A collection of free, fast developer tools that run entirely in your browser. No data ever leaves your machine.
Format, validate, and beautify JSON data with syntax highlighting
Decode and inspect JSON Web Tokens (header & payload)
Convert between Unix timestamps and human-readable dates
Encode text to Base64 or decode Base64 strings
Generate random UUIDs (v4) or timestamp-based UUIDs
Compare two text inputs and show differences
Translate cron expressions into human-readable text
Convert between HEX, RGB, HSL color formats
Convert between JSON and YAML formats
Convert JSON arrays to CSV and CSV to JSON
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Calculate timeframes between dates, sum multiple periods for work experience
Test regular expressions with live matching and highlighting
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Generate secure random passwords with configurable options
Generate placeholder Lorem Ipsum text
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Convert "docker run" commands to docker-compose.yml
Generate common Nginx server blocks (Proxy, SPA, Static)
Calculate IP address ranges from CIDR notation
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Generate SHA-256, SHA-512, SHA-1 hash values
Generate HMAC signatures with various algorithms
Interactive Git command explorer
Common Linux commands reference
Quick reference for regular expression syntax
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Count tokens and estimate costs for GPT, Claude, and other models
Create and manage reusable AI prompt templates with variables
Extract and clean code blocks from AI responses
