# tidy > Clean up and pretty print HTML, XHTML and XML files. > Note: `tidy` cannot preserve original indentation. > More information: . - Pretty print an HTML file: `tidy {{path/to/file.html}}` - Enable [i]ndentation, [w]rapping lines in 100, saving to `output.html`: `tidy --indent y --wrap 100 -output {{path/to/output.html}} {{path/to/file.html}}` - Modify an HTML file in-place using a configuration file: `tidy -config {{path/to/configuration}} -modify {{path/to/file.html}}`