Tidy Code – Free Online 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 Format Tools

Paste text, pick a tab, and get the result instantly. Everything runs in your browser - nothing is uploaded.

Paste minified JSON below and format instantly in your browser.

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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, and no usage counter 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.

76+ 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

76+ free developer tools available

Last updated: October 18, 2026

Format Tools

JSON Formatter JSON Formatter is a browser-based tool for formatting and beautifying JSON. Paste your input, review the… Open
XML Formatter XML Formatter is a browser-based tool for formatting and beautifying XML. Paste your input, review the… Open
HTML Formatter HTML Formatter is a browser-based tool for formatting and beautifying HTML. Paste your input, review the… Open
SQL Formatter SQL Formatter is a browser-based tool for formatting and beautifying SQL. Paste your input, review the… Open
TypeScript Formatter TypeScript Formatter is a browser-based tool for formatting and beautifying TypeScript. Paste your input… Open
CSS Formatter CSS Formatter is a browser-based tool for formatting and beautifying CSS. Paste your input, review the… Open
Markdown Formatter Markdown Formatter is a browser-based tool for formatting and beautifying Markdown. Paste your input, review… Open
GraphQL Formatter GraphQL Formatter is a browser-based tool for formatting and beautifying GraphQL. Paste your input, review… Open
YAML Formatter YAML Formatter is a browser-based tool for formatting and beautifying YAML. Paste your input, review the… Open
Python String Formatter Python String Formatter is a browser-based tool for formatting and beautifying Python. Paste your input… Open
LaTeX Formatter LaTeX Formatter is a browser-based tool for formatting and beautifying LaTeX. Paste your input, review the… Open
Java String Formatter Java String Formatter is a browser-based tool for formatting and beautifying Java. Paste your input, review… Open
Lua String Formatter Lua String Formatter is a browser-based tool for formatting and beautifying Lua. Paste your input, review… Open
SVG Formatter SVG Formatter is a browser-based tool for formatting and beautifying SVG. Paste your input, review the… Open
CURL Formatter cURL Formatter is a browser-based tool for formatting and beautifying cURL. Paste your input, review the… Open

Validate Tools

JSON Validator JSON Validator is a browser-based tool for validating JSON syntax. Paste your input, review the result, and… Open
Email Validator Email Validator is a browser-based tool for validating Email syntax. Paste your input, review the result… Open
HTML Validator HTML Validator is a browser-based tool for validating HTML syntax. Paste your input, review the result, and… Open
YAML Validator YAML Validator is a browser-based tool for validating YAML syntax. Paste your input, review the result, and… Open
XML Validator XML Validator is a browser-based tool for validating XML syntax. Paste your input, review the result, and… Open
CSS Validator CSS Validator is a browser-based tool for validating CSS syntax. Paste your input, review the result, and… Open
SQL Validator SQL Validator is a browser-based tool for validating SQL syntax. Paste your input, review the result, and… Open
RSS Validator RSS Validator is a browser-based tool for validating RSS syntax. Paste your input, review the result, and… Open
CSV Validator CSV Validator is a browser-based tool for validating CSV syntax. Paste your input, review the result, and… Open
UUID Validator UUID Validator is a browser-based tool for validating UUID syntax. Paste your input, review the result, and… Open
Regex Tester Test regex online Open

Convert Tools

JSON to CSV Converter JSON to CSV Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
JSON to Excel Converter JSON to Excel Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to SQL Converter JSON to SQL Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
JSON to YAML Converter JSON to YAML Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to XML Converter JSON to XML Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
JSON to C Converter JSON to C Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
JSON to String Converter JSON to String Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to Table Converter JSON to Table Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to TypeScript Converter JSON to TypeScript Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to Dart Converter JSON to Dart Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to HTML Converter JSON to HTML Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
JSON to PDF Converter JSON to PDF Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
CSV to JSON Converter CSV to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
XML to JSON Converter XML to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the result… Open
YAML to JSON Converter YAML to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
String to JSON Converter String to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
Excel to JSON Converter Excel to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
HTML to JSON Converter HTML to JSON Converter is a browser-based tool for converting JSON data. Paste your input, review the… Open
Base64 Encoder and Decoder Base64 encode/decode Open
URL Encoder and Decoder URL encode/decode Open
Unix Timestamp Converter Unix timestamp tool Open

Minify Tools

SQL Minifier SQL Minifier is a browser-based tool for minifying SQL source. Paste your input, review the result, and copy… Open

Beautify Tools

JavaScript Beautifier JavaScript Beautifier is a browser-based tool for beautifying JavaScript code. Paste your input, review the… Open

Browser-only tools

JSONL Validator Validate, format and convert JSON Lines in your browser. Open
.env Validator Check .env files for common syntax mistakes and format them safely in your browser. Open
SRT to VTT Converter Convert SubRip subtitle files to WebVTT subtitles in your browser. Open
VTT to SRT Converter Convert WebVTT subtitles to SubRip subtitles without uploading the file. Open
CSV to Markdown Converter Turn CSV data into a clean Markdown table in your browser. Open
Markdown Table to CSV Convert a Markdown table into CSV text locally in your browser. Open
Query String to JSON Parse URL query parameters into readable JSON without sending the URL anywhere. Open
JSON to Query String Convert a flat JSON object into an encoded URL query string in your browser. Open
JSON Schema Validator Validate JSON against a practical browser-based JSON Schema subset. Open
TOML Formatter and Validator Check and tidy common TOML configuration files locally in your browser. Open
Docker Compose Formatter Format and inspect Docker Compose YAML in your browser. Open
JSONPath Extractor Extract values from JSON with common JSONPath expressions in your browser. Open
JSONL to CSV Converter Convert object-based JSON Lines into CSV locally in your browser. Open
CSV Normalizer Detect CSV delimiters, normalize line endings and remove a UTF-8 BOM in your browser. Open
XML to CSV Converter Convert repeated XML child elements into CSV rows in your browser. Open
Subtitle to Text Converter Remove subtitle numbering and timestamps from SRT or VTT files in your browser. Open
Subtitle Timing Shifter Shift SRT or VTT subtitle timestamps forward or backward in your browser. Open
Remove Image Metadata Re-encode an image in your browser to remove common EXIF and GPS metadata. Open
File Hash Checker Calculate SHA-1, SHA-256, SHA-384 or SHA-512 checksums locally in your browser. Open
Favicon Generator Create common PNG favicon and web app icon sizes from an image in your browser. Open
robots.txt Generator Build a simple robots.txt file and sitemap URL list in your browser. Open
Cron Expression Builder Build and explain common five-field cron expressions in your browser. Open
JSON Duplicate Key Checker Find duplicate object keys that a normal JSON parser may silently overwrite. Open
JSON Flatten and Unflatten Flatten nested JSON into paths or rebuild a nested object in your browser. Open
Duplicate Lines Remover Remove duplicate lines, trim whitespace and sort text locally in your browser. Open
.gitignore Tester Test common .gitignore patterns against file paths in your browser. Open
File Type Inspector Inspect a file name, extension and common magic bytes locally in your browser. Open

Free Online Code Formatting Tools for Developers

Welcome to TidyCode, a browser-based toolkit for formatting, validating, converting, minifying, and beautifying code and structured data. Explore practical tools for JSON, HTML, CSS, XML, SQL, YAML, Markdown, TypeScript, Python, and more.

The tools are free to use, require no registration, and process supported input in your browser. There are no watermarks or usage counters; browser and per-tool file-size limits still apply.

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

Who Uses TidyCode?

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

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

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

Frequently Asked Questions

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.