elfcat is a zero-dependency Rust CLI tool that transforms ELF binary files into interactive, self-contained HTML visualizations. It parses the full ELF structure—file header, program headers, section headers, segments, sections, notes, and string tables—and generates an HTML page with a hex dump where bytes are color-coded by their structural role (e.g., ident, header fields, segments, sections). The output includes interactive features: hovering highlights the corresponding bytes in the hex dump, clicking fields with cross-references (like e_phoff or sh_offset) jumps to the referenced area and draws SVG arrows, and detailed info tables appear on hover for headers, segments, and sections. The tool is purely client-side; no server is involved, and the HTML report works offline in any modern browser. The codebase is well-structured, using Rust's trait system to abstract over 32-bit and 64-bit ELF formats without duplication, and it depends only on the Rust standard library.