Auto-formats source code across 15+ languages — JavaScript, Python, HTML, CSS, SQL, YAML — with language-aware indentation and syntax rules.
Content reviewed October 2026 · About Toolzum
Beautify or minify HTML, CSS, JavaScript, XML, ERB, LESS, and SCSS with a single click. HTML, CSS, JS, XML, and more normalize in one pass — local processing, free, no signup.
Minify CSS by stripping whitespace, comments, and dead semicolons — smaller stylesheets instantly. Shrink a 50 KB file by 30% — local clean-css work, free, no signup.
Lint HTML for missing DOCTYPE, unclosed tags, and unexpected closing tags. Paste your HTML and get instant feedback. Catch errors before browsers guess wrong — free, local, no signup.
Convert Markdown to clean HTML for CMS paste and publishing — headings, tables, code blocks. Turn README sources into pages — local conversion, free, no signup.
Convert between case styles, CSS preprocessors (SCSS/Less/Stylus), HTML/JSX, number bases, serialization formats (YAML/INI/TOML/JSON), and time zones. One tool for all text transformations.
Syntax signatures route each snippet: braces with function keywords go JS, selectors go CSS, tags go HTML. Mixed pastes split by detected blocks.
For full files and strict configs — this tool optimizes pastes and snippets. Thousand-line sources deserve their dedicated formatter.
Basic syntax sanity inline (unbalanced braces flagged); deep validation belongs to linters. Formatting never hides real errors.
No — formatting runs locally in your browser. Code never leaves your device.
Code Beautifier & Minifier
Beautify or minify HTML, CSS, JavaScript, XML, ERB, LESS, and SCSS with a single click. HTML, CSS, JS, XML, and more normalize in one pass — local processing, free, no signup.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.
Python Formatter
Formats Python code with PEP 8 compliant indentation, consistent spacing, and readable structure for scripts and modules.