in the browser. You can convert PICON to JBG on phones, tablets, or desktops without installing anything.

Can I convert multiple PICON files to JBG at once?

Convertio supports batch mode — drag in multiple PICON files and they all convert to JBG together, which is much faster than one-by-one.

Does converting PICON to JBG affect quality?

The conversion preserves the visual content of your PICON image. JBG will reproduce the same pixel data within the limits of its format capabilities.