What is a .CLS file?
CLS is a LaTeX document class - the file defining the overall structure and look of a document, such as article, book or a journal’s template.
- Did you know
- Choosing a .cls is the first decision in a LaTeX document, because the class sets everything from margins to how chapters and sections are numbered.
- LaTeX was written by Leslie Lamport in the 1980s as a friendlier layer over Donald Knuth's TeX typesetting engine.
- Academic publishers ship their own .cls files so authors' manuscripts automatically match the journal's exact layout.
- What Analyser reads
- A catch-all for rare and niche formats Analyser still identifies from their bytes: 3D caches and scans (Alembic ABC, FARO FLS/FWS), camera and design data (ARRIRAW ARX, Capture One masks, CATIA CGR), JBIG codestreams, firmware dumps (Binwalk), draw.io diagrams, OptimFROG DualStream audio, RTTTL ringtones, LaTeX style and class files, Sun Raster and Truevision TGA images, MPEG-2 streams, PVR/DVB recordings, Tiled tilesets, Windows Prefetch and Reaper project backups.
- Depth of analysis
- .CLS 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 .CLS file
- Drag a .CLS 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.