Free Developer Tools
Instant tools for developers and AI agents. No signup. No accounts. No tracking. Just tools that work.
LLM Token Counter
Count tokens and estimate API costs for Claude, GPT-4o, Gemini, Mistral and more. See which models your text fits in.
JWT Decoder
Decode and inspect any JWT token instantly. See header, payload, claims, expiry time, and algorithm — no secret needed.
JSON Formatter
Beautify or minify JSON with syntax highlighting, error detection, and stats. Keyboard shortcut Ctrl+Enter to format.
Base64 Encoder / Decoder
Encode text or files to Base64 and decode Base64 strings. Supports URL-safe mode and file-to-data-URI conversion.
Regex Tester
Test regular expressions with real-time match highlighting, capture group display, and replace preview. Includes common patterns.
Cron Generator
Build cron expressions with a visual interface or parse any existing cron expression. Shows plain-English description and next run times.
Fake Data Generator
Generate realistic test data: names, emails, addresses, companies, UUIDs, colors and more. JSON output with reproducible seeds.
DNS Lookup
Query A, AAAA, MX, TXT, NS, CNAME, SOA and PTR records for any domain. Instant results via our server-side resolver.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly. All hashing runs client-side via Web Crypto API.
URL Encoder / Decoder
Percent-encode URLs and query strings, or decode %XX sequences. Supports encodeURIComponent and encodeURI modes.
Password Generator
Generate cryptographically secure random passwords. Choose length, character sets, and generate up to 10 at once.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Live clock, ISO 8601, UTC, local time, and relative display.
UUID Generator
Generate UUID v4 identifiers instantly. Bulk generate up to 100. Supports uppercase, no-hyphens, and brace formats.
HTTP Status Codes
Complete reference for all HTTP status codes — 1xx to 5xx. Searchable with explanations and "when to use" tips.
Git Cheat Sheet
Complete git commands reference with examples — setup, branching, merging, rebasing, stashing, undoing mistakes.
SQL Cheat Sheet
SQL commands with examples — SELECT, JOIN types, GROUP BY, window functions, CTEs, indexes. Works with PostgreSQL, MySQL, SQLite.
Docker Cheat Sheet
Complete Docker commands reference — containers, images, volumes, networks, Docker Compose, Dockerfile, and debugging.
Linux Commands Cheat Sheet
Bash and Linux commands with examples — file operations, permissions, grep, awk, sed, processes, networking, and shell scripting.
LLM Cost Calculator
Compare API costs for GPT-4o, Claude, Gemini, DeepSeek, and 14+ other LLMs. Enter your token usage and find the cheapest model.
MCP Server Directory
Setup guides and configs for 20+ Model Context Protocol servers — filesystem, GitHub, Postgres, Brave Search, and more.
Also available as a free REST API
All tools are accessible programmatically — perfect for AI agents, scripts, and CI pipelines. No API key needed.
Need higher limits?
10,000 API requests/day · Bulk generation up to 500 items · Priority support · No attribution
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