Format & Convert Tools
15 toolsCode formatting and data conversion are two of the most frequent tasks in a developer's daily workflow. Poorly formatted code slows down code reviews, increases merge conflicts, and makes debugging significantly harder. Minified production assets, on the other hand, reduce page load times and bandwidth consumption — a direct ranking factor for search engines and a critical metric for user experience. These browser-based tools handle the full spectrum: beautify messy or minified JSON, HTML, CSS, JavaScript, and SQL into readable code with proper indentation; convert between data formats like JSON to CSV, YAML to JSON, and JSON to TypeScript interfaces; minify CSS and JavaScript for production deployment; and compress or convert images to modern formats like WebP. Every operation runs entirely in your browser — your code and data never leave your device, making these tools safe for proprietary source code, API responses containing sensitive data, and internal configuration files. No installation, no account, no file uploads.
JSON Formatter & Validator
Free online JSON formatter and validator with syntax highlighting. Paste minified JSON and instantly beautify, validate, or minify it — no login required, works entirely in your browser.
HTML Formatter
Beautify or minify HTML code online for free. Auto-indents nested tags, formats attributes, and produces clean readable HTML output — instant, no installation needed.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases in real time. Free online number base converter with instant results as you type.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML online for free. Bidirectional conversion with syntax validation — perfect for Kubernetes configs, Docker Compose, and API work.
Markdown Preview
Write Markdown and see a live rendered HTML preview side by side. Free online Markdown editor and previewer — no signup, no installation, works in your browser.
CSS Minifier
Minify CSS files online by removing comments, whitespace, and redundant characters. Also beautify compressed CSS back to readable format — free and instant.
JavaScript Beautifier
Beautify and format messy or minified JavaScript code with proper indentation. Also minify JS to reduce file size — free online JavaScript formatter.
SQL Formatter
Format and beautify SQL queries online with proper indentation and uppercase keywords. Also minify SQL — free tool supporting SELECT, JOIN, WHERE, GROUP BY, and more.
JSON to CSV Converter
Convert JSON arrays to CSV and CSV back to JSON online for free. Handles nested values, quoted fields, and commas in values — instant bidirectional conversion.
JSON to TypeScript Type Generator
Convert JSON to TypeScript interfaces and type aliases instantly. Supports nested objects, arrays, nullable types, and union types — free online JSON to TS converter with no signup.
JSON Path Finder
Query and filter JSON data with JSONPath expressions. Find nested values, extract arrays, and debug complex JSON structures instantly — free online tool, runs entirely in your browser.
XML Formatter & XML to JSON
Free online XML formatter, minifier, and XML to JSON converter. Beautify messy XML, minify for production, or convert between XML and JSON — all in your browser.
Markdown to HTML Converter
Free online Markdown to HTML and HTML to Markdown converter. Convert between Markdown and HTML instantly — supports tables, code blocks, links, and all CommonMark syntax.
Common Use Cases
Beautify minified API responses for debugging and code review
Convert Kubernetes YAML configs to JSON for programmatic processing
Minify CSS and JavaScript before deploying to production
Transform JSON API data to CSV for spreadsheet analysis and reporting
Format messy SQL queries for readability before committing to version control
Convert JSON schemas to TypeScript interfaces for type-safe development
Compress and convert images to WebP for faster page load times
Frequently Asked Questions
Do these formatting tools modify my original files?
No. All formatters and converters work on the text you paste into them. Your original files remain untouched. Copy the formatted output and paste it back into your editor when you are satisfied with the result.
Can I use these tools for production build pipelines?
These tools are designed for quick, one-off formatting and conversion tasks. For automated production pipelines, use dedicated build tools like Prettier, ESLint, or PostCSS that integrate with your CI/CD workflow.
Is my code or data sent to any server during formatting?
No. Every tool on this page runs entirely in your browser using JavaScript. Your code and data never leave your device, making these tools safe for proprietary or sensitive content.
What is the difference between a formatter and a linter?
A formatter (like these tools) changes only the visual appearance of code — whitespace, indentation, and line breaks — without altering its behavior. A linter (like ESLint or Stylelint) analyzes code for potential errors, code-smell patterns, and style violations. In a professional workflow, you typically use both: a linter to catch bugs and enforce rules, and a formatter to ensure consistent visual style.
When should I minify code vs. beautify it?
Beautify code during development so it is easy to read, debug, and review. Minify code for production deployment to reduce file sizes, decrease load times, and lower bandwidth costs. Most build pipelines (Webpack, Vite, esbuild) handle minification automatically, but these tools are useful for quick one-off tasks, inspecting already-minified code, or preparing snippets for documentation.
Which data format should I choose: JSON, YAML, or CSV?
JSON is the standard for APIs, configuration files, and data exchange between systems — it is widely supported and strictly typed. YAML is preferred for human-edited configuration files (Kubernetes, Docker Compose, CI/CD pipelines) because it supports comments and is more readable for deeply nested structures. CSV is ideal for tabular data that needs to be opened in spreadsheet applications like Excel. Use the converters on this page to switch between formats as your workflow requires.
How much file size reduction does minification typically achieve?
CSS minification typically reduces file size by 15–30%, while JavaScript minification achieves 30–60% depending on the amount of whitespace, comments, and variable name length in the source. Image compression (JPEG to WebP conversion) can reduce image sizes by 60–80% at equivalent visual quality. For a typical web page, combining asset minification with image optimization can reduce total page weight by 50% or more.
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