HTML Formatter
Format HTML markup with readable indentation.
Format HTML markup with readable indentation.
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Tool guide
Free Online HTML Formatter
Add readable line breaks and two- or four-space indentation to basic HTML markup. The formatter uses lightweight text rules rather than a full HTML parser, so review scripts, styles, templates, inline text, and whitespace-sensitive elements carefully.
Steps
How it works
- Paste HTML or choose one HTML, HTM, or TXT file.
- Select two- or four-space indentation.
- Run the lightweight formatter to split and indent markup.
- Review, copy, or download the formatted HTML.
Highlights
Key features
- Formats basic nested tags with readable line breaks.
- Recognizes standard HTML void elements when calculating indentation.
- Offers two- and four-space indentation.
- Works with full documents, fragments, pasted text, and supported file input.
- Provides copy and formatted HTML download actions.
Use cases
Common uses
- Make compact HTML snippets easier to inspect.
- Indent simple static page markup for documentation.
- Clean up basic nested HTML before manual editing.
- Format an uploaded HTML file without installing an editor extension.
Notes
Limitations to know
- Formatting is regex- and whitespace-based rather than parser- or tokenizer-based.
- Inline text, preformatted content, scripts, styles, comments, templates, and framework syntax may be changed or indented incorrectly.
- The formatter does not validate, repair, sanitize, or test HTML.
- Attributes are not reformatted, and exact whitespace, quoting, and source representation are not preserved.
- Malformed or incomplete HTML may still produce output instead of a syntax error.
FAQ
Frequently asked questions
Does formatting change how the page renders?
It can. Whitespace changes may affect inline or preformatted content, so review the rendered result when spacing matters.
Can it format HTML fragments?
Yes for many basic fragments, although it does not parse them into a browser DOM before formatting.
Are script and style blocks preserved?
Their text remains in the input flow, but the lightweight formatter may alter whitespace or split content incorrectly.
Does HTML Formatter repair invalid HTML?
No. It rearranges text and does not perform browser repair or standards validation.
Is the output sanitized?
No. The formatter does not remove scripts, unsafe attributes, or other potentially dangerous markup.
Can I select indentation?
Yes. Choose two or four spaces.