JB2 is a JBIG2-compressed bi-level image, the same symbol-based scanned-document codec, often seen inside DjVu files. DjVu uses JB2 for the text layer of a scanned page, which is why a scanned book in DjVu can be a fraction of the size of the same PDF. Analyser handles .JB2 alongside related formats such as .TGA, .QOI, .PPM and more. In Analyser's format library, .JB2 sits in the Images category.

How do I open a .JB2 file?

Drop a .JB2 file onto Analyser at https://lab.valjdakosta.com/ and it is identified directly in your browser - no upload, no account and no software to install. Decode and preview extra still-image formats in pure JavaScript - Truevision TGA, QOI, Netpbm (PPM/PGM/PBM), PCX, farbfeld, WBMP, XBM/XPM, Sun Raster and SGI are fully rendered - and read header metadata from codec-heavy formats: Radiance HDR, DirectDraw Surface (DDS) game textures, OpenEXR, JPEG 2000, JPEG XR, EPS/PostScript, Windows WMF/EMF metafiles, Apple ICNS icons, CUR/ANI cursors, MNG and Lottie animations.

Can I open a .JB2 file online for free?

Yes. Analyser is a free online .JB2 identifier that runs entirely in your browser - your .JB2 file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.JB2 file - what it is and how to identify it online

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Home › Formats › .JB2ID

What is a .JB2 file?

JB2 is a JBIG2-compressed bi-level image, the same symbol-based scanned-document codec, often seen inside DjVu files.

Did you know: DjVu uses JB2 for the text layer of a scanned page, which is why a scanned book in DjVu can be a fraction of the size of the same PDF.
Analyser handles .JB2 alongside related formats such as .TGA, .QOI, .PPM and more.
In Analyser's format library, .JB2 sits in the Images category.
What Analyser reads: Decode and preview extra still-image formats in pure JavaScript - Truevision TGA, QOI, Netpbm (PPM/PGM/PBM), PCX, farbfeld, WBMP, XBM/XPM, Sun Raster and SGI are fully rendered - and read header metadata from codec-heavy formats: Radiance HDR, DirectDraw Surface (DDS) game textures, OpenEXR, JPEG 2000, JPEG XR, EPS/PostScript, Windows WMF/EMF metafiles, Apple ICNS icons, CUR/ANI cursors, MNG and Lottie animations.
Depth of analysis: .JB2 is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
Open a .JB2 file: Drag a .JB2 file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: .TGA · .QOI · .PPM · .PGM · .PBM · .PNM · .PAM · .PCX · .FF · .FARBFELD · .WBMP · .XBM · .XPM · .RAS · .SGI · .BW · .HDR · .DDS and more. See all supported file types.