Format and beautify HTML, CSS, JavaScript, JSON, XML, SQL, YAML, and more — instantly readable code with proper indentation.
Beautify and indent HTML markup instantly. Free online HTML formatter with custom indentation, attribute wrapping, and one-click copy — browser-based.
Beautify, indent, and tidy CSS stylesheets instantly. Free online CSS formatter with customizable indentation and selector grouping — browser-based.
Beautify, indent, and clean up JavaScript code instantly. Free online JS formatter with customizable indentation, brace style, and one-click copy.
View, format, validate, and explore JSON data with collapsible nodes, syntax highlighting, and one-click copy — free and browser-based.
Format, validate, and minify XML documents instantly. Free online XML beautifier with syntax highlighting, error detection, and one-click copy.
Format, beautify, and standardise SQL queries instantly. Free online SQL formatter supporting MySQL, PostgreSQL, SQL Server, Oracle, and SQLite.
Convert Markdown to HTML instantly. Free online Markdown to HTML converter using the marked library — supports headings, lists, code, links, tables, and more.
Format, beautify, minify, and validate JSON instantly. Free online JSON formatter with 2/4/8-space indentation, syntax-error reporting, and one-click copy.
Messy, minified, or inconsistently indented code slows down every developer and reviewer. Tooloogle's code formatters instantly transform unreadable input into clean, properly structured output. No IDE plugins, no local setup, no command-line tools — paste, format, copy, done.
Indent and structure messy HTML markup with proper nesting, configurable indent size (2 or 4 spaces), and intelligent attribute wrapping for long tags. Preserves embedded scripts and styles, optionally formats them, and keeps comments intact.
Expand minified CSS into organised, readable stylesheets with consistent indentation, brace placement, and one-property-per-line formatting. Preserves comments and vendor prefixes. Optional sort-properties mode for cleaner diffs.
Format compressed or obfuscated JS/TS code into clean, debuggable output following Prettier-style conventions. Configurable for indent size, line length, semicolons, single vs double quotes, and trailing commas. Handles JSX, TSX, and modern ES2022+ syntax.
Pretty-print JSON with syntax highlighting and a collapsible tree view. Validate against JSON Schema. Detect and fix common issues (trailing commas, single quotes, unquoted keys) before formatting. Compare two JSON documents side-by-side with a visual diff.
Transform JSON arrays into downloadable CSV files for spreadsheets and data analysis. Convert CSVs back to JSON for database imports and API testing. Handles nested objects via dot-notation flattening, arrays via comma-joining, and edge cases like quoted commas and embedded newlines.
Pretty-print XML documents with proper indentation, tag alignment, and namespace handling. Validate against DTDs and XSDs. Convert XML to JSON and back, useful for legacy API integration.
Beautify complex SQL queries with keyword highlighting, logical line breaks, and consistent indentation. Supports MySQL, PostgreSQL, SQL Server, Oracle, and SQLite dialects. Detects and aligns JOINs, WHERE conditions, and CASE expressions for easier review.
Format and validate YAML files used in CI/CD pipelines, Kubernetes manifests, Docker Compose, and OpenAPI specs. Convert YAML to JSON for tools that need JSON. Preserve comments where supported.
Clean up markdown files with consistent heading levels, list indentation, and link formatting. Preview rendered output side-by-side. Convert markdown to HTML for blog imports and documentation pipelines.
Format GraphQL queries, mutations, and schemas with proper indentation. Validate syntax. Convert between schema-definition language (SDL) and JSON introspection results.
Front-end and back-end developers. Database administrators reviewing query performance. QA engineers comparing API responses. Technical writers preparing code samples for documentation. Code reviewers parsing pull requests. Students learning to read messy real-world code. Anyone who's ever been handed a 5,000-character minified one-liner and asked "what does this do?"
Sometimes you just need to clean a snippet from a Slack message, a Stack Overflow answer, or an API log without opening your editor. Paste, format, copy — done in seconds. All processing happens in your browser, so confidential code (proprietary algorithms, internal APIs, customer data fragments) never leaves your device. Verify by checking the Network tab: zero requests fire when you click "Format".
Each formatter offers options that match the major style guides: Prettier, Standard, Airbnb, Google, GitHub. Set your preferences once and they persist via local storage so every session uses your defaults.
Most formatters include a diff view so you can see exactly what changed: added line breaks, fixed indentation, sorted properties. Useful when reformatting old code as part of a code review or migration.
Beyond the tools themselves, this category includes articles on code style, formatter philosophy (Prettier vs ESLint, opinionated vs configurable), how to set up auto-formatting in VS Code, JetBrains, and Vim, integrating formatters into pre-commit hooks and CI pipelines, and the trade-offs between different style guides for team adoption.
Run a formatter consistently across your team — agreement on style matters more than which style you pick. Use a pre-commit hook to enforce formatting automatically; relying on humans to remember always fails eventually. For shared open-source projects, configure your formatter via a checked-in config file (.prettierrc, .editorconfig) so contributors don't need to install editor extensions. Format generated code separately or exclude it via configuration to keep diffs clean.