Format HTML with strict whitespace sensitivity, untouched embedded script/style bodies, readable parser errors and source/output comparison in your browser.
Choose your path
Prepare a readable markup review while explicitly considering inline whitespace, preformatted text, raw-text elements and browser rendering.
Retain inline punctuation and preformatted text while reviewing markup.
Format inline/pre examples with strict whitespace, compare source/output and copy code only.
Text relationships remain visible and embedded script/style content is not reformatted as another language.
Separate syntax formatting from sanitization and accessibility.
Try mismatched tags and an event-handler attribute; recover from parser errors and read rendering boundaries.
Errors have no partial output; success makes no sanitization or conformance claim.
Review long markup and save a current handoff on a narrow screen.
Use stacked labeled editors, adjust indent, rerun and explicitly save source/result/rendering notes.
No horizontal page overflow or stale save after an input/settings change.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Prettier 3.9.6 uses strict HTML whitespace sensitivity with embedded formatting off. Parsed raw-text and preformatted bodies are restored exactly using source spans, with a 15,000-node limit. Other markup may normalize; test browser rendering separately.
An explicit run loads the language engine in a disposable worker. Cancellation and a wall-clock timeout prevent abandoned work from updating results. Input code is never executed.
Input or option changes invalidate old output. Copy/download contain code only, not an appended report. Formatting is not automatic repair or runtime validation.
Updated: August 2026
Compare punctuation and spacing around strong, span and other inline markup before accepting a formatted document.
Review pre and textarea text, character references and comments without treating every angle bracket as a tag boundary.
Save reviewed source, formatted HTML and rendering warnings to the REST API Project; separately test the real page.
Review HTML fragments or documents with strict whitespace sensitivity. Script and style formatting is disabled. The tool displays plain text only and never renders pasted HTML.