AscendLab

Developer tools

HTML 格式化

New free tool

HTML Formatter & Minifier Online

Clean up HTML snippets for docs, templates, email fragments, CMS blocks, and publishing workflows. Format for review or minify for compact copy-ready output.

Quick answer

An HTML formatter makes a compact snippet easier to scan by adding line breaks and indentation.

An HTML minifier removes comments and extra whitespace for compact snippets.

Best inputs for HTML cleanup

Use snippets and fragments

This is best for short HTML blocks copied from docs, CMS fields, email templates, or examples.

Validate complete pages elsewhere

For full documents, use a standards validator after formatting and manual review.

HTML input
Paste an HTML snippet to format or minify it locally in the browser.

Try a common HTML snippet

Snippet analyzed

14 tags, 0 comments, 180 B input, 0 B removable whitespace/comment bytes estimated.

Output
Copy formatted or compact HTML for docs, templates, and quick snippets.
Example
Paste a one-line CMS embed, format it to inspect the tags, then convert it to Markdown if it belongs in a docs workflow.
Assumption
The input is an HTML snippet where tag-based indentation is enough for quick review.
Limitation
The formatter is lightweight and does not fully validate malformed HTML, embedded scripts, or template language syntax.

Suggested workflow

HTML publishing cleanup path

Clean a snippet, convert or escape it, and preview the final publishing format.

Related tools

Keep cleaning markup

Frequently asked questions

Does this HTML formatter upload my code?

No. Formatting and minifying happen locally in the browser.

Can it minify HTML?

Yes. The minify action removes comments and collapses unnecessary whitespace for compact snippets.

Is this a full HTML validator?

No. It is a lightweight formatter for snippets, not a standards validator for complete web pages.

Can I use it before converting HTML to Markdown?

Yes. Formatting a messy snippet first can make it easier to review before converting or previewing.