Developer Tools
Essential online tools for developers and programmers. JSON formatter & validator, Base64 encoder/decoder, UUID generator, hash generator, regex tester, DNS lookup, and more. 100% free, browser-based, no installation required.
Text Compare
Compare two texts side-by-side with real-time diff highlighting
Line Break Remover
Cleans up text by removing extra line breaks and spaces
Slug Generator
Generate SEO-friendly URL slugs from any text
Remove Duplicate Lines
Instantly remove repeated lines with flexible dedup modes
Text Sorter
Sort text alphabetically, by length, numerically, or randomly
Text to ASCII
Convert text to ASCII decimal, hex, binary, or octal codes
ASCII to Text
Convert ASCII codes back to readable text with error reporting
Lorem Ipsum Generator
Generate placeholder text as paragraphs, sentences, or words
Random Text Generator
Generate random words, sentences, names, numbers, and more
File Share
Upload a file and generate a shareable link
Extract PDF Metadata
View and extract metadata from PDF documents
Color Picker
Identify and extract hex codes of colors from an uploaded image
Safe Link Checker
Check if a URL is safe and free from malware
Code Formatter
Beautify or minify HTML, CSS, and JavaScript code
URL Encoder / Decoder
Encode or decode URLs with percent-encoding instantly
Redirect Checker
Trace URL redirect chains and see every hop with status codes
Meta Tag Generator
Generate SEO meta tags, Open Graph, and Twitter Card tags
Robots.txt Generator
Create robots.txt files to control search engine crawling
Sitemap Generator
Generate valid XML sitemaps with priority and change frequency
URL Parser
Break down and analyze URLs into protocol, host, path, query, and more
HTTP Header Checker
View HTTP response headers and security analysis for any URL
SVG to PNG Converter
Convert SVG vector files to high-quality PNG images with custom scale and backgrounds
CSS Gradient Generator
Create stunning linear, radial, and conic CSS gradients with a visual editor
Favicon Generator
Generate favicons from text, emoji, or images — all sizes from 16px to 512px
SVG Optimizer
Minify and clean SVG files by removing metadata, comments, and unnecessary elements
Box Shadow Generator
Design CSS box shadows visually with multiple layers, presets, and live preview
Glassmorphism Generator
Create frosted glass CSS effects with customizable blur, transparency, and borders
Neumorphism Generator
Create soft UI neumorphism effects with flat, concave, convex, and pressed styles
JSON Formatter
Validate, format, and view JSON data in a clean tree structure
JSON Generator
Create, format, and validate JSON data with sample data generation
Base64 Encoder/Decoder
Quickly encode data to Base64 or decode it back
UUID Generator
Generate universally unique identifiers (UUIDs)
Hash Generator
Create MD5, SHA-1, and SHA-256 hashes from any text
Regex Tester
Build and test regular expressions in real-time
My IP Address
Instantly check your public IP address
DNS Lookup
Perform a DNS lookup to check records for any domain
Public API Finder
A curated list of free public APIs for projects
Website Status Checker
Check if a website is down or responding globally
CSV to JSON Converter
Convert CSV data to structured JSON format instantly
JSON to YAML Converter
Convert JSON data to clean, readable YAML format
YAML to JSON Converter
Convert YAML config files to standard JSON format
XML Formatter
Format, validate, and beautify XML data
XML to JSON Converter
Convert XML documents to clean JSON format
JSON Diff Tool
Compare two JSON objects and highlight differences
Password Generator
Create strong, random, and secure passwords
Text Encryptor
Encrypt and decrypt text messages with a password
Fake Data Generator
Generate fake names, addresses, and emails for testing
Email Verifier
Check if an email address is valid and can receive mail
IP Address Info
Get location and other details about an IP address
JWT Decoder
Decode and inspect JSON Web Token header, payload, and claims
JWT Generator
Create signed JWT tokens with custom claims and HMAC algorithms
Hash Compare
Compare hash values or generate MD5, SHA-256, SHA-512 hashes
UUID Validator
Validate UUID format, detect version, and generate new UUIDs
JWT Expiry Checker
Check JWT expiration with live countdown and lifespan tracking
URL & Email Extractor
Pull all URLs or email addresses from a block of text
Developer Tools
Our comprehensive collection of free online developer tools is built for programmers, web developers, and software engineers. From JSON formatting and validation to Base64 encoding, hash generation, and regex testing, we provide essential utilities that streamline your development workflow.
