Online Code Formatters & Validators
Free browser-based tools to format, beautify, and validate JSON, XML, SQL, CSS, HTML, Markdown, YAML, and SVG. Paste your code and get readable, properly-indented output instantly — all processing runs client-side.
11
tools
Free
always
100%
browser-based
0
data stored
JSON Formatter
Format, validate, and minify JSON with syntax highlighting.
XML Formatter
Prettify and validate XML documents instantly.
SQL Formatter
Format and beautify SQL queries for better readability.
CSS Formatter
Prettify and minify CSS stylesheets.
Markdown Preview
Write Markdown and see a live rendered HTML preview.
HTML Formatter
Prettify and minify HTML markup. All processing in your browser.
JSON Schema Generator
Generate a JSON Schema from any JSON object automatically.
YAML Validator
Validate and format YAML files with clear error messages.
JSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07).
JavaScript Minifier
Minify JavaScript code by removing comments and collapsing whitespace.
SVG Minifier
Remove comments, metadata, and whitespace from SVG files to reduce file size.
What is a code formatter?
A code formatter parses raw source code or data and re-serializes it with consistent indentation, line breaks, and spacing. Formatted code is significantly easier to read, review, and debug than minified or manually written output.
Why format in the browser?
All tools on this page run entirely in your browser using JavaScript — no server request is made. This means your code (including API keys, secrets, and proprietary logic) never leaves your device. It also means formatting is instant, works offline, and has no rate limits.
Popular formatters
- JSON Formatter — beautify and validate JSON with syntax highlighting; switch to Minify mode for production payloads.
- SQL Formatter — indent SQL queries for MySQL, PostgreSQL, and T-SQL with keyword capitalization.
- CSS Formatter — normalize stylesheets: sort properties, fix indentation, or minify for deployment.
- XML Formatter — prettify XML with proper indentation and check well-formedness errors.
- YAML Validator — check YAML syntax and format with correct indentation — great for Kubernetes and CI configs.