Free Developer Tools
A growing collection of free, fast, browser-based tools. No signup, no ads, no limits.
JSON
JSON Formatter
Format, validate, and beautify JSON with syntax highlighting
JSON → TypeScript
Convert JSON to TypeScript interface and type definitions
JSON → Zod Schema
Generate Zod validation schemas from any JSON object
JSON → YAML
Convert JSON objects to clean, readable YAML format
YAML → JSON
Parse YAML and convert it to formatted JSON with validation
Encoding
Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 back to text
URL Encoder / Decoder
Encode or decode URLs and URI components instantly
HTML Encoder / Decoder
Encode or decode HTML entities in text
JWT Decoder
Decode and inspect JWT tokens without verification
Network
cURL → Fetch
Convert cURL commands to JavaScript fetch() calls instantly
cURL → Axios
Convert cURL commands to Axios request code in seconds
HTTP Headers Viewer
View HTTP response headers for any URL
User-Agent Parser
Parse and decode user-agent strings
Screen Resolution Tester
Test and display current screen resolution details
Converter
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa
ENV to JSON
Convert .env files to JSON format
ENV to Docker Compose
Convert .env files to docker-compose environment snippet
Query String to JSON
Parse URL query strings into JSON objects
JSON to Query String
Convert JSON objects to URL query strings
CSV to JSON
Convert CSV data to JSON array format
JSON to CSV
Convert JSON arrays to CSV format
Formatter
Text
SEO
Meta Tag Generator
Generate HTML meta tags for SEO
OpenGraph Tag Generator
Generate OpenGraph meta tags for social sharing
robots.txt Generator
Generate robots.txt files for search engine crawlers
sitemap.xml Generator
Generate XML sitemaps for search engines
Canonical Tag Generator
Generate canonical link tags to prevent duplicate content
FAQ Schema Generator
Generate FAQ structured data (JSON-LD) for rich results
HowTo Schema Generator
Generate HowTo structured data (JSON-LD) for rich results
Breadcrumb Schema Generator
Generate BreadcrumbList structured data (JSON-LD)
Export
Markdown Preview
Render Markdown as a shareable preview page
Code to Image
Convert code snippets to beautiful images via canvas
JSON Visual Tree
Visualize JSON data as an interactive tree
Text to File
Download text as .txt, .md, or .json files
OG Image Generator
Generate Open Graph images using Satori in Next.js
AI
llms.txt Generator
Generate llms.txt files for LLM crawler guidance
ai.txt Generator
Generate ai.txt files for AI bot permissions
AI Content Chunking Preview
Preview how AI models chunk your content
AI Readability Score
Calculate rule-based readability scores for your content
Content
Heading Structure Analyzer
Analyze the heading hierarchy of your content
Keyword Density Checker
Analyze keyword frequency and density in text
Internal Linking Suggester
Suggest internal linking opportunities from your content
Entity Frequency Counter
Count and analyze entity frequencies in text
Passage Extractor
Extract key passages optimized for featured snippets
Content Word Statistics
Get detailed word and reading statistics for your content
Image
Image to Base64
Convert images to Base64-encoded data URIs
Base64 to Image
Convert Base64 strings back to downloadable images
Image Resizer
Resize images client-side with custom dimensions
Image Cropper
Crop images with a visual selection tool
Image Format Converter
Convert images between PNG, WebP, and JPEG formats
Image Color Palette Extractor
Extract dominant colors from any image
Favicon Generator
Generate favicons in multiple sizes from an image
SVG Optimizer
Optimize SVG files by removing unnecessary data
SVG to JSX
Convert SVG markup to JSX-compatible React components
Blur Placeholder Generator
Generate blurred placeholder images for next/image