Key Features of Developer Tools
Everything you need for professional developer tools
Data Formatting
Format and validate JSON, convert between data formats, beautify or minify code
Encoding & Hashing
Base64 encoding/decoding, MD5/SHA hash generation for security and data integrity
Privacy First
All processing happens in your browser - your data never leaves your device
Instant Results
Real-time processing with no delays - see results as you type
Multiple Formats
Support for JSON, CSV, Base64, UUID, regex, and various encoding formats
Always Free
All developer tools are completely free with no limitations or hidden fees
How to Use Developer Tools
Follow these simple steps to get started
Select Your Tool
Choose from JSON formatter, Base64 encoder, UUID generator, hash generator, regex tester, DNS lookup, or other developer utilities
Input Your Data
Paste your JSON, text, code, or enter the data you want to process. Most tools provide real-time validation
Get Instant Results
View formatted output, copy results, download files, or use the generated data directly in your projects
Pro Tips
- Use JSON formatter to validate API responses and debug issues
- Generate UUIDs for database primary keys and unique identifiers
- Test regex patterns with multiple test cases before implementation
- Use hash generator to verify file integrity and create checksums
- Check DNS records to troubleshoot domain configuration issues
Explore More Tools
Discover other powerful tools to boost your productivity
Frequently Asked Questions
Everything you need to know about Developer Tools
Yes! All our developer tools including JSON formatter, Base64 encoder/decoder, UUID generator, hash generator, regex tester, DNS lookup, IP checker, JSON generator, and JSON to CSV converter are 100% free with no hidden charges.
Our JSON formatter validates, beautifies, and minifies JSON data in real-time. It checks for syntax errors, displays data in a tree structure, and highlights invalid JSON.
Base64 is an encoding scheme that converts binary data into ASCII text format. Use it to embed images in HTML/CSS, encode data in URLs, or transmit binary data over text-based protocols.
Our hash generator creates MD5, SHA-1, SHA-256, and SHA-512 hashes entirely in your browser - no data is sent to servers.
UUID (Universally Unique Identifier) is a 128-bit number guaranteed to be unique. Developers use UUIDs for database primary keys, API request IDs, session tokens, and distributed system identifiers.
Our regex tester lets you write, test, and debug regex patterns in real-time with multiple test strings. See matches, groups, and explanations instantly.
Most developer tools work offline after initial page load: JSON formatter, Base64 encoder/decoder, UUID generator, hash generator, and regex tester all run entirely in your browser.
Absolutely! All developer tools are free for personal and commercial use without restrictions.
Still need help?
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Contact SupportDeveloper Tools
Free developer tools: JSON formatter, Base64 encoder, UUID generator, hash generator, regex tester, DNS lookup & more. No signup required.
About Developer Tools on Rune
Developer tools on Rune include JSON formatting, Base64 encoding, UUID generation, regex testing, hash generation, and more. These are the quick-access utilities that every developer reaches for between coding sessions.
Instead of hunting through bookmarks or installing CLI tools, open the tool you need, paste your input, and get your result. These tools are built by developers for developers, with keyboard shortcuts and clean output you can copy in one click.
What You Can Do with Developer Tools
- Format, validate, and minify JSON with syntax highlighting and error detection
- Encode and decode Base64 strings for API payloads and data transfer
- Generate UUIDs, hashes, and random data for testing and development
- Test regular expressions with real-time matching, grouping, and explanation
- Look up DNS records, check HTTP headers, and inspect network details
Why Use Rune for Developer Tools
Developer tools on Rune are designed for speed. No ads blocking the interface, no sign-up gates, no rate limits on free usage. Paste your data, get your result, and move on. Every tool runs client-side so your code and data stay on your machine.
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Explore all 55 developer tools available on Rune, all free, private, and ready to use. Browse all tools