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</> 18 FREE DEV UTILITIES ZERO TELEMETRY • CLIENT-SIDE EXECUTION

FREE ONLINE DEVELOPER TOOLS

Essential engineering utilities designed for modern web developers. Inspect JWTs, format JSON, test regular expressions, generate UUIDs, encode Base64, and convert timestamps without exposing private tokens to remote servers.

All Developer Tools

🛠️ Data
JSON Formatter & Validator
Format, validate, prettify, and minify raw JSON with live syntax error detection and tree view.
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🎫 Security
JWT Decoder
Decode JSON Web Token headers, payload claims, and expiration timestamps locally and securely.
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🔐 Encoding
Base64 Encoder & Decoder
Encode strings into Base64 or decode Base64 data back to clear text with UTF-8 support.
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🌐 Web
URL Encoder & Decoder
Encode or decode query strings and special characters using standard URI percent-encoding.
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🎲 Generators
UUID Generator
Generate cryptographically random Version 4 UUID / GUID strings in single or bulk quantities.
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#️⃣ Crypto
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes for text and passwords.
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📱 Generators
QR Code Generator
Create custom QR codes for URLs, text, Wi-Fi passwords, and contact cards with PNG downloads.
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🧪 Testing
Regex Tester
Test and validate regular expressions with live syntax highlighting and capture group details.
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🗜️ Optimize
Code Minifier
Minify HTML, CSS, and JavaScript source code to strip whitespace and optimize file weights.
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👁️ Editor
Markdown Previewer
Write Markdown with live GitHub-flavored preview rendering and clean HTML export.
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🎨 Design
CSS Gradient Generator
Build linear and radial CSS gradients with multi-color stops and one-click code copy.
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⏰ Time
Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and parse calendar dates to seconds.
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🗓️ Time
Cron Expression Parser
Explain cron schedule expressions in plain English and preview upcoming execution times.
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🏷️ Encoding
HTML Entity Encoder
Encode characters to HTML entities or decode named and numeric entities to plain text.
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🔢 Math
Number Base Converter
Convert numerical values between Binary, Octal, Decimal, and Hexadecimal representations.
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🐫 Code Style
Naming Converter
Convert identifier names between camelCase, snake_case, kebab-case, and PascalCase.
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💻 Code
Code Diff Checker
Compare two code snippets side-by-side to highlight additions, modifications, and line changes.
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🌈 Design
Color Converter
Convert color codes between HEX, RGB, HSL, and HSV with live interactive color swatches.
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🛡️ SECURE LOCAL EXECUTION

Safe Developer Utilities with Zero Data Transmission

Pasting sensitive JSON payloads, internal JWT authentication tokens, or proprietary code into online tools often exposes credentials to untrusted third-party logging. Every developer utility on ToolForGenZ operates strictly inside your browser environment.

No API keys, hashes, or payload data are transmitted over the network or saved in external caches.