Free Online Developer Tools
Fast, secure, and private — every tool runs entirely in your browser. Your data never touches any server.
100% Privacy First
All tools run client-side. Your data never leaves your browser — no servers, no storage, no tracking.
Fast & Lightweight
Built with Next.js and deployed on Vercel's global edge network. No sign-ups, no bloat, instant loading.
Free Forever
No paywalls, no premium tiers, no hidden costs. Every tool is completely free to use, forever.
All Tools
JSON Formatter
Format, compress and validate JSON data with syntax highlighting and error detection
Base64 Encode / Decode
Encode and decode Base64 strings — supports Chinese, Unicode and special characters
Regex Tester
Test and debug regular expressions in real-time with live match highlighting
UUID Generator
Generate random UUIDs (v4) in bulk — copy with one click
Timestamp Converter
Convert between Unix timestamps and human-readable dates in multiple formats
Color Converter
Convert colors between HEX, RGB, HSL and HSL — with live preview
URL Encoder / Decoder
Encode and decode URL components — perfect for query string manipulation
JWT Decoder
Decode and inspect JWT tokens — view header, payload and signature info
AI ID Photo
Remove background and create standard ID photos (1-inch, 2-inch) — runs locally in your browser
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Compare REST and GraphQL: endpoints vs single schema, over-fetching, caching, versioning, N+1 resolvers, and when to choose each.
JWT vs OAuth2: What's the Difference and When to Use Each?
Compare JWT (token format) vs OAuth2 (authorization framework): roles, scopes, flows, and how they work together for third-party login.
SQL vs NoSQL: Which Database Should You Choose in 2026?
Compare relational vs non-relational databases: schema, ACID transactions, horizontal scaling, and when to choose each for your project.
JWT vs Session: Which Authentication Method Should You Use?
Compare stateless JWT vs stateful sessions: scalability, security, CSRF protection, revocation, and when to choose each for your project.
JSON vs YAML: Which Data Format Should You Use?
Compare JSON and YAML for config files and APIs: readability, comments, anchors, parse speed, and when to choose each format.
SQL Query Cheat Sheet for Developers
Essential SQL query reference. SELECT, JOIN, GROUP BY, window functions, subqueries, and query optimization tips for daily development.
JavaScript Array Methods Cheat Sheet
Complete JavaScript array methods reference with examples. From map() and filter() to flatMap() and toSorted() — every ES6+ method explained.
HTML Entities Reference: Complete List of Escape Codes
Complete HTML entities reference with escape codes. Find common symbols, special characters, currency signs, and mathematical operators.
HTTP Status Codes Cheat Sheet: Every Developer Should Know
Complete HTTP status code reference. Every response code explained — 1xx informational, 2xx success, 3xx redirect, 4xx client error, 5xx server error.
Git Commands Cheat Sheet: From Beginner to Advanced
Essential Git commands reference for daily development. From git init to interactive rebase — commands, options, and practical examples.
CSS Units Cheat Sheet: px, em, rem, vw, vh and Beyond
Complete CSS units reference — absolute vs relative, viewport units, calc(), and when to use each. Includes responsive design patterns.
Cron Expression Guide: Every Schedule Pattern Explained
Master cron expressions with this complete guide. Syntax, special strings, 25+ common schedule examples, troubleshooting, and cloud-specific formats.
5 Developer Tools That Respect Your Privacy
Discover privacy-first developer tools that run entirely in your browser — no server uploads, no data collection, no tracking.
UUID v4 vs UUID v7: Which One Should You Use?
Compare random vs time-ordered UUIDs, database index performance, and when to choose each for your project.
How to Decode JWT Tokens Without a Backend
Learn to inspect JWT tokens client-side. Understand headers, claims, signatures, and security pitfalls.
Unix Timestamp Cheat Sheet for Developers
Master timestamps: seconds vs ms, timezone gotchas, JWT exp checks, and one-liners for 8 languages.
10 Free Online Developer Tools to Supercharge Your Workflow in 2026
Discover essential free developer tools for 2026 — from JSON formatting to regex testing. All are privacy-first and run locally in your browser.
JSON Formatting 101: How to Debug JSON Data Like a Pro
Master JSON formatting, validation, and debugging. Learn common mistakes, best practices, and how to use a JSON formatter effectively.
Base64 Encoding & Decoding: What Every Developer Needs to Know
Learn how Base64 works, when to use it, and browser pitfalls. Includes practical examples with data URLs, JWT tokens, and Unicode handling.
The Complete Guide to Writing Better Regular Expressions
Practical regex patterns, named capture groups, common traps like catastrophic backtracking, and debugging techniques for daily use.