free developer tools online
Developer Tools
Format, validate, convert, encode, decode, and generate developer-friendly data without opening a full IDE. These tools are made for fast debugging and cleanup.
14 tools available
Popular developer tools
Instantly format, minify, and validate JSON data online. Find syntax errors quickly without sending data to a server. 100% free and secure.
Bulk UUID & GUID Generator OnlineInstantly generate up to 10,000 cryptographically secure UUIDs or GUIDs in bulk. Customize formats, remove hyphens, and export directly as .txt for your database.
What you can do with these tools
- Format JSON, CSS, HTML, SQL, and JavaScript
- Encode URLs or Base64
- Generate UUIDs and mock data
- Compare text or code changes
All developer tools
Base64 Encoder & Decoder
Instantly encode and decode text or images to Base64 format. Features drag-and-drop file support for converting images to Base64 Data URIs safely in your browser.
✓ On-deviceOpen tool →CSS Minifier & Formatter
Instantly compress CSS code to save bandwidth and improve page speeds, or beautify messy CSS into readable code. Free online developer utility.
✓ On-deviceOpen tool →CSV to JSON Converter
Instantly convert CSV spreadsheet data into a formatted JSON array. 100% secure, processed entirely in your browser.
✓ On-deviceOpen tool →Diff Checker
Compare two blocks of text or code side-by-side to instantly highlight additions, deletions, and changes. Free online diff tool.
✓ On-deviceOpen tool →Fake Data Generator
Instantly generate massive amounts of mock data (JSON/CSV) for testing your applications, databases, and APIs.
✓ On-deviceOpen tool →HTML Formatter
Instantly beautify and format messy or minified HTML code. Adds proper indentation and line breaks for perfect readability.
✓ On-deviceOpen tool →JavaScript Minifier & Formatter
Instantly compress JavaScript code to save bandwidth and improve page speeds, or beautify messy JS into readable code. Free online developer utility.
✓ On-deviceOpen tool →JSON Formatter, Validator & Minifier Online
Instantly format, minify, and validate JSON data online. Find syntax errors quickly without sending data to a server. 100% free and secure.
✓ On-deviceOpen tool →JSON Formatter & Validator
Instantly validate, format, beautify, and minify JSON strings. Catch syntax errors before they break your app with our free JSON validator.
✓ On-deviceOpen tool →Regex Tester
Test regular expressions against strings directly in your browser. A free tool for developers to debug and validate regex patterns instantly.
✓ On-deviceOpen tool →SQL Formatter
Instantly beautify and format messy SQL queries. Adds proper indentation, line breaks, and capitalization for maximum readability.
✓ On-deviceOpen tool →URL Encoder, Decoder & Query Parser Online
Instantly encode or decode URL parameters and tracking links. Features an intelligent URL Parser that extracts and formats query strings into an easy-to-read table.
✓ On-deviceOpen tool →Bulk UUID & GUID Generator Online
Instantly generate up to 10,000 cryptographically secure UUIDs or GUIDs in bulk. Customize formats, remove hyphens, and export directly as .txt for your database.
✓ On-deviceOpen tool →XML to JSON Converter
Instantly convert legacy XML data formats into formatted JSON objects. 100% secure, processed entirely in your browser.
✓ On-deviceOpen tool →Developer Tools FAQ
Which developer tools are most useful daily?
JSON Formatter, URL Encoder, UUID Generator, Diff Checker, and SQL Formatter are strong everyday utilities.
Can these tools help with debugging?
Yes. Validators, formatters, encoders, and diff tools make common debugging tasks faster.