ToolkitBook
Clean up messy HTML with this browser-based formatter. Check syntax for unclosed tags and structural issues. Beautify code with proper indentation for readability. Remove HTML, CSS, and JavaScript comments to reduce file size. Strip empty lines to optimize your code. Handles embedded style and script blocks with their own comment formats.
Want to process multiple HTML files? Try the Batch HTML Formatter.
Paste your HTML code into the input area. Click "Check Syntax" to scan for errors. If the code passes, select the operations you want: Format adds proper indentation, Remove Comments strips HTML, CSS, and JS comments, and Remove Empty Lines deletes blank lines. Then click "Process HTML" to apply your selections.
The tool handles four comment types. HTML comments look like <!-- comment -->. CSS comments inside <style> tags use /* comment */. JavaScript comments inside <script> tags use both // single-line and /* multi-line */ formats. Jinja2 template comments use syntax. All four get stripped when you enable Remove Comments.
The checker uses the browser's built-in HTML parser. It detects unclosed tags, mismatched tag pairs, invalid attribute syntax, and other structural issues. Each error shows the line number and a description of what went wrong.
Comments and blank lines add to file size without affecting how the page renders. Stripping them reduces download time and bandwidth usage. It also removes internal notes, TODO markers, and debugging hints that shouldn't reach production.
No. The formatter only adjusts whitespace and indentation. It preserves all tags, attributes, text content, and their order. Inline elements stay inline, and block elements get their own lines with proper nesting levels.
Yes. The tool handles complete HTML documents with <style> and <script> blocks. CSS and JavaScript inside those blocks gets formatted and cleaned along with the surrounding HTML.
The syntax checker lists each error with its line number and a brief explanation. Fix the errors in your source and check again. Processing won't run until the HTML passes validation.
No. All processing happens in your browser. Your HTML never leaves your computer.