Free Online Code Formatter & Validator Tools

Format, validate, convert, minify and beautify JSON, HTML, CSS, XML, YAML, Python, SQL and more. Everything runs locally in your browser.

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100% browser-based No upload to server Free to use

Quick JSON Formatter

Paste minified JSON below and format instantly in your browser.

Open full JSON tool

Why Choose TidyCode

Privacy Guaranteed

All processing happens locally in your browser. Your code and data never leave your device.

100% Free

No registration, no watermarks, no hidden fees. Unlimited use for personal and commercial projects.

Lightning Fast

Instant results with no server queue. Format, validate, or convert in seconds.

Easy To Use

Paste or upload, click one button, copy or download. No IDE or CLI setup required.

Works Anywhere

Use on Windows, Mac, Linux, iOS, and Android browsers without installing software.

58+ Tools

Format, validate, convert, minify, and beautify JSON, HTML, CSS, XML, SQL, YAML, and more.

How to Use TidyCode

  1. 1

    Paste or Upload

    Copy your JSON, HTML, CSS, XML, or other source into the editor, or upload a local file.

  2. 2

    Format, Validate, or Convert

    Click the action button to format, validate, minify, beautify, or convert your data instantly.

  3. 3

    Copy or Download

    Copy the result to your clipboard or download the processed file for your project.

Browse All Developer Tools

58+ free developer tools available

Last updated: July 28, 2026

Format Tools

JSON Format JSON Format
XML Format XML Format
HTML Format HTML Format
SQL Format SQL Format
TypeScript Format TypeScript Format
CSS Format CSS Format
Markdown Format Markdown Format
Graphql Format Graphql Format
YAML Format YAML Format
Python Format String Python Format String
Latex Format Latex Format
Java String Format Java String Format
Lua String Format Lua String Format
SVG Format SVG Format
CURL Format CURL Format

Validate Tools

JSON Validate JSON Validate
Email Validate Email Validate
HTML Validate HTML Validate
YAML Validate YAML Validate
XML Validate XML Validate
CSS Validate CSS Validate
SQL Validate SQL Validate
RSS Validate RSS Validate
CSV Validate CSV Validate
UUID Validate UUID Validate
Regex Tester Test regex online

Convert Tools

JSON To CSV JSON to CSV
JSON To Excel JSON to Excel
JSON To SQL JSON to SQL
JSON To YAML JSON to YAML
JSON To XML JSON to XML
JSON To C JSON to C
JSON To String JSON to String
JSON To Table JSON to Table
JSON To TypeScript JSON to TypeScript
JSON To Dart JSON to Dart
JSON To HTML JSON to HTML
JSON To PDF JSON to PDF
CSV To JSON CSV to JSON
XML To JSON XML to JSON
YAML To JSON YAML to JSON
String To JSON String to JSON
Excel To JSON Excel to JSON
HTML To JSON HTML to JSON
Base64 Encoder Decoder Base64 encode/decode
URL Encoder Decoder URL encode/decode
Epoch Timestamp Converter Unix timestamp tool

Minify Tools

CSS Minify CSS Minify
JSON Minify JSON Minify
JS Minify JS Minify
HTML Minify HTML Minify
SQL Minify SQL Minify

Beautify Tools

JSON Beautify JSON Beautify
HTML Beautify HTML Beautify
XML Beautify XML Beautify
SQL Beautify SQL Beautify
JS Beautify JS Beautify
CSS Beautify CSS Beautify

Free Online Code Formatting Tools for Developers

Welcome to TidyCode, your one-stop hub for formatting, validating, converting, minifying, and beautifying code and structured data. Our 60+ free browser-based tools help developers, DevOps engineers, and data analysts work with JSON, HTML, CSS, XML, SQL, YAML, Markdown, TypeScript, Python, and more.

All tools are 100% free, require no registration, and process input securely in your browser. No watermarks, no file limits, unlimited usage.

What Is Code Formatting?

