HtmlG

A free browser-based HTML editor lets users clean, convert, and edit HTML code without downloading any software. A solo developer built the tool as a hobby project, focusing on simplicity and practical utility rather than chasing a grand vision. The site grew organically through search traffic and word of mouth, requiring minimal ongoing maintenance. It now generates $6,000 per month in entirely passive income through Google AdSense, demonstrating that straightforward developer utility tools can become reliable, long-term revenue streams.