I Built a Browser-Only Favicon Generator — Text, Emoji & SVG to ICO/PNG (136 Tests, Zero Dependencies)

Short summary

Developer built a zero-dependency favicon generator running entirely in-browser, converting text, emoji, or SVG into PNG and ICO files across 16×16 through 180×180px sizes. The single HTML file implements ICO/ZIP binary formats from scratch with hand-rolled CRC32 and WCAG luminance algorithms, backed by 136 unit tests. Designed for fast, private use without uploads, tracking, or external dependencies.

• •Zero-dependency browser-based favicon tool handles text, emoji, and SVG input
• •Implements low-level binary formats (ICO, ZIP, CRC32) from scratch with 136 tests
• •Technical deep-dive on binary format specs and WCAG color contrast algorithms

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