Code formatting (also called beautifying or prettifying) adds indentation, line breaks, and consistent spacing so source is easy to read and debug. Minified JSON from APIs, single-line HTML templates, and compressed CSS bundles become readable in one click. A good online formatter also validates syntax so you catch errors before deployment.

Why Validate Before You Ship?

Invalid JSON breaks API integrations. Malformed HTML hurts SEO and accessibility. Bad YAML fails Kubernetes deployments. Online validators run instantly in the browser, giving line-level feedback without uploading proprietary data to third-party servers.

Developer Tool Categories

Format

Beautify and prettify JSON, HTML, CSS, XML, SQL, YAML, and more with proper indentation

Validate

Check JSON, HTML, XML, CSS, SQL, YAML, email, CSV, and UUID syntax online

Convert

Transform JSON to CSV, XML, YAML, TypeScript, SQL, HTML, PDF, and other formats

Minify

Compress JSON, HTML, CSS, JS, and SQL by removing whitespace for production

Beautify

Expand minified JSON, HTML, CSS, XML, SQL, and JavaScript with readable indentation for review and debugging

Format & Beautify

Turn minified JSON, HTML, CSS, XML, SQL, and YAML into readable, indented code with syntax-friendly layout.

Validate & Lint

Catch syntax errors in JSON, HTML, XML, CSS, SQL, YAML, email addresses, CSV, RSS, and UUID strings.

Convert Data

Move between JSON, CSV, XML, YAML, Excel, HTML, TypeScript, Dart, C, SQL, and PDF without manual scripts.

Client-Side Privacy

Every tool runs in your browser. No server upload, no storage, no account — ideal for sensitive configs and API payloads.

Who Uses TidyCode?

Software Developers

Format API responses, debug JSON configs, and prettify HTML/CSS before code review.

DevOps & SRE

Validate YAML manifests, lint JSON policies, and convert configs between formats.

Data Analysts

Convert JSON to CSV or Excel, inspect nested structures, and clean exported data.

Students & Learners

Understand JSON and XML structure with readable formatting and built-in validation.

Popular Format & Developer Tools

JSON Formatter JSON Validator HTML Formatter CSS Beautifier XML Formatter SQL Formatter YAML Formatter JSON to CSV JSON to XML JSON Minify JavaScript Beautifier HTML Validator Regex Tester URL Encoder Epoch Timestamp

Why Developers Choose TidyCode

Completely Free No subscription, trial, or export fee
No Registration Open the page and start formatting immediately
Browser Privacy Source code never uploads to our servers
Unlimited Use Process as many files as you need
Instant Results No queue or waiting for server processing
Many Formats JSON, HTML, CSS, XML, SQL, YAML, and more
Cross-Platform Works on desktop and mobile browsers
Built for Developers Format, validate, convert, minify, and beautify in one place

Frequently Asked Questions

What is the best free online JSON formatter?

TidyCode offers a fast, private JSON formatter that runs entirely in your browser. It formats, validates, compresses, and converts JSON without uploading data to a server — ideal for API responses and config files.

Is it safe to format code online?

Yes, when the tool processes data client-side in your browser. TidyCode never stores or transmits your input. Your JSON, HTML, CSS, and other source stays on your device.

Which formats does TidyCode support?

We support JSON, HTML, CSS, XML, SQL, YAML, Markdown, TypeScript, Python, Java, Lua, GraphQL, LaTeX, SVG, cURL, and more — plus validate, convert, minify, and beautify variants.

Do I need to install anything?

No. All tools work in modern web browsers without plugins or downloads. Bookmark pages you use often for one-click access.

What is the difference between format, beautify, and minify?

Format and beautify add indentation for readability. Minify removes whitespace to shrink file size for production. Validate checks syntax without changing layout unless errors are fixed.

Can I use TidyCode for API response debugging?

Absolutely. Paste minified API JSON into the JSON Formatter to expand structure, validate syntax, search with JSON Path, or convert to XML, CSV, or YAML.