Free Online Code Formatters Compared (2026): Which One Is Actually Good?

Free Online Code Formatters Compared (2026): Which One Is Actually Good? Code formatting is one of those debates that consumes hours in team discussions ("tabs vs spaces," anyone?) and then gets solved forever once the team adopts a formatter. But before you land on a local setup with Prettier or Black or gofmt, you often need a quick online option — to format a snippet you're reviewing, to clean up code from a tutorial, or to reformat a config file pasted from somewhere. We tested 9 free online code formatters across JavaScript, TypeScript, CSS, HTML, and SQL. The differences are significant enough that your choice actually matters. What We Evaluated Output quality. Does the formatted output match what Prettier or the language's standard formatter would produce? Are comments preserved? Is indentation consistent? Language coverage. How many languages does it support? Does "supports JavaScript" mean it handles modern ES2024 syntax, or just ES5? Configuration. Can you set tab width? Semi