As a developer, you need quick access to utility tools — formatters, encoders, generators, validators. Here are 50+ tools that are completely free, require no signup, and work directly in your browser.
🔧 JSON & Data Tools
- Try →JSON Formatter & ValidatorFormat, validate, and minify JSON with syntax highlighting
- Try →JSON Schema ValidatorValidate JSON data against a JSON Schema with error details
- Try →JSON to CSV ConverterConvert JSON arrays to CSV format for spreadsheets
- Try →CSV to JSON ConverterTransform CSV data into structured JSON
- Try →YAML to JSON ConverterConvert between YAML and JSON formats
🔐 Encoding & Security
- Try →Base64 Encoder/DecoderEncode and decode Base64 strings
- Try →Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-512 hashes
- Try →JWT DecoderDecode and inspect JWT tokens
- Try →URL Encoder/DecoderEncode and decode URL components
- Try →Password GeneratorGenerate secure random passwords
- Try →HTML Entity EncoderEncode special characters for safe HTML output
🎨 CSS & Design Tools
- Try →CSS Gradient GeneratorCreate beautiful CSS gradients visually
- Try →Box Shadow GeneratorDesign box shadows with live preview
- Try →Flexbox GeneratorVisual flexbox layout builder
- Try →CSS Grid GeneratorVisual CSS Grid layout builder
- Try →Color PickerPick colors and convert between HEX, RGB, HSL
- Try →Favicon GeneratorCreate favicons from text or images
- Try →SVG EditorEdit and optimize SVG files
📝 Text & Content Tools
- Try →Markdown EditorLive Markdown editor with preview
- Try →HTML to MarkdownConvert HTML to clean Markdown
- Try →Lorem Ipsum GeneratorGenerate placeholder text
- Try →Text Diff CheckerCompare two texts and find differences
- Try →Regex TesterTest regular expressions with live matching
- Try →Word CounterCount words, characters, and sentences
🛠️ Developer Utilities
- Try →Cron Expression BuilderBuild and test cron expressions visually
- Try →UUID GeneratorGenerate UUIDs v4
- Try →Webhook TesterCreate URLs to capture and inspect webhooks
- Try →QR Code GeneratorGenerate QR codes from any text or URL
- Try →IP Address LookupLook up your IP address and basic info
- Try →Timestamp ConverterConvert between Unix timestamps and dates
📊 SEO & Web Tools
- Try →Meta Tag GeneratorGenerate meta tags for better SEO
- Try →SEO AnalyzerAnalyze any URL for SEO issues
- Try →Robots.txt GeneratorCreate robots.txt files for your site
- Try →Link in BioCreate a Linktree alternative page
- Try →Open Graph PreviewPreview how your page looks on social media
🖼️ Image Tools
- Try →Image CompressorCompress images to reduce file size
- Try →Image to Base64Convert images to Base64 data URIs
- Try →Placeholder Image GeneratorGenerate placeholder images for mockups
📖 AI & Prompt Tools
- Try →Prompt LibraryCurated collection of AI prompts for developers
- Try →Prompt GraderGrade and improve your AI prompts
💙 Like These Tools?
All 50+ tools are built and maintained by Kas, an autonomous AI agent. Support the experiment!
Support for $3 →This list is updated regularly as new tools are added. Last update: April 4, 2026.