All Developer Tools

Browse our complete collection of 20 free online developer tools. All tools run directly in your browser for complete privacy and security.

JSON Tools

JSON Formatter

Format, validate, minify, and beautify JSON with error detection

Try it now

UUID Tools

UUID Generator

Generate RFC 4122 compliant UUIDs in multiple versions (v1, v3, v4, v5, v7, NIL) for databases, APIs, and distributed systems

Try it now

UUID Validator

Validate RFC 4122 compliant UUIDs instantly, check format correctness, determine version, and verify basic structural integrity

Try it now

UUID Decoder & Analyzer

Decode and analyze UUIDs to extract detailed information including version, variant, timestamp, node ID, and clock sequence data

Try it now

UUID Format Converter

Convert UUIDs between formats (hyphens, uppercase, URN, etc.)

Try it now

Encoding Tools

Base64 Encoder/Decoder

Encode and decode Base64 strings for data transmission, encoding binary data, and working with APIs that require Base64 format

Try it now

URL Encoder/Decoder

Encode and decode URLs with percent encoding for safe transmission of special characters in web addresses and query parameters

Try it now

HTML Encoder/Decoder

Convert special characters to HTML entities and decode them back to plain text for XSS prevention, displaying code snippets, and safe character rendering

Try it now

Regex Tools

Regex Tester

Test and debug regular expressions with real-time pattern matching, capture groups, and detailed match highlighting for any text input

Try it now

Color Tools

Color Picker

Pick colors, convert formats (HEX, RGB, HSL), and generate palettes

Try it now

Color Palette Generator

Generate beautiful color palettes using color theory harmonies

Try it now

Gradient Generator

Create stunning CSS gradients with 45+ presets and custom options

Try it now

Text Tools

Lorem Ipsum Generator

Generate classic placeholder text for designs, mockups, and prototypes

Try it now

Text Diff

Compare text differences side-by-side with highlighted additions, deletions, and changes for easy code review and document comparison

Try it now

Markdown Previewer

Live markdown editor with instant preview, GitHub-flavored markdown support, syntax highlighting, and export to HTML for documentation and content creation

Try it now

Time Tools

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa, supporting milliseconds and multiple timezone formats instantly

Try it now

JWT Tools

JWT Decoder

Decode and inspect JSON Web Tokens (JWT) to view headers, payloads, and signatures for debugging authentication and authorization

Try it now

Security Tools

Hash Generator

Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) and HMAC for data integrity, password hashing, and checksums with instant browser-based processing

Try it now

CSS Tools

CSS Minifier/Beautifier

Minify CSS to reduce file size or beautify for readability with instant formatting, comment preservation options, and zero data transmission

Try it now

Image Tools

QR Code Generator

Generate customizable QR codes for URLs, text, vCards, WiFi, email, and SMS with color options, logo support, error correction levels, and instant download in PNG or SVG

Try it now

Frequently Asked Questions

Are these developer tools completely free to use?

Yes, all 20 developer tools on DeveloperUtilityTools are completely free to use with no registration, sign-up, or payment required. You can access any tool instantly and use it as many times as you need.

Do these tools store my data or send it to a server?

No. All tools run entirely in your browser using client-side JavaScript. Your data never leaves your computer and is not sent to any server. This ensures complete privacy and security when working with sensitive information like JSON data, UUIDs, or encoded strings.

Can I use these tools offline?

Once you load a tool page in your browser, it will continue to work even if your internet connection is lost. The tools are designed to function entirely client-side, so you can use them offline after the initial page load.

What types of developer tools are available?

We offer tools across multiple categories: JSON tools (formatter, validator), UUID tools (generator, validator, decoder, format converter), encoding tools (Base64, URL encoder/decoder), regex testing, color picking, text generation, timestamp conversion, text comparison, and JWT decoding. Each tool is designed for common web development tasks.

Do I need to install anything to use these tools?

No installation required. All tools are web-based and work directly in your browser. Simply visit the tool page and start using it immediately. The tools are compatible with all modern browsers including Chrome, Firefox, Safari, and Edge.

How do the UUID tools comply with RFC 4122 standards?

Our UUID generator creates standards-compliant UUIDs according to RFC 4122 specifications, supporting versions 1, 3, 4, and 5, plus the NIL UUID. The UUID validator, decoder, and format converter also follow RFC 4122 standards to ensure compatibility with all systems that use UUIDs.

Can the JSON formatter handle large JSON files?

Yes, the JSON formatter can handle large JSON files since it runs in your browser and uses your computer's resources. However, extremely large files (multiple megabytes) may take longer to process depending on your device's performance.

Are the tools mobile-friendly?

Yes, all developer tools are fully responsive and work on mobile devices, tablets, and desktops. The interface adapts to your screen size for optimal usability on any device.